Chondrioderma. 207 



mutual pressure, snow-white, polished, dehiscing irref;ularly ; 

 columella large, depressed, dirty ochraceoics or hroionish ; capil- 

 litium dense, threads 2 — 3 \x thick at the base, rcmainiiKj for 

 some distance simple, then hifurcating and anastomosing laterally, 

 pale and lilac-brown ; spores globose, pale lilac, very miimtcly 

 verrueulose, many of the warts showing a tendency to become 

 elongated into ridges, 10 — 12 /x thick. 



Chondrioderma oiiveum, Rost,, Mon., p. 170 ; Cooke, Myx. 

 Brit., p. 37; Sacc, Syll., 1259. 



(Specimen named by Eostafinski in Hb. Berk.) 



On leaves, grass, wood. Britain (Linlithgow). 



Scattered or crowded, 2 — 2'o mm. across. 



Chondrioderma virgineum, Mass. (n. sp.) (figs. 216 — 220). 



Gregarious; regular, hemispherieal, sometimes slightly de- 

 pressed, sessile on a broad base, ivall at first polished, snow-white, 

 the outer film falling away in patches, grey or pulverulent below ; 

 columella snow-white, depressed, rugose, extending over the 

 greater portion of base of sporangium ; capillitium forming a 

 dense net, threads very thin, colourless, combining at mimerous 

 ptoints to form large, ir^rgular, membranaceous expansions of a 

 pale lilac colour ; spores globose, pale lilac, very minutely vcrru- 

 culose, 8 — 11 fjL diameter. 



Chondrioderma Coohei, Mass., in Herb., Kew. 



On leaves. Britain (Hampstead). 



(Type in Herb., Kew. ) 



Densely gregarious, but not crowded, about '5 diameter. 

 Agreeing with Chondrioderma Friesianum, Host., in the struc- 

 ture of the sporangial wall, but distinct in the capillitium and 

 spores. 



Chondrioderma dealbata, Mass. 



Sporangia scattered or crowded, subglobose, sessile on a broad 



base, sometimes seated on a white hypothallus, wall very smooth, 



■white, fragile, dehiscing in a circuinscusilc manner; columella 



s^tbglobose, white, sometimes almost obsolete ; capillitium dense. 



