14 
OHIO BIOLOGICAL SURVEY 
5. P. vernum Somm. Sporangia subglobose or plasmodiocarpous, 0.5 
to 1mm. in diam., gray, sessile. Sporangium wall membranous generally 
containing much lime. Capillitium as in P. cinereum. Spores purple 
brown, spinulose, 9 to 12mmm. in diaim 
Erie Co. 
6. P. contexlum Pers. Sporangia subglobose or somewhat elongated, 
0.5mm. in diam., yellowish, sessile. Sporangia wall double, the outer thick 
containing much lime, the inner thin. Capillitium of large branching 
white lime knots connected by short hyaline threads. Spores violet brown, 
spinulose, 10 to ISmmm. in diam. 
Rather common. 
7. P. serpula Morgan. Sporangia crowded, subglobose or usually 
forming plasmodiocarps of various shapes as lines, circles, etc., 0.3mm. in 
diam., pale yellow, sessile. Sporangium wall single containing yellow 
lime granules. Capillitium of yellow angular lime knots connected by 
short hyaline threads. Spores purple brown, spinulose, 10 to 12mmm. in 
diam. 
Hocking Co. (Miami Valley—Morgan), (Ohio—Lister). 
8. P. virescens Ditm. Sporangia, crowded, subglobose, small, 0.3mm. 
in diam., yellowish, sessile. Sporangium wall membranous, thin containing 
yellow lime granules. Capillitium of irregular yellow lime knots connected 
by hyaline threads. Spores violet, minutely roughened, 7 to 9mmm. in 
diam. 
Summit Co. (Miami Valley—Morgan), (Ohio—Macbride). 
9. P. atrum Schwein. Sporangia clustered or heaped, small, dull violet 
brown, sessile. Sporangium wall membranous with little lime. Capillitium 
scanty, of small angular white lime knots connected by short hyaline 
threads. Spores violet brown, warted, 10 to 12mmm. in diam. 
(Miami Valley—Morgan). 
10. P. rubiginosum Fries. Sporangia gregarious, subglobose, 0.5 to 1mm. 
in diam., red or brown, sessile. Sporangium wall membranous, containing 
clusters of red or orange lime granules. Capillitium of large angular red 
lime knots connected by a dense network of hyaline threads. Spores violet 
brown, spinulose, 8 to llmmm. in diam. 
Lucas Co., (Miami Valley—Morgan), (Ohio—Macbride). 
11. P. lateritium (Berk. & Br.) Morg. Sporangia gregarious, subglobose 
or forming plasmodiocarps, 0.3 to 0.7mm. in diam., red or red brown, 
sessile. Sporangium wall rugulose, membranous, containing clusters of 
red or orange lime granules. Capillitium of rounded orange lime knots 
connected by delicate hyaline or yellowish threads. Spores violet brown, 
minutely roughened, 7 to 9mmm. in diam. 
Not rare in Ohio. 
