DIDYMIUM 127 



coarse, flat, dichotomously branching threads, broader below; spores 

 minutely warted, or almost smooth, dark brown, 12-14 fi. 



The white crust-like outer wall has more than once carried this 

 species into Diderma. It is still doubtful whether we are here deal- 

 ing with Chondrioderma calcareum Rost. Miss Lister cites a variety, 

 S. difforme comatum, with more abundant capillitium which may 

 represent Rostafinski's species. 



Evidently rare in the United States; reported more common in 

 Europe and eastward. In our specimens the crust-like outer peridium 

 shows crystals on the broken edge only; the body of the object, as its 

 outer surface seems to be amorphous. 



17. DiDYMIUM QUITENSE (Pat.) Torr. 



1895. Chondrioderma quitense Pat., Bull. Soc. Myc. Fr., XL, p. 212. 



1909. Didymium quitense (Pat.) Torn, Flor. Myxom., p. 150. 



1911. Didymium quitense Torn, List., Mycetozoa, 2nd ed., p. 126. 



1913. Didymium quitense (Pat.) Torn, Sturg., Myx., CoL IL, p. 446. 



Sporangia more or less plasmodiocarpous, scattered, depressed, 

 white; the outer peridium distinct, crust-like, remote from the thin 

 membranous inner wall ; columella undefined ; capillitium brown, 

 much branched, forming a network especially outwardly; spores very 

 dark violaceous-brown, rough with a tendency to obscure reticulation ; 

 12-14 II. 



This species is different from D. difforme chiefly in the rougher 

 and somewhat banded epispore. It is reported from Ecuador by 

 Father Torrend, and from Colorado mountains by Dr. Sturgis to 

 whose kindness I am indebted for the specimens here described. Evi- 

 dently a high mountain species. 



Colorado. 



18fl, Didymium anomalum Sturg. 



Plate XIX., Figs. 13 and U a. 

 1913. Didymium anomalum Sturg. Myxomycetes of Col., IL, p. 444 

 Sporangia in the form of very thin effused grey plasmodiocarps, 

 2-10 cm. long, 1 mm. or less in thickness. Wall single or membran- 

 ous, hyaline or yellowish, with rather scanty deposits of small, stel- 



