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Cincumali $ocieftj of Natural Hixlory. 



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 Hic kory 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 surfa< e, or are grouped in patches upon the firm 



membrane. It resembles most /'. ///,<//W//\, but the pores are very much 



larger. The pure w hite Color is very marked. 

 1 



i. superficial) distant, punctiform. 



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

 or palish ; the mycelium interwoven into a naked suIm oriaceous stratum. 

 Pores naked, superficial, commonly obsolete, punctiform. 



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

 embraced under this name many diflerent 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 hymenophora. 



The pores do not. a> 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 1. 1 ^3 : he describes it well, as follows: 

 "In hoc contextus tatus cdlulosus, incompletes poros format, eosque in- 

 cludit, unde totus fungus extus intusque vesiculosus ! " 



1. 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 induratits, Peck, 31st Report, p. 37, so that at pres- 

 ent there are but two described species. 



