1917] 



BURT THELEPHORACEAE OF NORTH AMERICA. VIII 



253 





On white oak bark. Lake Geneva, Wisconsin. July. 



This collection was at first referred to C olivascens, but it 

 differs from it in having no olivaceous component in its color, 

 and its spores are subglobose and slightly subangular and its 

 hyphae not nodose-septate. The fructifications are suggestive 

 of Corticium arachnoideum in forming a delicate hymenial 

 pellicle which is supported on a very thin and loose subicu- 

 lum, but the hymenium and the spores are colored. 



Specimens examined: 

 Wisconsin: Lake Geneva, E. T. S S. A. Harper, 958, type. 



11. C. dryina (Berk. & Curtis) Massee, Linn. Soc. Bot. 

 Jour. 25 : 135. 1889. 



Corticium dryinum Berk. & Curtis, Grevillea 1 : 179. 1873 ; 

 Sacc. Syll. Fung. 6 : 634. 1888. 



Type : type and cotype in Kew Herb, and 

 Curtis Herb, respectively. 



Fructification effused, thick, dry, adnate, 

 velvety, drying snuff-brown both externally 

 and within; hymenium even, velvety; in 

 structure 500-1000 n thick with (1) next 

 to the substratum a thin layer composed 

 of closely interwoven, thick-walled, rigid 

 hyphae 4-4i/^ y. in diameter, nodose-septate, 

 not incrusted, concolorous with the fructi- 

 fication, and with (2) a broad stratose hy- 

 menial layer made up of about 4 or 5 sets 

 of hymenia and supporting subhymenial 

 layers whose hyphae are erect, branching, 

 concolorous, 4-41/2 At in diameter; no cys- 

 tidia ; basidia colored like the fructification, with 4 sterigmata ; 

 spores concolorous with the fructification, even, curved, 

 pointed at the place of attachment, 8-9x3Vi>-4 /*. 



Fructification probably large, in the specimens known being 

 about 4 cm. long, 3 cm. broad, and not having the original 

 margin. 



On rough surface of decaying oak wood. Alabama. No- 

 vember. 



Fig. 11 

 C. dryina. 

 Section of fructifica- 

 tion showing stratose 

 structure X45; 

 spores X 665. 



