THE SLIME MOLDS OF OHIO 
41 
C. Dehiscence of sporangia regular. 
C. Dehiscence of sporangia irregular. 
B. Sporangia sessile, heaped. 
2. Perichaena 
3. Ophiotheca 
4. Lachnobulus 
1. ARCYRIA Wiggers. 
Arcyria cinerea (Bull.) Pers. Plate VII, Fig. 2. 
Arcyria nutans (Bull.) Grev. Plate VII, Figs. 1, la, lb, and Ic. 
Sporangia ovoid or cylindrical, stalked. Sporangium wall evanescent 
above, persistent below as a cup. Capillitium an elastic network with the 
threads variously marked, but not with spiral bands. 
A. 
A. 
Mature capillitium greatly expanded and drooping. 
Mature capillitium not greatly expanded. 
B. Sporangia red or brown. 
C. Capillitium free from the cup. 
D. Spores 10 to llmmm. in diam. 
D. Spores 6 to 8mmm. in diam. 
C. Capillitium attached to the cup. 
B. Sporangia yellow, very small. 
B. Sporangia gray or white. 
E. Sporangia cylindrical. 
F. Sporangia single. 
F. Sporangia combined in clusters. 
E. Sporangia globose. 
1. A. nutans 
2. A. ferruginea 
3. A. incarnata 
4. A. denudata 
5. A. pomiformis 
6. A. cinerea 
7. A. digitata 
8. A. globosa 
1. A. nutans (Bull.) Grev. Sporangia clustered, cylindrical, 1 to 2mm. 
high, light yellow, stalked. Stalk short, weak, buff, filled with spore like 
cells. Capillitium a very elastic network of pale yellow threads, 3 to 4mmm.^ 
in diam., expanding into a long drooping column, nearly free from the cup; 
the threads marked by sharp spines and half rings arranged in a loose 
spiral and of scattered warts. Spores pale yellow, nearly smooth, 6 to 
8mmm. in diam. 
Common. 
2. A. ferruginea Sauter. Sporangia clustered^ ovoid, 0.7 to 1.3mm. 
high, dull red, sometimes yellow, stalked. Stalk red, filled with spore like 
cells, and arising from a well developed hypothallus. Capillitium an elastic 
network of reddish yellow threads, 5 to 6mmm. in diam., smaller toward 
the base of the sporangium, free from the cup, and marked by 
conspicuous reticulations; free ends not uncommon. Spores pale red 
nearly smooth, 8 to llmmm. in diam. 
Var. 1. heterotrichia Torrend. Capillitium a dense network with 
many pointed free ends; threads closely reticulated and spinulose all over, 5 
to 8mmm. in diam. 
(Miami valley—Morgan). 
3. A. incarnata Pers. Sporangia crowded, ellipsoid, 1 to 1.5mm. high 
pink, stalked. Cup membranous, roughened. Stalk weak, short, flesh 
colored, filled with spore like cells. Capillitium a very loose elastic network 
