PENIOPHORA. 113 



On wood and bark. When perfectly developed, the hy- 

 menium bristles with cystidia, which are more cylindrical 

 and less incrusted with lime than usual. In some specimens 

 the hymenium is very much cracked, in others quite con- 

 tinuous. The marginal radiating strands of mycelium often 

 extend for many inches and connect several fertile patches. 



Peniophora rimosa. Cooke. 



Broadly effused, inseparable, margin indeterminate ; hy- 

 menium ochraceous, when dry cracked, minutely velvety, 

 cystidia scattered or in clusters, fusoid, 70-100 x 15-18 /u.; 

 spores elliptic-oblong, slightly curved, 15-17 x 6 /x. 



Peniophora rimosa, Cke., Grev., ix. p. 94; Mass., Mon. 

 Thel., p. 153. 



On bark and wood. Very closely resembling cracked 

 forms of Peniophora velutina, from which it diifers in the 

 larger spores. The hymenium is usually cracked into nu- 

 merous irreg-ular polygonal portions. 



Peniophora Scotica. Mass. 



Broadly effused, margin fibrillose, radiating; hymenium 

 pale cinnamon, minutely velvety ; cystidia sub-cylindrical, 

 80-120 X 15-20 ;a; spores elliptical, 8-10 x 6-7 fx. 



Peniophora Scotica, Mass., Mon. Thel., jo. 152. 



Broadly effused over the inside of bark. Closely related 

 to Peniophora velutina, differing in colour and absence of the 

 radiating marginal strands of mycelium, the cystidia are 

 also larger in the present species. 



Peniophora phyllophila. Mass. 



Broadly effused, membranaceous, margin fibrillose, often 

 indeterminate ; hymenium cream-colour, continuous, cystidia 

 fusoid or cylindrical, with the apex sometimes thickened, 

 60-80 x 20-30 /x; spores elliptic. 12 x 6 /a. 



Peniophora pihijllophila, Mass., Mon. Thel., p. 150. 



On dead leaves. Closely resembling in habit and colour 

 Corticium epiphyllum, P., but distinguished by the numerous 

 cystidia. 



Peniophora pubera. Mass. 

 Broadly effused, thin, inseparable, indeterminate, hymenium 

 whitish or dirty pale buft", minutely velvety, cracked when 



VOL, I. I 



