DiDYMIUM 121 



into membranous vesicles filled with lime-crystals. Spores pur- 

 plish brown, 9-12 fj. diam., paler on one side, strongly warted, 

 with the warts smaller on the pale side; in irregular develop- 

 ments, the warts may be replaced by small patches of close 

 reticulation. 



Type locality: Algeria. 



Habitat: On decaying leaves and straw. 



Distribution: *California. 



Illustration: Lister, Mycetozoa ed. 3. pi. 106. 



A well-marked species with characters not present in any 

 other species of Didymium. 



6. Didymium complanatum (Batsch) Rost. Mon. 151. 1874. 

 Lycoperdon complanatum Batsch, Elench. Fung. Cont. 1: 25L 1786. 



Plasmodium lemon-yellow (Lister). Sporangia forming scat- 

 tered or solitary depressed plasmodiocarps 2 to 8 mm. broad, 

 0.1 to 0.15 mm. thick, either effused, perforated and net-like, or 

 vermiform, gray; sporangial wall membranous, colorless, with 

 scattered superficial stellate crystals of lime. Columella none. 

 Capillitium consisting of very slender, pale violet threads, some- 

 what branching and anastomosing, connected with numerous, 

 subglobose vesicles 20-50 m diam., filled with yellow, obscurely 

 granular matter. Spores pale violet-brown, minutely warted, 

 7-9 ix diam. 



Type locality: Europe. 



Habitat: On dead leaves and stems. 



Distribution: Florida, *Iowa, *Maine, *New York, *Penn- 

 sylvania, Tennessee. 



Illustration: Lister, Mycetozoa ed. 3. pi. 107. 



This species is distinguished from all other species of Di- 

 dymium forming similar efi^used and depressed plasmodiocarps 

 by the vesicles in the capillitium. 



7. Didymium parietale Martin & Brooks, Trans. Am. Mic. Soc. 

 57: 320. 1938. (N. Y. B. G. no. 8944, type material.) 



Plasmodium? Sporangia sessile, crowded, forming branched 

 or netted plasmodiocarps, laterally compressed, 0.2 to 0.4 mm. 

 broad, 0.3 to 0.5 mm. high, and up to 12 mm. or more across, 

 white or gray; sporangial wall membranous with sparsely dis- 



