26 THE NORTH AMERICAN SLIME-MOULDS 



Plasmodium orange-yellow, i^thalium globoid, very small, 1 cm. 

 or less, the cortex very thin, greenish yellow; sporangial walls not 

 evident; capillitium well-developed, the numerous calcareous nodes 

 fusiform or often branching, and connected by rather short, trans- 

 parent internodes; spores coarsely warted, 10-11 /x. 



This form seems to differ from F. septica chiefly in its constant 

 diminutive habit of fruiting, in its delicate cortex, and in its spores, 

 brighter, larger, and more coarsely warted. The descriptions and 

 figure by Schweinitz seem referable to nothing else. First reported 

 by Albertini and Schweinitz from Germany; by Schweinitz from the 

 Carolinas; then by Dr. Peck described as a Licea from New York. 

 It seems less commonly collected in the United States. 



2. FuLiGO ciNEREA (Schiv.) Morg. 



Plate X., Figs. 3, 3 a, and 3 h, and Plate XXIII. 



1831. Enteridium cinereum Schw., N. A. F., No. 2365. 



1875. Physarum ellipsosporum Rost., Mon. App., p. 10. 



1884. ^thaliopsis siercoriformis Zopf., Pilzthiere, p. 150. 



1894. Fuitgo ellipsospora Lister, Mycetozoa, p. 67. 



1896. Fuligo drier ea (Schw.) Morg., Cin. Soc. Nat. Hist., p. 105. 



1899. Physarum ellipsosporum Rost., Macbr. N. A. S., p. 27. 



1911. Fuligo cinerea Morg., List., Mycetozoa, 2nd ed., p. 88. 



Plasmodium milk-white, watery. Plasmodiocarp long and widely 

 effused, anon winding, here and there reticulate, always applanate; 

 sometimes in form an aethalium, the peridial cortex membranous, 

 firm, thick, and white. Capillitium well-developed, furnished with 

 lime. Spores thin-walled, ellipsoidal, violaceous, plicate-rugose, 14- 

 16 X 11-12/.. 



Not common. Found occasionally in shaded situations on piles of 

 rotting straw or in the woods, especially on detritus of the bracken. 

 The spores are many of them ellipsoidal ; some are spherical ; all are 

 decidedly spinulose, perhaps might appear plicate-rugulose when dry 

 or shrunken. Calcareous nodules very large and irregular, white. 



Schweinitz, loc. cit., described this form as Enteridium cinereum. 

 Rostafinski referred it to the genus Physarum, but was obliged to 

 adopt also a new specific name, as that suggested by Schweinitz was 



