190 THE MYXOMYCETES 



Island reported by Mr. Hagelstein, in both cases on lumber from 

 other localities, one of these being Nova Scotia. 



3. Echinostelium de Bary 

 in Rost., Versuch 7 : 1873. 



Sporangia distinct, globose, minute, the structure limited to a few 

 imperfect rib-like, loosely joined branches developed from the short 

 columella or stem-top, sustaining the spores. 



A single species: — 



Echinostelium minutum de Bary 



in Rost., Mon. 215. 1875. 

 PI. XXI, Figs. 552, 553. 



Sporangia distinct, scattered, globose, very minute, 40-50 fx, stipi- 

 tate; stipe hair-like, subulate, granular but hyaline; columella minute 

 or none; capillitium consisting of a few arcuate spinose threads, loosely 

 united, supporting the uncovered spores; spores globose, pinkish or 

 colorless, smooth, 7-8 jjl. 



Originally discovered by de Bary in Germany, it has since been re- 

 ported from several localities in Great Britain, Austria and Rumania. 

 In North America it has been collected from five widely scattered 

 localities, once by Professor Thaxter on a laboratory culture from 

 Maine, again by Mr. Bilgram in Philadelphia and a number of times 

 by the junior author and by Mr. H. C. Gilbert on bark and wood from 

 Vermont, West Virginia and Iowa. Apparently common and wide- 

 spread, but because of its extreme minuteness rarely reported. 



4. Clastoderma Blytt 

 Bot. Zeitung 38 : 343. 1880. 

 Sporangium globose, distinct, stipitate; columella short or obsolete; 

 capillitium of few sparsely branched threads, which bear at their tops 

 the persistent fragments of the peridium, but are not otherwise united. 

 Distinguished from Lamproderma by the peculiar manner in which 

 the peridium is ruptured, and by the simplicity of the scanty capilli- 

 tium. So far there appears to be but a single species. 



Clastoderma debaryanum Blytt 



Bot. Zeitung 38 : 343. 1880. 

 PI. XXI, Fig. 554. 



1886. Orthotricha microcephala Wing., Jour. Myc. 2 : 125. 



Sporangia scattered or gregarious, very minute, 0.1 to 0.2 mm. in 

 diameter; peridium fugacious, except for the minute circular or po- 



