424 BRITISH FUNGI 



S. vorlicosii!)!. — Coriaceous or leathery, effuso-reflexed, obscurely 

 zoned, coarsely hirsute or hispid, margin similarly coloured ; hy- 

 menium slightly rugulose, purple or lilac. 



Intermediate between 5. hirsutum and 5. purpiireum. Agreeing 

 with the former in the coarsely strigose pileus, and with the latter 

 in the colour of the hymenium ; known from both by its thinner 

 substance, which becomes torn when dry. 



*** Entirely adnate, edge scarcely or not at all free. 



S. rufum.- — Somewhat cartilaginous, erumpent, or bursting 

 through the bark, at first appearing as a wart or tubercle, then 

 expanding and forming small circular patches ; hymenium rufous, 

 then brownish, powdered with a grey bloom. 



Bursting through the bark in small round patches or warts, 

 which gradually spread for some distance, retaining a more or less 

 circular outline, extreme edge free or loose from the matrix. Look- 

 ing like a Corticium in habit. Hymenium with small tubercles or 

 warts, often arranged in irregular concentric circles. 



On bark, usually of lime trees, 



S. frustulosiim. — Tuberculose, woody, crowded and almost run- 

 ning into each other, hence looking like one much cracked plant, 

 under surface and margin smooth, brownish black ; hymenium 

 convex, cinnamon, pruinose, becoming pale. 



Some conditions superficially resemble Corticium polygonuim. 

 Thick, tuberculose, the pieces close to each other. The patches are 

 often cracked completely through, so that the whole presents a 

 tessellated appearance. Hymenium usually cinnamon, becoming 

 paler, but sometimes persistently brown. 



On wood and bark. 



5. acerinum. — Forming a thin, white, often broadly and irregu- 

 larly effused crust, even, smooth. 



Forming a thin, white crust, generally sterile, surface usually 

 covered with minute particles of lime. 



On living bark of Acer campestre and on fallen trunks of various 

 trees, 



5. stratosnm. — Effused, clear pale ochraceous, smooth, here and 

 there rugose or wrinkled, becoming yellowish. 

 . On wood. An imperfectly known species. 



Cladoderris 



Cap with a central or lateral stem, or sessile ; hymenium con- 

 fined to one side, furnished with radiating ridges which are often 

 nodulose or warted. 



Texture dry. Resembhng Thelephora in the hymenium, but differ- 

 ing in the elongated, colourless spores. Allied to Stcreum ; differing 

 in the rugulose hymenium. Essentially a tropical genus ; some of 

 the species are quite large and somewhat fleshy, but dry. 



