50 Mycetozoa of North America 



scattered, small, rounded, yellow or white. Spores pale brownish 

 violet, minutely spinulose, 5-7 /x diam. 



Type locality: Philadelphia, Pennsylvania. 



Habitat: On dead wood and mosses. 



Distribution: *California, *Maine, New Hampshire, New 

 York, North Carolina, *Ohio, Ontario, Oregon, Pennsylvania, 

 Quebec, Tennessee, Virginia, *Washington. 



Illustration: Lister, Mycetozoa ed. 3. pi. 36. 



This species may be expected anywhere, as it is not rare, al- 

 though usually forming small colonies so that it may easily be 

 overlooked. The distinctive and characteristic feature is the 

 translucent stalk, penetrating the sporangium to near the top. 



25. Physarum citrinellum Peck, Rept. N. Y. State Mus. 31: 57. 

 1879. (N. Y. B. G. no. 7977, type material.) 



Z?Mf>'wiMw^z;7'</Mm Peck, Rept. N.Y. State Mus. 28: 54. 1876. (N. Y. B. G. 

 nos. 5629, 7978, 10919, type material.) 



Plasmodium' greenish white (Lister). Sporangia gregarious, 

 subglobose, 0.6 to 0.8 mm. diam., stalked, erect, rugose, yellow or 

 ochraceous, tinged with orange at the base; sporangial wall of 

 two layers, the outer cartilaginous, yellow, rugose, with dense 

 included deposits of lime, separating easily from the colorless, 

 membranous inner layer. Stalk cylindrical, 0.2 to 0.4 mm. high, 

 stout, plicate, orange-red or reddish brown, translucent. Capil- 

 litium a network of hyaline threads, with many large, irregular 

 and branching, white lime-knots. Spores purplish brown, strongly 

 spinulose, 10-12 /x diam. 



Type locality: New York. 



Habitat: On mosses and dead wood. 



Distribution: New Hampshire, New York, North Carolina, 

 *Oregon, Quebec. 



Illustration: Lister, Mycetozoa ed. 3. pi. 68. 



A favorite habitat for the species is on the sides of wet, mossy 

 rocks in secluded places. It is a large form and easily recognized. 



26. Physarum carneum G. Lister & Sturg. ; G. Lister, Jour. Bot. 

 48: 73. 1910. (N. Y. B. G. no. 11084, type.) 



Plasmodium mustard-yellow (Lister). Sporangia gregarious, 

 subglobose, 0.4 to 0.6 mm. diam., stalked, rarely sessile or forming 

 short i^lasmodiocarps, ochraceous yellow with a reddish base, or 



