THE SLIME MOLDS OF OHIO 
13 
R. Stalk brown. 
S. Sporangia globose. 
S. • Sporangia depressed globose. 
22. P. maydis 
23. P. auriscalpum 
R. Stalk yellow. 
T. Lime knots numerous. 
Y. Columella absent. 
24. P. tenerum 
24b. P. citrinum 
25. P. galbeum 
Y. Columella presept. 
T. Lime knots very small. 
R. Stalk white or gray. 
U. Lime knots large, angular, light colored. 
U. Lime knots small, spindle shaped, yellow. 
R. Stalk red. 
26. P. melleum 
27. P. viride 
28. P. flavicomum 
K. Sporangia red or brown. 
V. Lime knots brown. 
V. Lime knots red. 
29. P. murinum 
30. P. pulchripes 
K. Sporangia purple. 
31. P. pidcherrimum 
1. P. testaceum Sturgis. Sporangia clustered, subglobose, white, 
sessile, 0.7mm. in diam. Sporangium wall of two distinct layers, the 
outer a smooth white shell, separating from the membranous colorless 
inner layer. Capillitium of numerous angular and branching white lime 
knots of variable size connected by short hyaline threads. Spores purple, 
spinulose, darker and rougher on one side, 8 to lOmmm. in diam. 
(Ohio—Lister). 
2. P. bitectum Lister. Sporangia scattered, subglobose, or forming 
plasmodiocarps, smooth, light colored, sessile, 0. 7mm. in diam. Sporangium 
wall double, outer wall smooth, deciduous above, recurved and persistent. 
Capillitium of numerous white lime knots connected by hyaline threads. 
Spores purple brown, spinulose, darker and rougher on one side, 10 to 
12mmm. in diam. 
(Miami Valley—Morgan), (Ohio—Macbride). 
3. P. sinuosum (Bull.) Weinm. Sporangia scattered, elongated, much 
compressed laterally, sinuous, dehiscing along the upper ridge, gray, 
sometimes yellowish, sessile. Sporangium wall double; outer wall thick, 
fragile especially above; inner wall delicate, wrinkled, colorless. Capillitium 
of numerous white lime knots connected by hyaline threads. Spores violet 
brown, uniformly spinulose, 8 to lOmmm. in diam. 
Common. 
4. P. cinereum (Batsch) Pers. Sporangia gregarious or crowded, 
subglobose or plasmodiocarpus, cinereous, sessile, 0.4mm. in diam. Spor¬ 
angium wall single, membranous, containing clusters of white lime granules. 
Capillitium of numerous white variously shaped lime knots connected by 
hyaline threads. Spores violet brown, somewhat rough, 7 to 8mmm. in 
diam. 
Common. Occasionaly found on grass in lawns. 
