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Obelidium megarhizum Willoughby Trans. Brit. Mycol. Soc. 44:586–592, fig. 1, Pl. 37. 1961
Saprobic; termite wings; submerged mud; Malham Tarn, U.K.

ODONTOCHYTRIUM Vélez and Letcher [Chytridiales, Chytriomycetaceae] MB#801483; Mycologia 105:1251–1265. 2013

Odontochytrium milleri Vélez and Letcher MB#801484. Mycologia 105:1251–1265. 2013
Saprobic; widespread on pollen and chitin baits; aquatic; type from TIERRA DEL FUEGO, ARGENTINA

OEDOGONIOMYCETACEAE D.J.S. Barr [Monoblepharidales, Monoblepharidomycetes; HP, p. 463, 1990

Oedogoniomyces from Harpochytriales to Monoblepharidales; D.J.S. Barr: HP, p. 463, 1990

Olpidium (Braun) Rabenhorst 1868 = Pleotrachelus Zopf 1884; Karling: CI, p. 14. 1977. D.J.S. Barr placed Olpidium in Spizellomycetales; Canad. J. Bot. 58:2380–2394. 1980
Molecular phylogenies indicate that Olpidium is outside of the Chytridiomycota, see James et al. 2006

Olpidium appendiculatum Karling; Sydowia, 19:213–226, Pl. 46, figs. 1–13. 1965;
Saprobic; pollen; sand & moss; near glacier, ANARCTICA

Olpidium bornovanus (Sahtiyanci) Karling; CI, p. 13. 1977
Ξ Pleotrachelus bornovanus Sahtiyanci 1962
O. radicale; Lange & Insunza; Trans. Brit. Mycol. Soc. 69:377–384. 1977;
O. cucurbitacearum Barr & Dias; Campbell & Sim; Canad. J. Bot. 72:1136–1143. 1994

Olpidium brassicae (Woronin) Dangeard Ξ Pleotrachelus brassicae (Woronin) Sahtiyanci; Arch. Mikrobiol. 41:187–228. 1962

Olpidium cucurbitacearum D.J.S. Barr and Dias; Canad. J. Bot. 46:1087–1091, figs. 1–12 & 13–22. 1968
Parasitic; cucumber roots; soil; southern ONTARIO, CANADA
Olpidium radicale 1977 as redescribed, Lange & Insunza; Trans. Brit. Mycol. Soc. 69:377–384. 1977

Olpidium entophlyctoides in S.N. Dasgupta; Indian Phytopathol. 35:215. 1982; nomen nudum

Olpidium fulgens (Zopf) Karling; CI, p. 18. 1977 Ξ Pleotrachelus fulgens Zopf 1892

Olpidium incognitum S.N. Dasgupta & R. John; Bull. Bot. Surv. India 30:1–82, figs. 5–6. 1988
Parasitic; egg of rotifer; tank sediment; Lucknow U., INDIA

Olpidium indicum Karling (homonym); Sydowia 17:302–307, figs. 1–21. 1964
Parasitic; Catenophlyctis variabilis & Rhizophlyctis fuscus; soil; Rhamnad Dist., INDIA;
Ξ Olpidium indum Karling 1966

Olpidium indicum Kiran & Dyal (homonym & type not indicated); Proc. Natl. Acad. Sci, India, Sect. B. 62:295–298, fig. 2. 1992
Parasitic; root hairs of angiosperms; Pond; Ramkatora, Varanasi, U.P., INDIA

Olpidium indum Karling; Sydowia, Beiheft VI, p.6. 1966 Ξ Olpidium indicum Karling 1964

Olpidium longum S.N. Dasgupta & R. John; Bull. Bot. Surv. India 30:1–82, figs. 2–4. 1988;
Parasitic; eggs of animicules; tank sediment; Lucknow U., INDIA

Olpidium nematodae Skvortzow; (Tribe refutes Sparrow 1960 interpretation) Tribe; Trans. Brit. Mycol. Soc. 69:509–511. 1977

Olpidium paradoxum S.L. Glocking; Mycol. Res. 102:206–208. 1998;
parasitic and saprobic; loricate rotifers; pond water; Ibaraki, JAPAN; unlikely to be an Olpidium (see fig.8).

Olpidium poreferum Kiran and Dyal (invalid; type not designated) Proc. Natl. Acad. Sci., India, Sect. B. 62:295–298, Pl. 1, fig. 1. 1992;
Parasitic; rotifers; Pond, Ag. Farm; B.H.U., U.P., INDIA

Olpidium pseudoeuglenae S.N. Dasgupta & R. John; Bull. Bot. Surv. India 30:1–82, fig. 7. 1988
Parasitic; chytrid on Closterium; tank sediment; Lucknow U., INDIA

Olpidium radicale Schwartz & Cook; redescribed by Lange & Insunza; Trans. Brit. Mycol. Soc. 69:377–384. 1977
O. cucurbitacearum D.J.S. Barr and Diaz 1968;
Pleotrachelus bornovanus Sahtiyanci 1962. Olpidium radicale not accepted by Campbell & Sim; Canad. J. Bot. 72:1136–1143. 1994; Campbell & Sim consider O. radicale a nomen dubium and accept O. bornovanus.

Olpidium rostriferum var. indica Kiran & Dayal (invalid; type not designated) Proc. Natl. Acad. Sci., India, Sect. B. 62:295–298, fig. 3. 1992
Saprobic; leaf of angiosperm; pond; Ramkatora, U.P., INDIA

Olpidium sparrowii I.J. Dogma; Philipp. J. Biol. 6:9–20, figs. 1–16. 1977; table of Olpidium spp. parasitic on rotifers;
Parasitic; rotifer eggs; cultivated soils; Putiao, Luzon, PHILIPPINES

Olpidium synchytrii Karling; Mycologia 50:944–947, figs. 1–7. 1958
Parasitic; Synchytrium namae on Nama jamaicensis plants; TEXAS, USA

Olpidium vermicola G.L. Barron & E. Szijarto; Mycologia 78:972–975, figs. 1–12. 1986
Parasitic; nematode eggs; old stump; Lake Manitowabing, ONTARIO, CANADA

Olpidium virulentus (Sahtiyanci) Karling; CI, p. 13, 1977 Ξ Pleotrachelus virulentus Sahtiyanci 1962

Olpidium wildemani (Petersen) Karling; CI, p. 18, 1977 Ξ Pleotrachelus wildemani Petersen 1910

Olpidium zopfianus (Morini) Karling; CI, p. 18, 1977 Ξ Pleotrachelus zopfianus Morini 1913

OONTOMYCES  Dagar, Puniya & G.W. Griff.;   IF550795 [Neocallimastigomycota, Neocallimastigales] Fungal Biology 119:731–737. 2015

Oontomyces anksri Dagar, Puniya & G.W. Griff.; IF550796. Fungal Biology 119:731–737. 2015
Obligate anaerobic fungus, isolated from camel forestomach from  ICAR National Research Centre for Camels (Bikaner, Thar Desert, Rajasthan, INDIA

OPERCULOMYCES M.J. Powell, Letcher, & Longcore [Rhizophydiales] MB#519309. Mycologia, 103:854–862. 2011

Operculomyces laminatus M.J. Powell, Letcher & Longcore. MB#519310.Mycologia, 103:854–862. 2011
Saprobic; garden soil baited with keratin; Orono (Penobscot County), MAINE, USA

ORPINOMYCES D.J.S. Barr & H. Kudo [Neocallimastigales]; Canad. J. Bot. 67:2815–2824. 1989;
Emended by Y.W. Ho & D.J.S. Barr; Mycologia 87:656–678. 1995

Orpinomyces bovis D.J.S. Barr & H. Kudo; Canad. J. Bot. 67:2815–2824. figs. 37–51. 1989
Saprobic; plant material; digestive tract of herbivores; Lethbridge, ALBERTA, CANADA
Orpinomyces joyonii (Breton et al.) Li et al. 1991

Orpinomyces intercalaris Y.W. Ho; Mycotaxon 50:139–150, figs. 1–10. 1994;
Saprobic; guinea grass (Panicum maximum); rumen of cattle (Bos indicus); MALAYSIA

Orpinomyces joyonii (Breton et al.) Li et al.; Canad. J. Bot. 69:580–589. 1991; = O. bovis Barr & H. Kudo 1989; ? Neocallimastix joyonii Breton et al. 1989; Lectotype: see Y.W. Ho & D.J.S. Barr; Mycologia 87:656–678. 1995


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PALUDOMYCES Letcher & M.J. Powell, gen. nov. [Chytridiomycota, Halomycetaceae] MB#811465. Letcher et al. Mycologia 107:808–830. 2015

Paludomyces mangrovei (Ulken) Letcher & M.J. Powell, comb. nov. MB#811466130.
Ξ Phlyctochytrium mangrovei Ulken, Veroff. Inst. Meeresforsch. Bremerhaven 13:227. 1972.
Letcher et al. Mycologia 107:808–830. 2015

PARAMICROSPORIDIUM Corsaro et al. [Cryptomycota (Rozellomycota)] MB#807391. Parasitol Res 113:1909–1918. 2014

Paramicrosporidium saccamoebae Corsaro et al. MB#807392. Parasitol Res 113:1909–1918. 2014

parasitic, Saccamoeba sp., freshwater pond, GERMANY

Paramicrosporidium vannellae Corsaro et al. MB#807393. Parasitol Res 113:1909–1918. 2014

parasitic, Vannella sp., keratitis patient, GERMANY

PARANOMYCES Letcher & M.J. Powell [Rhizophydiales, Halomycetaceae] MB#811469 Mycologia, 107:808–830. 2015

Paranamyces uniporus Letcher & M.J. Powell, MB#811470. Mycologia, 107:808–830. 2015. Saprobic; pollen, estuarine mud flat, Delta del Parana´, BUENOS AIRES PROV, ARGENTINA
HOLOTYPE = FIG. 4E in Letcher et al. Mycologia 107:808–830. 2015.

Paraphelidium tribonemae Karpov, Moreira & Lopez-Garcia [Phylum Aphelida Karpov, Aleoshin & Mikhailov 2014; Class Aphelidea Gromov 2000; Order Aphelidida Gromov 2000, Family Aphelididae Gromov 2000] Journal of Eukaryotic Microbiology (in press) 2016.
Parasitic, Tribonema gayanum, roadside ditches, Novgorod district, RUSSIA

PATERAMYCETACEAE MB#MB 511776. [Rhizophydiales] Mycological Research 112:759–782. 2008

PATERAMYCES Letcher [Rhizophydiale, Pateramycetaceae] Mycological Research 112:759–782. 2008

Pateramyces corrientinensis Letcher Mycological Research 112:759–782. 2008
saprobic, pollen bait, small lake, Museo Argentino de Ciencias Naturales, ARGENTINA

PECORAMYCES Radwa Hanafy, Noha Youssef, G.W. Griff. & Mostafa Elshahed., [Neocallimastigales].; Index Fungorum registration: IF552530; Mycologia 109:231–243. 2017

Pecoramyces ruminatium RadwaHanafy, Noha Youssef, G.W. Griff. &Mostafa Elshahed; Index Fungorum registration: IF552531. Mycologia 109:231–243. 2017. Feces of an Angus steer; Stillwater, OKLAHOMA, USA

PENDULICHYTRIUM K. Seto & Y. Degawa MB#821132 [Chytridiales, Chytriomycetaceae] Mycoscience https://doi.org/10.1016/j.myc.2017.08.004.  2017

Pendulichytrium sphaericum K. Seto & Y. Degawa MB#821171. Mycoscience https://doi.org/10.1016/j.myc.2017.08.004.  2017

PEREXIFLASCA Krings, C.J. Harper & E.L. Taylor MB#819876. Geobios 56:107–114. 2019. 
Fossil, possible Chytridiomycota

Perexiflasca tayloriana M. Krings, C.J. Harper & E.L. Taylor, 2017, emend. MB#819877, Geobios 56:107–114. 2019. Fossil.

Perexiflasca ventricosa M. Krings et C.J. Harper MB#830621. Geobios 56:107–114. 2019. Fossil.

Phlyctidium (Braun) Rabenhorst 1868 = Rhizophydium Schenk 1858; Karling: CI, Pp. 64–65. 1977

Phlyctidium anatropum (Braun) Rabenhorst 1856 Ξ Rhizophydium anatropum (Braun) Karling; CI, p. 65. 1977

Phlyctidium apophysatum Canter 1947 emended by H. Canter; Trans. Brit. Mycol. Soc. 44:522–528, figs. 1–3 & Pl. 34, figs.1–10. 1961;
Parasitic; Mougeotia; E.L.D., U.K. Ξ Canteria apophysata (Canter) Karling 1971

Phlyctidium brevipes var. marinum Kobayasi & Ookubo 1954
Ξ Rhizophydium brevipes var. marinum (Kobayasi & Ookubo) Karling; CI, p. 65, 1977

Phlyctidium bumilleriae Couch 1932 Ξ Rhizophydium bumilleriae (Couch) Karling; CI, p. 65. 1977

Phlyctidium globosum Skuja 1956 Ξ Rhizophydium skujai (Skuja) Karling; CI, p. 64. 1977

Phlyctidium keratinophilum Ookubo and Kobayasi 1955
Ξ Rhizophydium ellipsoidium (Ookubo & Kobayasi) Karling; CI, p. 64. 1977

Phlyctidium keratinophilum var. savulescui Cejp; Omagiu lui Traian Savulescu (Bucuresti), 129–138, fig. 1. 1959;
Saprobic; human hair; rill; pasture near Rokycany, ROMANIA

Phlyctidium marinum Karling; Sydowia 20:74–84, Pl. XII, figs. 1–8. 1967;
Saprobic; Pinus pollen; beach sand + sea water; Aukland, NEW ZEALAND
Ξ Rhizophydium novae-zelandiensis (Karling) Karling; CI, p. 65. 1977

Phlyctidium mycetophagum Karling 1946 Ξ Rhizophydium obypriformis (Karling) Karling; CI, p. 64. 1977

Phlyctidium olla Sparrow 1933 Ξ Rhizophydium olla (Sparrow) Karling; CI, p. 65. 1977

Phlyctidium scenedesmi Fott; Z. Allg. Mikrobiol. 7:97–102, figs. 1–16. 1967;
Parasitic; Scenedesmus quadricauda in mass culture; water; Trebon, CZECHOSLOVAKIA;
Ξ Rhizophydium scenedesmi (Fott) Karling; CI, p. 65. 1977

Phlyctidium spinulosum Sparrow 1933 Ξ Rhizophydium spinulosum (Sparrow) Karling; CI, p. 65. 1977

Phlyctidium tenue Sparrow 1952 Ξ Rhizophydium tenue (Sparrow) Karling; CI, p. 65. 1977

Phlyctidium tubulatum in S.N. Dasgupta; Indian Phytopathol. 35:215. 1982; nomen nudum

Phlyctochytrium acuminatum D.J.S. Barr; Canad. J. Bot. 47:991–997, figs. 71–82. 1969;
Saprobic; pine pollen; soil; southwestern Ontario, Canada; Ξ Spizellomyces acuminatus (D.J.S. Barr) D.J.S. Barr 1984

Phlyctochytrium aestuarii Ulken; Veröff. Inst. Meeresforsch. Bremerhaven 13:205–216, figs. 5 & 6. 1972;
Saprobic; pine pollen; river mud, Weser Estuary; GERMANY

Phlyctochytrium africanum Gaertner 1954 (not validly published)
Spizellomyces acuminatus (D.J.S. Barr) D.J.S. Barr; Canad. J. Bot. 62:1171–1201. 1984

Phlyctochytrium apophysatum S.N. Dasgupta & R. John; Bull. Bot. Surv. India 30:1–82, fig. 36. 1988;
Saprobic ?; Closterium; tank, garden; Lucknow U., INDIA

Phlyctochytrium arcticum D.J.S. Barr; Canad. J. Bot., 48:2279–2283, figs.1–17. 1970
Saprobic; pollen; soil, pH 7.9; Canadian Arctic; Ξ Triparticalcar arcticum D.J.S. Barr 1984

Phlyctochytrium aureliae 1945 Ajello = Phlyctochytrium variable 1954; T.W. Johnson; Norw. J. Bot. 22:249–257. 1975

Phlyctochytrium californicum D.J.S. Barr; Canad. J. Bot. 47:991–997, figs. 23–33. 1969
Saprobic; pine pollen; soil; CALIFORNIA, USA. = Gaertneriomyces semiglobiferum (Uebelmesser) Barr 1980. Ξ Gaertneriomyces californicus (D.J.S. Barr) M.J. Powell & Letcher; Nova Hedwigia 2017 (in press)

Phlyctochytrium chandleri Sparrow; Arch. Microbiol. 104:39–49, figs. 6–9. 1975
Saprobic; pollen; soil; oasis, TUNISIA

Phlyctochytrium circulidentatum Koch Mycologia 61:1021–1030, figs. 1–3, 11–17. 1969;
Saprobic; pollen and moribund Closterium; bottom debris; Ravenal Lake, NORTH CAROLINA, USA

Phlyctochytrium cystoferum Willoughby; Arch. Mikrobiol. 52:01–131, fig. 1 a–h. 1965
Saprobic; grass leaf bait; soil from heath; Victoria, AUSTRALIA;
Ξ Polyphlyctis cystofera (Willoughby) A. Batko; ZH, p. 183. 1975

Phlyctochytrium dichotomum Umphlett; Mycologia, 59:1085–1096, figs. 1–41. 1967
Saprobic; sweet gum pollen; soil + sawdust; Chatham Co., NORTH CAROLINA, USA
Ξ Kochiomyces dichotomus (Umphlett) D.J.S. Barr 1980

Phlyctochytrium dissolutum S.N. Dasgupta & R. John; Bull. Bot. Surv. India 30:1–82, fig. 37. 1988;
Saprobic ?; Closterium; tank, garden; Lucknow U., INDIA

Phlyctochytrium furcatum Sparrow; Arch. Mikrobiol. 53:178–180, figs. 1–9. 1966
Saprobic; pine pollen; almost dry bog with Vaccinium; MICHIGAN, USA

Phlyctochytrium hirsutum Karling; Sydowia 20:86–95, figs. 3–10. 1967;
Saprobic; purified shrimp chitin; soil; NEW ZEALAND

Phlyctochytrium incrustans Sparrow & Lange; Canad. J. Bot. 55:1879–1890, figs. 19–22. 1977
Saprobic; pine pollen; bog; Emmet Co., MICHIGAN, USA

Phlyctochytrium indicum Karling; Sydowia 17:285–296, figs. 16–31. 1964;
Saprobic; pine pollen; brackish soil; Rhamnad Dist., Madras, INDIA

Phlyctochytrium irregulare Koch; J. Elisha Mitchell. Sci. Soc. 73:108–122, figs. 13–24. 1957
Saprobic; Liquidambar pollen and Paspalum leaves bait; wet soils; NORTH CAROLINA, USA

Phlyctochytrium kniepii Gaertner 1954 (not validly published)
Ξ Spizellomyces kniepii Gaertner ex D.J.S. Barr; Canad. J. Bot. 62:1171–1201. 1984

Phlyctochytrium lackeyi Sparrow; Mycologia 68:1233–1234, figs. 1–4. 1976
Saprobic; pollen; Punch Bowl; Milford, FLORIDA, USA

Phlyctochytrium macrosporum Sparrow; Mycologia 70:40–149, figs. 1–14. 1978
Parasitic?; live pine pollen; neuston; Newnan’s Lake, FLLORIDA, USA

Phlyctochytrium mangrovii Ulken; Veröff. Inst. Meeresforsch. Bremerhaven 13:217–230, figs. 1,2. 1972
Saprobic; pine pollen and cattle hair; mangrove muds; Cananeia, SAO PAULO, BRAZIL

Phlyctochytrium marilandicum Sparrow; Mycologia 65:1331–1336, figs. 1–11. 1973
Saprobic; pollen; woodland soil; MARYLAND, USA

Phlyctochytrium megastomum Karling; Mycopathol. Mycol. Appl. 36:165–178, figs. 1–17. 1968
Saprobic; bleached corn leaves; soil; Rarotonga, COOK ISLANDS.
P. irregularis Koch 1957 (Sparrow opinion, unpublished)

Phlyctochytrium mucosum Sparrow & I.J. Dogma; Arch. Mikrobiol. 89:177–204, fig. 1, J–M. 1973
Saprobic; pine pollen bait; soil; DOMINICAN REPUBLIC

Phlyctochytrium multidentatum Umphlett; Mycologia 61:1021–1030, figs.4–10. 1969
Saprobic; sweet gum pollen; “soil & water” Chapel Hill, NORTH CAROLINA, USA

Phlyctochytrium neuhausiae Sparrow; Proc. Iowa Acad. Sci. 81:2–5, figs. 10–14. 1974
Saprobic; pine pollen; soil; Delphi, GREECE

Phlyctochytrium palustre Gaertner 1954 (not validly published)
Spizellomyces palustris Gaertner ex D.J.S. Barr; Canad. J. Bot.62:1171–1201. 1984

Phlyctochytrium parasitans Sparrow & I.J. Dogma; Arch. Mikrobiol. 89:177–204, fig. 2, T–U. 1973
Parasitic; Achlya flagellata eggs; damp soil; Carretara Duarte, HISPANIOLA

Phlyctochytrium peruvianum Knox (not validly published) PhD thesis, VPI, Blacksburg, VA. 1970
Spizellomyces punctatus (Koch) D.J.S. Barr 1984

Phlyctochytrium planicorne Atkinson 1909 emended by Umphlett & Holland; Mycologia 52:429–435. 1960
Rhizophydium digitatum Scherffel 1926; T.W. Johnson: Norw. J. Bot. 22:249–257. 1975
See: P.M. Letcher and M.J. Powell, 2005. Phylogenetic position of Phlyctochytrium planicorne [Chytridiomycota, Chytridiales] based on zoospore ultrastructure and partial nuclear LSU rRNA gene sequence analysis. Nova Hedwigia 80:135–146

Phlyctochytrium plurigibbosum D.J.S. Barr; Canad. J. Bot. 47:991–997, figs. 44–52. 1969
Saprobic; pine pollen; soil; Ottawa, ONTARIO, CANADA
Ξ Spizellomyces plurigibbosus (D.J.S. Barr) D.J.S. Barr 1984

Phlyctochytrium powhatanense Roane; Mycologia 65:531–538, figs. 1–2, 15–20. 1973
Saprobic; rotifer, chitin, snake skin; impoundment; Pulaski Co., VIRGINIA, USA

Phlyctochytrium punctatum Koch; J. Elisha Mitchell. Sci. Soc. 73:108–122, figs. 1–16. 1957
Saprobic; Liquidambar and pine pollen bait; soil; NEW GUINEA; Ξ Spizellomyces punctatus (Koch) Barr 1984

Phlyctochytrium recurvastomum Knox & Paterson; Mycologia 65:373–387, figs. 11–18. 1973
Saprobic; pollen; soil; McMurdo area, ANTARCTICA

Phlyctochytrium rhizopenicillium Knox (not valid pub.) PhD thesis, VPI, Blacksburg, VIRGINIA. 1970

Phlyctochytrium semiglobiferum Uebelmesser 1956
Ξ Gaertneriomyces semiglobiferus (Uebel.) D.J.S. Barr; Canad. J. Bot. 58:2380–2394. 1980

Phlyctochytrium spinosum Sparrow; Mycologia 65:1331–1336, figs. 12–16. 1973;
Saprobic; pollen ?; soil from spring-fed meadow; HawaiI, USA

Phlyctochytrium variable Rieth 1954; = Phlyctochytrium aureliae Ajello 1945; T.W. Johnson; Norw. J. Bot. 22:249–257

Phlyctochytrium vaucheriae Rieth 1956; Ξ Blyttiomyces vaucheriae (Rieth) I.J. Dogma; Mycologia 61:1149–1158. 1969

Phlyctochytrium verruculosum Knox (not valid pub.) PhD thesis, VPI, Blacksburg, VIRGINIA. 1970
Spizellomyces punctatus (Koch) D.J.S. Barr ; Canad. J. Bot. 58:2380–2394. 1980

Phlyctorhiza variabilis Karling 1947
Ξ Entophlyctis variabilis (Karling) Cejp; Omagiu lui Traian S?vulescu 129–138. 1959
Ξ Catenophlyctis variabilis (Karling) Karling; Amer. J. Bot. 52:133–138. 1965

Physodermataceae Transferred from Chytridiales to Blastocladiales; Lange & Olson: Trans. Brit. Mycol. Soc. 74:449–457. 1980

PIROMYCES Gold, Heath & Bouchop; Biosystems 21:403–415. 1988; in Neocallimastigales
Piromonas communis sensu Orpin, 1977

Piromyces communis Gold, Heath & Bauchop; BioSystems 21:403–415, (figs. 1–10 in Orpin 1977). 1988
Saprophytic; plant material; rumen of sheep. Ξ Piromonas communis Liebetanz sensu Orpin 1977

Piromyces dumbonicus J. Li; Canad. J. Bot. 68:1021–1033, figs. 2,4,9,12,13,19,23,24,31. 1990
Saprobic; cellulosic; gut of elephant; NEW ZEALAND

Piromyces finnis O’Malley, Haitjema & Gilmore. Fungal Diversity 78:187–193, 2016.  MB#551677. Feces of horse, Concord, MASSACHUSETTS, USA

Piromyces mae J. Li; Canad. J. Bot. 68:1021–1033, figs. 1, 3, 5–8, 10, 11, 15–16, 20–22, 25–30, 32. 1990
Saprobic; plant material; caecum of horse, NEW ZEALAND

Piromyces minutus Y.W. Ho; Mycotaxon 47:285–293, figs. 1–14. 1993
Saprobic; guinea grass (Panicum maximum); rumen of Sika deer (Cervus nippon); MALAYSIA

Piromyces rhizinflatus Breton et al.; FEMS Microbiol. Lett. 82:1–8, figs. 1–2. 1991
Saprobic; culture; dried faeces of Saharian ass; TUNISIA
Lectotype: see Y.W. Ho & D.J.S. Barr; Mycologia 87:656–678. 1995

Piromyces spiralis Y.W. Ho; Mycotaxon 48:59–68, figs. 1–14. 1993
Saprobic; guinea grass (Panicum maximum); rumen of katjang goat (Capra hircus); MALAYSIA

Pleotrachelus Zopf 1884 Synonym of Olpidium (Braun) Rabenhorst 1868; Karling, CI, p. 14. 1977

Pleotrachelus askaulos Bradley; Amer. J. Bot. 54:577–582, fig. 8. 1967
Fossil; Eocene Green River Formation; WYOMING, USA

Pleotrachelus bornovanus Sahtiyanci; Arch. Mikrobiol. 41:187–228, figs. 50–79. 1962;
Parasitic; Lactuca, Spinacea, Beta, Nicotiana, Solanum et al.; soil;
Ξ Olpidium bornovanus (Sahtiyanci) Karling; CI, p. 13. 1977;
O. radicale (sensu Lange & Insunza 1977);
O. cucurbitacearum D.J.S. Barr & Dias 1968. See Campbell & Sim; Canad. J. Bot. 72:1136–1143. 1994

Pleotrachelus brassicae (Woronin) Sahtiyanci; Arch. Mikrobiol. 41:187–228. 1962
Ξ Olpidium brassicae (Wor.) Dangeard; maintained as O. brassicae by Karling; CI, p. 18. 1977

Pleotrachelus virulentus Sahtiyanci; Arch. Mikrobiol. 41:187–228, figs. 24–49. 1962
Parasitic; Lactuca, Solanum, Beta, Nicotiana, Capsella; Ξ Olpidium virulentus (Sahtiyanci) Karling; CI, p. 13. 1977

Pleotrachelus wildemanni Petersen 1910 Ξ Olpidium wildemanni (Petersen) Karling; CI, p. 18. 1977

Pleotrachelus zopfianus Morini 1913 Ξ Olpidium zopfianus (Morini) Karling; CI p. 18. 1977

Podochytrium chitinophilum Willoughby; Trans. Brit. Mycol. Soc. 44:586–592, fig. 2, Pl. 38. 1961
Saprobic; termite wings; Wastwater, E.L.D., UNITED KINGDOM

Podochytrium dentatum Longcore; Mycologia 84:183–192, figs. 1–29. 1992;
Saprobic; chitin; lake, circumneutral pH; MAINE, USA

Podochytrium ellerbeckense Willoughby; Nova Hedwigia 5:335–340, Pl. 53 a–w. 1963
Saprobic; waterlily leaf stalks; garden pond; E.L.D., UNITED KINGDOM

POLYCARYUM Stempell [Blastocladiomycota, Blastocladiales] Zoologische. Abteilung fu¨ r Systematik, Geographie und Biologie der Tiere 15:591–596 plus Tafel 31. 1902

Polycaryum branchipodianum Stempell, 1902. Zoologische. Abteilung fu¨ r Systematik, Geographie und Biologie der Tiere, 15:591–596 plus Tafel, 31. 1902. Parasite; fairy shrimp (Branchipus grubei; Branchiopoda, Anostraca). Johnson et al. in Freshwater Biology 51:634–648. 2006 designated Figs 1–8 [Stempell, 1902 Zoologische Jahrbucher. Abteilung fu¨ r Systematik, Geographie und Biologie der Tiere 15: Tafel (Plate) 31, Figs 1–8] lectotype for P. branchipodianum and placed it in the Blastocladiales. P. branchipodianum is the type species for genus Polycaryum.

Polycaryum laeve Stempell 1903; Archives for Protistenkunde 2:349–363; 1903.Johnson et al.in Freshwater Biology51:634–648 designated Stempell’s figures [1903, Archiv fu¨ r Protistenkunde, 2: Tafel (Plate) IX, Figs 1–27] as lectotype and a collection from Allequash Lake WISCONSIN, USA 26 June 2003 as epitype (New York Botanical Garden as 00705250).

POLYPHAGALES Doweld (Chytridiomycetes) Index Fungorum 90:1 (2014); described from literature without molecular support. Molecular support by Karpov et al.  М И К О Л О Г И Я И Ф И Т О П А Т О Л О Г И Я 6: В ы п. 6 (2016).

Polyphagus asymmetricus Valkanov (no Latin diagnosis); Arch. Protistenk. 106:565–568, Pl. 44. 1963
Parasitic; Botrydiopsis; hyponeuston, southern BULGARIA

Polyphagus elegans Canter; Nova Hedwigia 5:419–428, Pls. 74–76. 1963
Parasitic; Ulothrix mucosum; plankton; Windermere, E.L.D., UNITED KINGDOM

Polyphagus euglenae Nowakowski, For TEM of zoospores see M.J. Powell; Can. J. Bot. 59:2049–2061. 1981

Polyphagus hyponeustonica (Valkanov) Karling; CI, p. 174. 1977 (sp. not validated)
Ξ Arnaudovia hyponeustonica Valkanov 1963 (no Latin diagnosis)

Polyphagus serpentinus Canter; Nova Hedwigia 5:419–428, Pls. 71–73. 1963
Parasitic; Spondylosium spp.; lakes; E.L.D., UNITED KINGDOM

Polyphagus starrii Johns; Mycologia 56:441–451, figs. 1–6, 1964
Parasitic; Eudorina, Pandorina, et al.; Stonewall Pond, MASSACHUSETTS, USA

POLYPHLYCTIS Karling [Chytridiales]. Sydowia 20:86–95. 1967

Polyphlyctis cystofera (Willoughby) A. Batko; ZH, p. 183. 1975; Ξ Phlyctochytrium cystoferum Willoughby 1965

Polyphlyctis unispina (Paterson) Karling; Sydowia, 20:86–95. 1967 Ξ Phlyctochytrium unispinum Paterson 1956

Polyphlyctis willoughbyi Letcher [Chytridiales, Chytridiaceae] MB#825370; Fungal Biology 122:1171-1183. 2018
Saprobic, onionskin bait, Clyde River mud, Conjola, Morton National Park, New South Wales, AUSTRALIA 

POWELLOMYCES Longcore, D.J.S. Barr & Désaulniers [Spizellomycetales]; Canad. J. Bot. 73:1385–1390. 1995

Powellomyces hirtus Longcore, D.J.S. Barr & Désaulniers; Canad J. Bot. 73:1385–1390, figs. 1–18. 1995
Saprobic; pollen bait; soil; ONTARIO, CANADA

Powellomyces variabilis Powell & Koch ex Longcore, D.J.S. Barr & N. Désaulniers; Canad. J. Bot. 73:1385–1390. 1995;
Ξ Entophlyctis variabilis sensu Powell & Koch 1977;
Ξ Geranomyces variabilis (Longcore et al.) D.R. Simmons [Spizellomycetales, Powellomycetaceae] in Mycologia 103:1411–1420. 2011 ; not E. variabilis (Karling) Cejp 1959

Pringsheimiella dioica Couch 1939 (homonym and no Latin diagnosis)
Ξ Dictyomorpha dioica Couch ex Mullins; Amer. J. Bot. 48:377–387. 1961

PROTRUDOMYCETACEAE Letcher [Rhizophydiales]. Mycological Research 112:759–782. 2008

PROTRUDOMYCES Letcher [Rhizophydiales, Protrudomycetaceae] Mycological Research 112:759–782. 2008

Protrudomyces laterale (A. Braun) Letcher. Mycological Research 112:759–782. 2008
Ξ Chtridium laterale A. Braun 1855. Ξ Rhizophydium laterale (A.Braun) Rabenh. 1868
= Rhizophydium karlingii Sparrow 1960. Letcher (2008) Epitype=GenBank LSU rDNA sequence EF585628, ITS1-5.8S-ITS2 rDNA sequence EF585668, Culture (ARG 071) in ATCCand CBS

PSEUDOPILEUM Canter [Chytridiales]; Trans. Brit. Mycol. Soc. 46:305–320. 1963

Pseudopileum unum Canter; Trans. Brit. Mycol. Soc. 46:305–320, fig. 3. 1963
Parasitic; cysts of Mallomonas sp.; plankton of Elterwater; E.L.D., UNITED KINGDOM