1925] 



BURT THE THELEPHORACEAE OF NORTH AMERICA. XIV 269 



cular surface, numerous and small cystidia confined to the 

 hymenial layer, and spores 12 X 6 y. form a distinctive group of 

 characters. 



Specimens examined: 

 Oregon: Blue Mt., C. L. Shear, 797, type. 



49. P. Ravenelii Cooke, Grevillea 8: 21. pi 124, / 12. 1879; 

 Sacc. Syll. Fung. 6: 643. 1888; Massee, Linn. Soc. Bot. Jour. 

 25: 150. 1889. 



Type: in Kew Herb. 



Fructifications broadly effused, adnate, thin, small pieces sepa- 

 rable when moistened, becoming pale pinkish buff to pinkish buff 

 in the herbarium, and somewhat cracked, the margin thinning 

 out; in section 100-300 y. thick, not colored, composed of erect 

 and densely interwoven hyaline hyphae and very numerous 

 cystidia in all regions of the fructifications and having a somewhat 

 layered arrangement in thick specimens; no gloeocystidia ; cystidia 

 heavily and coarsely incrusted, conical, with apex obtuse or 

 barely acute, 30-40 X 12-18 \l when deeply immersed, or 30 X 

 8-10 [l in the hymenium; spores white in a spore collection, even, 

 4-5 X 2-3 [l. 



Fructifications 2-8 cm. long, 1-3 cm. wide. 



On bark and wood of decaying logs of Quercus and other 

 frondose species. District of Columbia to Mexico, in the Island 

 of Guam, and in Japan. July to January. Frequent. 



P. Ravenelii is distinguished by its small spores, coarsely in- 

 crusted, short cystidia with broad base, and absence of gloeo- 

 cystidia. P. Roumeguerii is similar in aspect but becomes much 

 thicker and has longer, slenderer, and more taper-pointed 

 cystidia and is more distinctly layered. 



Specimens examined: 

 Exsiccati: Ravenel, Fungi Am., 720, under the name Corticium 



laeve; Ravenel, Fungi Car. 2: 39, under the name Corticium 



laeve. 

 District of Columbia: Takoma Park, C. L. Shear, 1345. 

 South Carolina: H. W. Ravenel, type (in Kew Herb.), and in 



Ravenel, Fungi Car. 2: 39. 

 Georgia: Darien, H. W. Ravenel, in Ravenel, Fungi Am., 720; 



