38 Mycetozoa of North America 



ing lime-knots. Spores pale brownish lilac, nearly smooth, 8-10 

 fji diam. 



Type locality: England. 



Habitat: On dead wood and mossy logs; common. 



Distribution: Throughout the eastern United States; *Iowa, 

 *Missouri, Quebec, ^Washington. 



Illustration: Lister, Mycetozoa ed. 3. pi. 18. 



In typical examples, the brown color is pronounced through- 

 out. In other specimens, the brown lime is only in the capillitium. 

 There are also intermediates merging into P. glohuliferum, from 

 which the species is separated mainly by color. 



8. Physarum pulcherrimum Berk. & Rav. ; Berk. Grevillea 2: 65. 



1873. (N. Y. B. G. no. 6049, type material.) 



Physarum atrorubrum Peck, Rept. N. Y. State Mus. 31: 40. 1879. (N. Y. 

 B. G. no. 7989, type material.) 



Plasmodium dark red (Lister). Sporangia gregarious, stalked, 

 globose, about 0.5 mm. diam., erect or curved, flattened beneath, 

 reddish purple varying in shade; sporangial wall membranous, 

 persistent below, pale purple, with scattered clusters of purple 

 lime-granules. Stalk concolorous or darker, subulate, brittle, 0.5 

 to 1 mm. high, containing lime. Columella small, convex, coni- 

 cal, or absent. Capillitium a close, persistent network of deli- 

 cate, purplish threads, with numerous, small, rounded, purplish 

 lime-knots. Spores pale red, nearly smooth, 7-8 n diam. 



Type locality: South Carolina. 



Habitat: On dead wood; common. 



Distribution: Throughout the eastern United States; On- 

 tario, Quebec, *Washington. 



Illustration: Lister, Mycetozoa ed. 3. pi. 19. 



Physarum roseum, a tropical species, resembles P. pulcherri- 

 mum in color, but has a translucent stalk and large, branching 

 lime-knots. 



9. Physarum Bilgramii Hagelstein, Mycologia 33: 306. 1941. 



Physarum Ulacinum Sturg. & Bilgr.; Sturg. Mycologia 9: 324. 1917. (N. 

 Y. B, G. no. 10925, type.) Not P, Ulacinum Fries. 1829. 



Plasmodium? Sporangia gregarious, globose, about 0.5 mm. 

 diam., stalked, pale lilac, pale indian-red, or pale blue; sporangial 

 wall membranous, with clusters of similarly colored lime-granules. 



