220 THE MYXOMYCETES 



stipe black, slender, 2-6 mm. in length; spore-mass black; spores by- 

 transmitted light pale blue, minutely spinulose, 6-8 fx. Plasmodium 

 white. 



Resembling C. languescens in form and size, but with a proportion- 

 ately longer stipe. The dark blue color, almost black, and the large, 

 dark granules in the caly cuius and nodes are distinctive. 



On very rotten wood. Switzerland. 



23. Cribraria elegans Berk. 6* Curt. 



Grev. 2 : 67. 1873. 

 PI. XIV, Figs. 361, 362. 



Sporangia gregarious, globose, erect or nodding, small, 0.4-0.5 mm., 

 deep lilac or reddish purple, stipitate; stipe long, slender, tapering 

 upward, almost black, arising from a scanty hypothallus; calyculus 

 about half the sporangium, finely ribbed, covered especially above 

 with small purple granules, the margin toothed or perforate; net well 

 developed, the meshes small, polygonal, the threads delicate, colorless 

 with many free ends; nodules dark colored, numerous and some- 

 what prominent; spore-mass purple; spores by transmitted light pale 

 violaceous, smooth, 6-6.5 /z. 



To be compared with C. purpurea. The small-meshed net with well- 

 defined dark colored nodules is distinctive, aside from the fact of the 

 much smaller sporangia. The stipe is also different, more slender, 

 smooth and dark colored. The habitat of the two species appears to 

 be the same. The present species is the more common. 



Nova Scotia, New York, Pennsylvania, South Carolina, Missouri, 

 Iowa, South Dakota, Washington. 



24. Cribraria violacea Rex 



Proc. Acad. Nat. Sc. Phila. 1891 : 393. 

 PL XIV, Figs. 363, 364. 



Sporangia scattered or gregarious, very small, 0.2-0.3 mm. in di- 

 ameter, violet, erect, stipitate; stipe short, about one-half the total 

 height, concolorous, slender, tapering upward; calyculus crateriform, 

 occupying about two-thirds of the sporangium, persistent, marked 

 with minute plasmodic granules ; net rudimentary or poorly developed, 

 the meshes large, irregular, the nodules also large-triangular, viola- 

 ceous; spores pale violet in mass, lilac by transmitted light, 7-8 n, 

 minutely warted. Plasmodium violet-black. 



A very minute but well-marked species discovered by Dr. Rex in 

 Wissahickon Park, near Philadelphia; rarely collected. In minuteness 



