198 Mycetozoa of North America 



the genus Crihraria, have a tendency to alter in color. C. cuprea 

 is a short-stalked phase of the species with more or less copper- 

 colored spores. The typical form is quite variable in the color 

 of the spores, so that a particular shade is hardly worthy of spe- 

 cific separation. Other differences are the usual ones to be ex- 

 pected in all species of Crihraria. 



12. Cribraria microcarpa (Schrad.) Pers. Syn. Meth. Fung. 190. 

 1801. 



Dictydium microcarpum Schrad. Nov. Gen. PI. 13. 1797. 

 Crihraria teneJla Schrad. var. concinna G. Lister, Mycetozoa ed. 3. 175. 1925. 

 (N. Y. B. G. nos. 1260, 5397, 13017, authentic material.) 



Plasmodium greenish or purplish black (Lister). Total height 

 0.7 to 2 mm. Sporangia gregarious, stalked, erect or nodding, 

 globose, 0.1 to 0.4 mm. diam., ochraceous; cup wanting, except 

 occasionally for a small basal disc; net close, regular; nodes of the 

 net dark, prominent, thickened and rounded, charged with dark 

 plasmodic granules 1-2 n diam., and connected by five or six 

 slender threads. Stalks slender, four to ten times the height 

 of the sporangium, purplish brown. Spores pale ochraceous, 

 faintly warted, 5-7 m diam. 



Type locality: Germany. 



Habitat: On dead wood. 



Distribution: Colorado, Connecticut, *Dominica, Florida, 

 Indiana, *Iowa, Massachusetts, *Missouri, *New Hampshire, 

 New York, North Carolina, *Ohio, Ontario, Pennsylvania. 



Illustrations: Lister, Mycetozoa ed. 3. pi. 145, figs. d~h 

 (color confusing); Macbr. & Martin, My.xomycetes pi. 14, figs. 

 334, 335, 336. 



Lister (Mycetozoa ed. 3. 177. 1925) describes C. microcarpa 

 as a purplish red form with spores pale red in mass, which would 

 place it with forms near Cribraria purpurea. C. tenella var. 

 concinna was proposed on specimens from various places in North 

 America, and described as differing from C. microcarpa in the 

 yellow-brown color of the sporangia, and the smaller plasmodic 

 granules. Portions of several of those collections are in the 

 Herbarium of the New York Botanical Garden, as well as speci- 

 mens of C. microcarpa determined by Miss Lister. Differences 

 between all specimens here are imperceptible. It is possible that 

 C. microcarpa in Europe represents a form different from that 

 found in North America. The conception of American students. 



