198 Cincinnati Society of Natural History. 



II. Resupinati. Wholly rcsiipinate. 



4. H. UMBRiNA, B. &. C. Coriaceous, resupinate, adnate ; 

 the margin free and flexuous, but scarcely reflexed. Hymenium 

 dark umber with a paler border, thickly beset with minute bristles. 



On rotten wood and bark; rare. Effused irregularly for an 

 inch or so, of a spongy texture, and somewhat separable from the 

 substratum. 



5. H. iNSULARis, Berk. Coriaceous, resupinate, closely 

 adnate, with a narrow white byssine border. Hymenium reddish- 

 brown, thickly clothed with minute brisdes. 



On branches of sugar maple ; common. At first in small 

 circular patches with an elegant white-fringed margin; these at 

 length become confluent and effused for several inches. A very 

 different thing from Sterciim albobadium which though velvety 

 exhibits no setulje. 



6. H. PURPUREA, Cooke and Morgan. Coriaceous-spongy, 

 resupinate, closely adnate, with a byssine border. Hymenium 

 purple, fading to pale brownish, velvety with minute bristles. 



On bark of hickory ; not rare. Irregularly effused for several 

 inches, of a spongy texture, bright purple with a paler margin; the 

 bright color soon fades to a pale or dull brownish or alutaceous. 



7. H. CORRUGATA, Fr. Subcffused, closely adnate, soon 

 grumous, pale cinnamon. Hymenium covered with ferruginous 

 bristles, when dry very much cracked. 



On branches of sugar maple, beech, etc.; common. Effused 

 for many inches or even for several feet, forming a very thin closely 

 adnate pale brown stratum. 



8. H. SPRETA, Peck. Effused, thick, adnate, ferruginous. 

 Hymenium somewhat uneven, beset with rather long slender setse, 

 at length cracking into frustulate areola. 



On old wood ; rare. Effused for several inches and much 

 resembling the preceding species, but of a brighter color, thicker 

 substance and with more delicate setje. 



Genus VI. — Corticium, Fr. 



Hymenium amphigenous, even or tuberculose, arising im- 

 mediately out of the mycelium and without an intermediate 

 stratum. 



In the typical species the hymenium is fertile and swelling 

 when wet, soft-fleshy, contracted by dryness and thence conimonly 



