1 8 Cincinnati Society of Natiual Ilistojy. 



On the underside of old trunks and branches lying on the 

 ground; common. Effused for several inches or a foot or more. 

 This is an elegant resupinate fungus. The thick root-like fibers 

 run beneath and support the thin membrane, sometimes they run 

 out free over the matrix. The "incarnate-rufous" color of the 

 original description answers best to my specunens. 



2. O. HVDNOiDEA, Schw. Widely effused, thick, fibrillose, 

 subpulverulent, at length, hard as if corky, tawny-rufous. Warts 

 aculeate, connate, fimbriate-fibrillose at the apex, concolorous. 



On very rotten wood. Effused for several feet over the crum- 

 bling matrix. The substance at first is brittle and pulverulent but 

 becomes quite hard and corky when dry; it has the "brick color" 

 within and upon the matrix as observed in O. lateritia, B. and C. 

 The hymenium appears as if composed of hydnoid teeth fused to- 

 gether nearly to the apex often in groups ; it becomes a little darker 

 than the substance in drying. 



Genus VII. — Kneiffia, Fr. 



Hymenium amphigenous, contiguous, united but incomplete, 

 similar, strigose-exasperate with rigid setae which are scattered or 

 fasciculate. 



I. K. CANDiDissiMA, B. and C. Regularly effused, aggluti- 

 nate, thin, white, the border similar. Hymenium becoming covered 

 with numerous granules which are apiculate with rigid setK. 



On the underside of twigs and branches; rare. At first form- 

 ing a thin pure white stratum, looking like a Corticium, at length 

 thickening and sprinkled with numerous granules. Occasionally 

 it acquires a slight ochraceous tinge. 



