CLASSIFICATION 415 



2. Margin not free, indeterminate, byssoid or strigose. 



* Hymenium whitish or ochraceous. 



C. calceum (PI. XXXIII, fig. 6).— Thin, broadly effused, hy- 

 menium smooth, poUshed, whitish, often tinged with ochre or hlac 

 when dry, becoming cracked. 



On wood and bark. 



C. fcetidum. — Forming crust-hke patches ; hymenium whitish, 

 then tinged ochre, very foetid when fresh, if crushed. 



Forming a crust on sawdust, etc. ; hymenium irregular, due to 

 following the inequalities of the matrix. 



C. lacteum. — Broadly effused, thin, usually more or less wavy 

 or broken up into lobes at the edge, whitish, tinged ochre or buff 

 when dry. Cracking. 



Forming irregular patches many inches in length, margin often 

 giving off long frondose strands of mycelium. 



On wood. 



C. samhuci. — Broadly effused, thin, white. 



On old elder trunks. 



C. lactescens. — Broadly effused, rather thick, ochraceous or tinged 

 dull red, giving out a white, watery milk when broken. Becoming 

 much cracked when dry. 



Distinguished by the white milk. 



On oak, willow, etc. 



C. scutellare. — Broadly effused, thin, inseparable from the 

 matrix, margin indistinct, white, then dingy tan-colour or tawny ; 

 hymenium waxy, smooth, very much cracked in an areolate manner, 

 silky and white in the cracks. 



Recognized by the areolately cracked, tan-coloured hymenium. 



On wood, herbaceous stems, etc. 



C. IcBve (PI. XXXIII, fig. i). — Closely adnate, thin, edge radiating, 

 but not fibrillose ; hymenium hyaline, white when dry. 



Often originating as small, roundish, scattered patches, which 

 soon extend into each other. Closely attached to the matrix, 

 thin. 



On Lark, especially beech. 



C. arachnoideum. — Thin, effused, white or pallid, edge not 

 determinate, fibrillose or subfloccose below, edge fimbriated with 

 white fil rils ; hymenium waxy, continuous, only becoming cracked 

 when drj', pale ochraceous. 



Forming delicate, spreading, cobweb-hke patches, snow-white. 

 This is the usual condition, and is sterile. When perfectly de- 

 veloped the hymenium becomes compact, often spreading for several 

 inches, often with a tinge of glaucous green, pale ochraceous when 

 dry, running off at the edge into the cobweb-hke form. 



On wood, bark, moss, etc. 



