210 A Monograph of the Myxogastres. 



depressed, circular in outline, wall very thin, chalk-white, 

 polished, breaking away in irregular patches; columella flattened, 

 white, small, mass of spores blackish-purple ; threads of capil- 

 litium equal, about 2 p. thick, frequently branching and com- 

 bined laterally to form ct dense net; spores globose, smooth, 

 dingy violet, 9 10 /u diameter. 



Chondrioderma Saundersii, B. and Br., in Herb. 

 (Type in Herb. Berk., no. 10744.) 



On living fronds of ferns. Java. 



Resembling superficially circular forms of Chondrioderma dif- 

 formc,but, distinguished by the columella and dense capillitiuin. 

 Sporangia 2 3 mm. diameter, outline circular, often waved ; a 

 very thin powdery layer of minute granules of lime is frequently 

 present on the mass of spores, which then appears dark grey. 



Chondrioderma affine, Host. V\<WVOL c 



Sporangia small, densely crowded on a common hypothallus, 

 irregularly angular, depressed, surface smooth, greyish-white; 

 columella irregular, small, white, rarely very conspicuous; 

 threads of capillitium thin, forming a net, dirty-violet, often 

 furnished with fusiform subviolaceous protuberances; spores 

 sub violaceous, densely aculeate, 10 14 /x diameter. 



Chondrioderma affine, Host., Mon. App., p. 18; Sacc., Syll., 

 1271. 



Poland ; Germany ; France. 



Appears to be very closely allied to Didymium spumarioides 

 of the present work (Chondrioderma spumarioides, Host.) ; differ- 

 ing in the smooth surface of the sporangial wall, the dingy 

 colour of the capillitium, and the larger, densely aculeate 

 spores. 



* * Sporangium coloured. 



Chondrioderma testaceum, Rost. I 



Sporangia gregarious or crowded, sessile on a broad base, 

 hemispherical or elliptical, rather depressed, sometimes irregular 

 from mutual pressure, outer wall smooth, from, brick-red to almost 



