14 Cinciiinati Society of Natural History. 



On wood and l)ark. Effused for several inches with scarcely 

 any border. The aculei are pubescent, with some long hairs at the 

 apex. 



28. H. FAKIK.ACEUM Pers. Subiculum effused, indeterminate, 

 mealy-crustaceous, white ; the border more or less flocculose, 

 Aculei slender, rather distant, very acute, entire, concolorous. 



On old Beech bark. Effused for an inch or more. The subicu- 

 lum is a very thin, white, mealy stratum, closely adnate to the 

 matrix. The aculei are minute, sharj) pointed and not crowded. 



29. H. NUDUM, B. and C. Subiculum innate or nearly ob- 

 solete, farinaceous, pale ochraceoiis. Aculei minute, short, dis- 

 tant, subulate, concolorous. 



Oil wood and the inner bark of Sugar Maple. The subiculum 

 is nearly the color of the wood, and the aculei in some places seem 

 to be growing on the wood; but .here is usually a tinge of color to 

 indicate tlie presence of the subiculum, though the fibers of the 

 wood may be quite distinct. 



30. H. suBTii.ii, Fr. Subiculum very tender, innate in spots, 

 glabrous, watery, whitish. Aculei distant, acute or incised, con- 

 colorous. 



On bark and wood. Sul)ic:ulum indeterminate, evanescent, 

 whitish, somewhat hyaline. Aculei very short, miiiute, fcdling 

 awa\ to the touch. 



(lenus 1 1. - I ki'i:\, Fr. 

 Mvmeniuni inferior, dentate; the teeth seriately or reticulately 

 arranged, and i:onnected together at the base by folds, which are 

 lamellate or porose. l-'ungi lignatile. 



1. Ai'trs. Pilcus sessile or effuso-renexed, marginate. 



I. I. c KASsUh, B. and ('. I'ilei thick, corky, white, finely 

 pubescent, effu so- re flexed behind, and laterally concrescent. Teeth 

 lamcllately arranged, compressed, iine(|iial in length, concolorous. 



In woods upon trunks, not rare. I have seen it growing on a 

 standing trunk in an elongated mass of imbricated pilei several feet 

 in extent, after the manner of Ifydmiiii st/>tti/trii'ii(i/i'. The single 

 pilei are i^ to 2^ inches in width, and project an inch or two. The 

 lamellate arrangement of the teetli is very plain, those ne.xt the 

 margin are short, broad and flat, tliose fiirther behind are very long 

 and narrow, a half inch or more in length. This is one of the 

 most elegant species of this genus. 



