402 BRITISH FUNGI 



In this genus the well-formed spines present in Hydnum, or the 

 j)latc-hke teeth in Irpex, are replaced by more or less elongated, 

 deformed, tubercular outgrowths. 



R. pendiihim.^Efiused for 2-3 in. or more, bursting through 

 cracks in the bark, whitish, upper edge slightly reflexed, thickish, 

 soft ; tubercles about i line long, irregular, pendulous. 



On alder, pine, birch, etc. 



R. orhictdare. — Suborbicular, several patches frequently growing 

 into each other, white or tinged dull yellow, edge downy ; tuber- 

 cles more or less cjdindrical, scattered or in clusters, about i line 

 long. 



Tubercles often pendulous or adpressed. Often becoming dingy 

 flesh-colour the second season. 



Bursting through dead bark of various trees. 



R.quercinum. — Closely adnate,subcircular, then irregularly effused 

 for several inches, white, then pallid or tinged flesh-colour ; tuber- 

 cles stout, 2-3 lines long, often in clusters, tips minutely spinulose. 



Distinguished by the spinulose or villose tips of the tubercles. 

 Patches sometimes a foot or more broad, edge fringed, white. 



On wood, more especially oak. 



R. tomentosum. — Irregularly effused for 1-3 in., rather thick, 

 whitish, edge more or less free and erect, downy ; tubercles short, 

 crowded, irregular in form, often gro\\ing to each other. 



On various trees, also on sawdust. 



R. deglubens. — Orbicular, about ^ in. across, edge broadly free 

 and upturned, flesh-colour with a rusty tinge ; tubercles about 

 I line long, very irregular, cylindrical or plate-like and toothed. 



On ash. 



R. coralliniim.- — Effused for 2-3 in., whitish, thin, shining ; 

 tubercles scattered in clusters, irregular, coralloid, 2-3 lines long. 



On oak branches. 



R. epileiiciim. — Effused for several inches, very thin, entirely 

 adnate, waxy, pohshed, pale ochre ; tubercles sparingly scattered, 

 variable in size, up to 2 hues in length, brittle, tips often fimbriated. 



On naked wood. 



R. fagineum. — Bursting through the bark, broadly effused, edge 

 \-elvety, rusty orange ; hymenium whitish ; tubercles irregular. 



On dead beech. Surrounding the branches and resembling 

 stalactite. 



CiRANniNIA 



Forming thin, white, effused crusts, which, seen under a lens, 

 are covered with crowded, minute warts usually having the tips 

 slightly indented. 



Soft, encrusting fungi, thin, presenting a minutely granular sur- 

 face, warts globular or hemispherical, regular, smooth. 



