244 A Monograph of the Myxogastres. 



covered with minute squamules of lime ; columella absent ; 

 threads of the capillitium very slender (08, 3 \t. diam.), forming 

 a flaccid, very dense net; spores blackish-brown, verruculose, 

 12, 513, 2 \i diameter. 



Chondrioderma leptotrichum, Racib., Myx. Crac., p. 7, f. 4; 

 Sacc., Syll., 1267. 



Poland. 



Removed from Chondrioderma on account of the furfuraceous 

 and not porcelain-like wall of the sporangium. 



Didymium Listeri, Mass. (figs. 97101).' 



Plasmodium pulvinato-compressed, in large, irregular, scattered 

 patches; outer wall white, with a thick layer of stellate crystals 

 of lime, rather fragile, breaking away in irregular patches ; 

 inner wall very thin ; columella absent ; capillitium dense, threads 

 parallel, without free ends, often forming acute-angled dichoto- 

 mies and connected by transverse bars, dark brown, usually 

 branched near the paler tips that are attached to the wall'; 

 spores globose, dingy lilac, minutely warted, 8 10 ft diameter. 



" Didymium dubium, Rost.," Lister in Herb., Kew. 



On dead leaves. Britain (Lyme Regis). 



The present species superficially resembles D. dubium, but is 

 quite distinct in the copiously anastomosing threals of the 

 capillitium which are entirely destitute of free, curved, spine- 

 like branches. Plasmodia 3 7 mm. across. 



Didymium Tussulaginis, Mass. ' 



Sporangia sessile on a broad base, hemispherical or irregular 

 and plasmodiocarp, wall thin, pinkish-grey, more or less iri- 

 descent, with minute, scattered crystals of lime, dehiscing irregu- 

 larly ; capillitium well-developed, springing from the base of the 

 sporangium, threads repeatedly branching in a dichotomous manner, 

 rarely anastomosing, with scattered, small swellings usually con- 

 taining one large or two to four small crystals of lime ; spores 

 black-brown in the mass, pale brown with a lilac tinge by 

 transmitted light, globose, very minutely verruculose or quite 

 smooth, 12 14 /x diameter. 



