24G A Monn(fraj)h of the Miixogastres. 



Tlic granulosc wall of the sporangimii separates the present 

 species from the genus Chmidriodcnnc. 



Didymium dubium, Host. (fig. 102). 



Plasmodium pulvinate, arcuate, in crowded clusters, the outer 

 Avail white, with stellate crystals of lime, hreaking away from 

 inner wall in irregular pieces; threads of capillitium rigid, 

 rarely forking, forming a loose net, fvrniahed with curved sinnes, 

 spores obscure violet, minutely vcrrundosc, 10 — 11 ix diameter. 



Didyriiium. duhium, Rost., Mon., p. 153; Sacc, Syll., n. 1298. 



Britain (Lyndhurst) ; Bohemia. 



Sub-Gen. Atricha. 



Capillitium obsolete ; columella absent. 



The two species constituting the present subgenus are un- 

 doubtedly degenerate species of Didymium, characterized by 

 the very rudimentary condition, or entire absence of the 

 capillitium. 



Didymium sinapinum, Cooke (figs. 167, 168). 



Clavate, subcylindrical, or more or less irregular, wall brittle 

 with lime, at first compact, then hreaking ujy into bright yellow, 

 easily detached, 2)articlcs, becoming irregularly ruptured at the 

 apex, basal attenuated stem-lilcc 2^ortiun darker, often vAth a 

 ■purjile tinge ; hypothallus spreading, thin ; mass of spores 

 blackish -purple ; spores globose, dingy lilac, minutely warted, 

 7 — 9 [X diameter. 



Didymium sincqnnum, Cooke, Brit. Myx., p. 33, fig. 245 ; 

 Sacc, Syll., n. 1319. 



(Type in Herb., Kew.) 



On leaves. Wales (Forden). 



Growing in isolated patches, gregarious or crowded, springing 

 from a common hypothallus, sporangia 1 — 1 '5 mm. high, usually 

 moro or less clavate, now and then irregularly lobed and form- 

 ing a small aethalium consisting of two or three sporangia, 

 bright sulphur-yellow ; in rare instances a few very thin, bifur- 



