The Myxomycetcs of the Miami ]'alley\ Ohio. 1^3 



extremities. Spores globose, violaceous, very minutelv 

 warted, 6-S niic. in diameter. 



Growing on old wood, mosses, etc. Sporangium with the 

 stipe 2-4 mm. in height, the stipe much the shorter, the 

 sporangium .35-.40 mm. in thickness. Stemonitis typhoidcs. 

 Fries, S. M. 



2. Co.MATRiCHA .KQUALis, Pk. Sporangia usually more or 

 less inclined or curved and nodding, cylindric, obtu.se at each 

 end, growing together on a thin hypothallus. Stipe and 

 columella slender, smooth, black, extending nearly or quite 

 to the apex of the sporangium, the stipe longer than the 

 columella. Capillitium of very slender fiexuous tawny-brown 

 threads ; these branch repeatedly, forming an intricate net- 

 work of small irregular meshes, ending in very short free 

 extremities. Spores globose, minutely warted, dark viola- 

 ceous, 7-9 mic. in diameter. 



Growing on old wood. Sporangium 1.5-3 wi"i- i" height 

 by .35-40 mm. in thickness, the stipe usually about the same 

 length as the sporangium, but sometimes nearly twice as 

 long. The capillitium is rather looser than in C. typhina, 

 whence the drooping habit. Peck, Thirty- first Report, p. 42. 



3. CoMATRiCHA NIGRA, Pers. Sporangia globose or ovoid 

 to ellipsoid or oblong, erect or sometimes inclined or even 

 nodding. The stipe very long, smooth and black, tapering 

 upward, expanding at the base into a small circular hypoth- 

 allus; the columella short, reaching from one-half to three- 

 fourths the height of the sporangium. Capillitium of slender 

 fiexuous brown threads, which branch repeatedly, forming a 

 dense intricate network of small meshes, ending in very short 

 free extremities. Spores globose, even, dark violaceous, 8-10 

 mic. in diameter. 



Growing on old wood, leaves, etc. Sporangium .5-1.5 mm. 

 in height, .5-. 8 mm. in diameter, the stipe 1.5-3 nim. long or 

 sometimes considerably longer. This species seems to be 

 rare in this country. I have preferred the name adopted by 

 Schroeter to Rostafinski's Comatricha Friesiana. 



4. Comatricha Ellisii, Morgan, n. sp. Sporangia short, 

 erect, oval or ovoid to oblong. Stipe and columella erect, 

 brown and smooth, rising from a thin pallid hypothallus, 



