1920] 



BURT THELEPHORACEAE OF NORTH AMERICA. XII 235 



umbo prolonged into stem-like form. Such fructifications occur 

 rarely and are perplexing if not gathered in the same collection 

 with the usual sessile fructifications. 



S. ochroleucum Fries, Hym. Eur. 639. 1874; Sacc. Syll. 

 Fung. 6: 562. 1888; Massee, Linn. Soc. Bot. Jour. 27: 184. 

 1890. 



Corticium ochroleucum Fries, Epicr. 557. 1838. Not Stereum 

 ochroleucum Bres. Ann. Myc. 1: 91. 1903, nor Brinkmann, 

 Westfalische Pilze, 49. 



Type: authentic specimen in Kew Herb. 



This species does not occur in North America and adjacent 

 regions although reported from time to time from United States, 

 Cuba, and Venezuela. Since I have not received under any 

 name specimens of the true Stereum ochroleucum from European 

 correspondents, this species is probably rare in Europe, and it 

 may help toward recognition of the species to call attention to 

 the specimen in Kew Herbarium. 



The specimen is labelled: 



" Corticium ochroleucum Fr. 

 Svex. Westm. 

 Maji leg. Lbd." 



This specimen agrees well with the original description; its 

 reflexed portion is If cm. broad, about 1-1 1/5 mm. thick as the 

 sections show in my preparation; the consistency is soft in com- 

 parison with S. hirsutum and the hyphae about 2\ mm. in 

 diameter, granule-incrusted, and interwoven throughout the 

 thickness of the pileus rather than parallel and longitudinally 

 arranged side by side as in S. hirsutum and S. sulphuratum. In 

 other words there is not the sharply marked intermediate layer 

 which Fries regarded as an important distinctive character of 

 the genus Stereum, and this is probably the reason for his orig- 

 inally regarding this species as a Corticium although broadly 

 reflexed. There is not present a hardened crust or golden zone 

 to mark the upper side of the intermediate region, but instead 

 the hyphae become more loosely arranged toward the surface and 

 become the hairy covering of that side. No cystidia, gloeo- 

 cystidia, nor colored conducting organs are present; the spores 

 are hyaline, even, 4-5 X 3 /*. 



