species of North American Fungi. 433 



3 inches highj | inch thick, distinctly lateral, irregular, flexuous, 

 here and there of a very pale brick-red, mealy like the pileus, in- 

 crassated at the base. Hymenium, at least when dry, white or 

 pale rufous ; pores extremely minute. 



This has the habit of P. auriscalpium, P., but is a totally dif- 

 ferent species and certainly undescribed. Its very minute pale 

 pores, its friable substance like that of P. officinalis, and other 

 points will readily distinguish it. The whitewashed appearance 

 is not assumed at first. Young individuals are simply sericeo- 

 striate. It may be stated here that P. xalapensis, Berk., is 

 P. prolificans, Fr., and P. Caroliniensis, Berk. & Curt., P. bi- 

 formis, Fr. 



47. Polyporus (Pleuropus) mutabilis, n. s.* Pileo coriaceo 

 rigido flabeiliformi zonato luteo-albo, primum subtiliter sericeo 

 striato tomentoso demum glabrescente crebrizonato deorsum in 

 stipitem definite lateralem varise longitudinis angustato; poris 

 minimis albidis. Curt. no. 2256, 2858, 2859, 2943. On decayed 

 logs, Aug., South Carolina, H. W. Ravenel, Esq. 



Pileus yellowish white, coriaceous, tough and rigid, flabelliform 

 or spathulate, 2| inches broad and long, but varying greatly in 

 form and size, sometimes much elongated, at first minutely 

 tomentose and marked with raised silky lines, at length be- 

 coming smooth, concentrically zoned, the zones often depressed ; 

 narrowed behind into a stem varying from a few lines to 3 inches, 

 and about ^^rd of an inch thick ; margin very thin, lobed. Hyme- 

 nium whitish, pores very minute, punctiform, except where they 

 are lacerated or confluent. 



A very curious species nearly allied to P. dealbatus, but dif- 

 fering in many essential characters. Both occur in Cayenne, 

 unless the specimens transmitted by Dr. Montague have been 

 misinterpreted. It should be remembered that in those cases 

 where the stem is most elongated, it penetrates into the soft 



* Polyporus cervino-nitens, Schwein. ! MSS. Pileo flabeiliformi tenui 

 radiato-rugoso plicatove ligneo-coriaceo sublobato ceiTino-fulvo zonis cre- 

 bris obscurioribus sericeo-striato, hymenio contextuque subconcoloribus 

 dilutioribus, poris minimis. Surinam. Herb. Schweinitz. 



Pileus flabelliform, 2 inches high, above 2 inches broad, thin, of a hard 

 coriaceous substance, slightly lobed, attenuated behind into an obscure 

 stem, radiato-inigose or plicate, sericeo-striate, of a bright tawny fawn-colour 

 approaching to brick-red, with narrow darker zones, margin very thin. 

 Substance and the bordered hymenium paler, pores punctiform, very 

 minute. 



A very beautiful species, confounded in our paper in the Journal of the 

 Academy of Natural Sciences of Philadelphia, N.S. vol. ii. p. 278, with P. 

 modestus, Kze, which is however very near to P. affinis, if the specimen in 

 Weigelt's Exsiccata is rightly named. 



Jnn. Sf Mag. N. Hist. Ser. 2. Vol. xii. 30 



