174 Cincinnati Society of Natural History. 



catalogue; I have never met with anything I could so refer. The original 

 habitat, given by Schweinitz, is on the fibrous inner bark of Chestnut. 



85. P. canDidissimus, Schw. Effused; the mycelium, a very thin, 

 bombycine, but separable membrane. Pores very large, at length oblique, 

 and with the membrane pure white. 



In woods on the bark of an old Hickory log, effused for many feet. 

 At first, when fresh and growing, quite soft and fleshy ; the pores very 

 large and angular, at first shallow, lengthen and become oblique. The 

 pores present an uneven surface, or are grouped in patches upon the firm 

 membrane. It resembles most P. moHuscus, but the pores are very much 

 larger. The pure white color is very marked. 



•/. superficial., distant., punctifortn. 



86. P. coRTicoLA, Fr. Very broadly effused, equable, firm, white 

 or palish ; the mycelium interwoven into a naked subcoriaceous stratum. 

 Pores naked, superficial, commonly obsolete, punctiform. 



Upon barks. On account of their habit altogether similar, there are 

 embraced under this name many different forms. Perhaps all are only 

 degenerations of other species ; the substerile pores differ greatly in the 

 degree of their evolution. 



GENUS II.=- MYRIADOPORUS, Peck. 



Hymenium cellular, porous. Pores of the surface shallow, open . 

 the others imbedded in the hymenium, variously directed, short, closed, 

 inseparable from each other, and from the hymenophor*;- 



The pores do not, as in Polyporus, form vertical parallel tubes, but 

 rather cells or short tubes variously directed, so that a vertical section of 

 the hymenium, as well as a horizontal one, is porous. Fries mentions 

 such a structure in the Elenchus I, 123 ; he describes it well, as follows: 

 '•In hoc contextus t|tus cellidosus, incompletes poros format, eo.sque in- 

 cludit, unde totus fungus e.xtus intusque vesiculosus ! " 



I. M. ADUSTUS, Peck. Resupinate, effused, thick, subcoriaceous, 

 uneven ; the subiculum thin, floccose, whitish. Hymenium thick, gray, 

 ish black externally, varying to whitish internally, substratose; pores or 

 cells minute, roundish, unequal. 



In woods on the underside of an old trunk. Effused to the extent 

 of several inches, about 2 mm. in thickness, the hymenium occupying 

 much the larger part of the thickness. The genus is founded upon this 

 species and Polyporus induratus, Peck, 31st Report, p. 37, so that at pres- 

 ent there are but two described species. 



