Pythiopsis humphreyana

Pythiopsis humphreyana Coker, Mycologia 6: 292. 1914
Vegetative growth long; hyphae slender, sparingly branched, 11-14// thick, stoutest in the neighborhood of reproductive bodies, and after maturity disorganizing rather quickly; sporangia spheric, oval, or pyriform, to elongate, tapering, and irregular, discharging by a short or long papilla, usually proliferating from below in a cymose manner; spores monoplanetic, pyriform, about 9 n in diameter when encysted; gemmae resembling the sporangia, abundant; oogonia generally borne like the sporangia and not to be distinguished from these when young, apical and often in cymosely branched groups, usually spheric with a basal neck, sometimes pyriform, rarely longer and more irregular, 33-89 /t in diameter, averaging about 43 ix, the wall always smooth, unpitted, about 1.4 x thick; eggs generally one, occasionally two, very rarely four, eccentric (Lund), 24—40 yu in diameter, averaging about 30 /i, with a wall about 2 fi thick, not nearly filling the oogonium as in P. cymosa; antheridia short-clavate, on stalks arising immediately below the oogonium as a rule, but sometimes of more distant origin, rarely diclinous, one, two, or rarely more to an oogonium, generally applied to its top or distal half; antheridial tube present.
Type locality: Chapel Hill, North Carolina. Habitat: Fresh water.
Distribution: North Carolina; also in Denmark.