134 FUNGUS-FLORA. 



On bark and -wood. Intermediate beweon Stcreum liirsutnm 

 Hnd S. jyiirjmreiiiii, agrccu^Q wh]i the former in the coarsely 

 strigose pileus, and with the latter in the colour of the hyme- 

 ninm ; known by its thinner substance, which becomes more 

 or less torn when dry. 



*** Entirely resupinate, margin scarcely or not at all free. 



Stereum rufum. Fr. 



Coriaceous-cartilaginous, erumpent, at fii'st tuberculiform, 

 tlien expanding and forming small circular patches ; hyme- 

 nium rufous, then brownish, powdered with a grey bloom, 

 more or less tuberculose, at length cracked ; spores elliptical, 

 6-7 X 4 fi. 



Stereum rufnm, Fries, Epicr,, p. 552; Mass., Mon. Thel., 

 p. 198. 



On bark, usually lime. Bursting through the bark as 

 rounded patches, which spread for some distance, keeping 

 more or less circular in outline, thin, extreme margin free ; 

 looking like a Corticium in habit; hymenium with small 

 tubercles that are often arranged in indistinct concentric 

 circles. 



Stereum frustulosum. Fr. 



Tuberculose, woodj', crowded and almost confluent, hence 

 looking like one much cracked specimen, under surface and 

 margin glabrous, brownish-black ; hjmienium convex, cin- 

 namon, becoming pale, pruinose; spores elliptical, ends 

 sul)acuto, 4-5 x 3-3*5 fx. 



Stcreinn frustulosum. Fries, Epicr., p. 552 ; Mass., Mon. 

 TheL, p. liJ9. 



Tlieh'ijhora frustulosa, Fries, Syst. Mycol. i. p. 445. 



On wood and bark. Some states superficially resemble 

 C<yrticium j)oly(j<nihim. Thick, tuberculose small patches almost 

 confluent ; the patches arc often cracked completely through, 

 so that the whole presents a tesselatcd appearance ; hyme- 

 nium usually cinnamon, becoming paler, but sometimes 

 persistently brown. 



Stereum acerinum. Fr. 



Forming a thin, Avhite, often broadly and irregularly 

 eftused crust, oven, smooth ; spores elliptical, G x 3-4 fx. 



