36 Murrill: Polyporaceae of North America 



plane, 1.5-2.5 x 0.03-0.08 cm.; surface minutely tomentose, radi- 

 ate-rugose, isabelline, fulvous at the center ; margin straight or 

 repand, even, glabrous, entirely devoid of teeth or cilia : context 

 0.2-0.7 mm. thick, tough, white, translucent, especially near the 

 margin; tubes o. i mm. long, 8 to a mm., adnate, white, cylin- 

 drical, regular, edges thick, entire ; spores ovoid, smooth, hyaline, 

 3.5-4x4.5-5/^: stipe central, tough, elastic, slender, equal, 

 chestnut-colored, glabrous, smooth, much compressed in drying, 

 2—4 cm. long, 1—2 mm. thick. 



The above description of this species is made from dried plants 

 now in the herbarium of the New York Botanical Garden, col- 

 lected by C. L. Smith in Nicaragua. 



Type plants kindly furnished me by Macbride agree in all re- 

 spects with these, being a part of the same collection. The spe- 

 cies is nearly related to P. TricJwloma, but the pileus is very thin 

 and translucent, the margin entirely glabrous and the pores 

 scarcely one eighth of a millimeter in diameter. 



14. Polyporus aemulans B. & C. Jour. Linn. Soc. 

 Bot. 10: 304. 1868. 

 Very little is known of this species beyond the small type col- 

 lection from Cuba and Berkeley's rather meager description. The 

 types are well preserved, however, and show decided characters. 

 They resemble/', arcidaruis in having alveolar tubes, but these tubes 

 are broad and shallow and disappear near the margin, leaving a 

 sterile marginal band one or two millimeters in diameter. In 

 habit, the species resembles P. Polyporus. The whole plant is thin 

 and tough, with brown central stipe. 



15. Polyporus arculariellus nom. nov. 



Favoliis Qertisii Berk. Grevillea, i: 68. 1872. 



One specimen only of this plant seems to have been sent to 

 Kew by Curtis from his North Carolina collections. This is well 

 preserved, however, and shows the very thin pellucid pileus orna- 

 mented around the margin with long cilia, the oblong favoloid 

 tubes and the centrally attached tapering stipe that characterize 

 the species. It is a near ally of Polyp07'iis aradarins, though 

 smaller and much more delicate, and also closely resembles such 

 ciliated forms as P. TriclioloDia and its near allies ; so that its nat- 

 ural affinities appear to be with Polyporus rather than with Favo- 



