Chondriodei 'ma. 207 



mutual pressure, snow-white, polished, dehiscing irregularly ; 

 columella large, depressed, dirty ochraceous or brownish; capil- 

 litium dense, threads 2 3 /x thick at the base, remaining for 

 some distance simple, then bifurcating and anastomosing laterally, 

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

 verruculose, many of the warts showing a tendency to become 

 elongated into ridges, 10 12 /x thick. 



Chondrioderma niveum, Host., Mon., p. 170; Cooke, Myx. 

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



(Specimen named by Rostafinski in Hb. Berk.) 



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



Scattered or crowded, 2 2'5 mm. across. 



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



Gregarioiis ; regular, hemispherical, sometimes slightly de- 

 pressed, sessile on a broad base, wall 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 numerous 

 points to form large, irregular, membranaceous expansions of a 

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

 culose, 8 11 /x diameter. 



Chondrioderma Cookei, 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, i ' s f c< 



Sporangia scattered or crowded, subglobose, sessile on a broad 

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

 white, fragile, dehiscing in a circumscissile manner ; columella 

 subglobose, white, sometimes almost obsolete ; capillitium dense, 



