THE SLIME MOLDS OF OHIO 
45 
A. Sporangia sessile. 
B. Spores reticulated. 
B. Spores minutely warted. 
1. H. serpula 
C. Spiral bands prominent. 
C. Spiral bands indistinct. 
2. H. abietina 
3. H. karstenii 
A. Sporangia stalked. 
D. Sporangia clustered. 
D. Sporangia scattered. 
4. H. vesparium 
E. Stalk solid. 
F. Capillitium with spines. 
F. Capillitium without spines. 
6. H. leiotricha 
7. H. clavata 
5. H. mtorta 
E. Stalk hollow but filled with spore like cells. 
1. H. serpula (Scop.) Rost. Sporangia forming elongated branched 
and reticulated plasmodiocarps, 0.4 to 0.6mm. wide yellow, or rusty in 
color. Capillitium a loose tangle of long yellow threads sparingly branched, 
marked by from three to five well defined regular spiral bands, spinulose 
or smooth. Spores yellow, reticulated, 10 to 12mmm. in diam. 
(Hamilton Co.—Lloyd Herbarium), (Licking Co.—Oberlin College 
Herbarium). 
2. H. abietina (Wigand) Lister. Sporangia gregarious, subglobose or 
turbinate, about 0.5mm. in diam., yellow, sessile, sometimes with short 
stalks. Sporangium wall thin, yellow, persistent below as a cup. Capil¬ 
litium consisting of twisted, sparingly branched, yellow threads 5 to 
6mmm. in diam., marked by from one to three prominent and irregular 
spiral bands; free ends swollen and rounded. Spores yellow, minutely 
warted, 10 to llmmm. in diam. 
Medina Co., (Ohio—Macbride). 
3. H. karstenii (Rost.) Lister. Sporangia subglobose or forming 
elongated curved plasmodiocarps, 0.25 to 0.5mm. broad, reddish brown, 
sessile. Capillitium a network of dull red threads, marked by indistinct 
spiral bands and with prominent ring shaped thickenings or irregular 
expansions. Spores yellow, minutely warted, 9 to 15mmm. in diam. 
Cuyahoga Co. 
4. H. vesparium (Batsch) Macbride. Sporangia clustered, clavate or 
subcylindrical, 0.5 to 0.7mm. in diam., dark red, shining, stalked or sessile. 
Stalks solid, several usually joined together, red, furrowed. Capillitium 
an imperfect net of twisted sparingly branched, orange red threads, marked 
by from three to five spiral bands, prominently spinulose, free ends pointed. 
Spores orange red, warted, 10 to llmmm. in diam. 
Common on rotten logs. 
5. H. intorta Lister. Sporangia scattered, turbinate, 0.3 to 0.7mm. in 
diam., orange yellow, shining, stalked. Stalk solid, furrowed, purplish 
brown. Capillitium a tangled mass of sparingly branched orange yellow 
