THE SLIME MOLDS OF OHIO 
21 
7. LEOCARPUS Link. 
Leocarpus fragilis (Dickson) Rost. Plate III, Fig. 2, 2a, and 2b. 
Sporangia sessile or stalked. Sporangium wall without lime, double, 
the outer firm, smooth, and shining. Capillitium a rigid network of 
hyaline threads connecting large irregular branching lime knots. 
1. L. fragilis (Dicksoii) Rost. Sporangia gregarious, obovoid, yellowish 
brown, polished, stalked or sessile. Sporangium wall double. Columella 
absent. Stalk short, weak, yellowish, membranous. Capillitium of large 
branching brown lime knots connected by a network of rigid hyaline 
threads. Spores dark brown, spinulose, 11 to 14mmm. in diam. 
Rather common on leaves, twigs, old grape vines etc. 
8. DIDERMA Persoon. 
Diderma effusum (Schwein.) Morg. Plate III, Fig. 4. 
Diderma globosam Pers. Plate III, Fig. 5 and 5a. 
Diderma floriforme (Bull.) Pers. Plate III, Fig. 6. 
Diderma testaceum (Schrad.) Pers. Plate III, Fig. 3. 
Sporangia stalked or sessile, sometimes plasmodiocarpous. Sporangium 
wall double, the outer wall crustaceous, either calcareous or cartilaginous. 
Lime in the form of globular non crystaline granules. Capillitium of 
delicate threads, without lime. 
A. Outer sporangium wall calcareous. 
B. Sporangia plasmodiocarpous. 
B. Sporangia distinct. 
C. Sporangia white. 
D. Sporangia sessile. 
E. Outer wall very fragile; not wholly 
separate from inner wall. 
E. Outer wall firm, egg shell like, wholly 
separate from the inner wall. 
D. Sporangia stalked. 
C. Sporangia pale pink, bleaching with age. 
A. Outer sporangium wall cartilaginous. 
F. Spores with scattered warts. 
F. Spores minutely roughened. 
1. D. effusum 
2. D. spumarioides 
3. D. globosum 
4. D. hemisphericum 
5. D. testaceum 
6. D. floriforme 
7. D. radiatum 
1. D. effusum (Schwein.) Morgan. Sporangia gregarious, much 
depressed, circular or usually forming net like and effused flat plasmodio- 
carps. Sporangium wall double, the outer a delicate white crust of lime 
granules separated from the membranous colorless inner wall. Columella 
depressed, flesh colored. Capillitium of delicate anastomosing threads. 
Spores violet brown, nearly smooth, 6 to S.mmm. in diam. 
Common. 
2. D. spumarioides Fries. Sporangia crowded, globose, about 0.5 to 
0.8mm. in diam., white, sessile. Sporangium wall double, the outer thick 
but very fragile, adhering slightly to the membranous inner wall. Colum- 
