1919] 



BURT THELEPHORACEAE OF NORTH AMERICA. XI 



257 



portions being separated from the substratum, but they are not 

 adnate, for upon moistening the fructification small portions 

 large enough for preparation under a cover glass may be lifted 

 from the substratum with the point of a scalpel. 



It seems probable that Corticium incarnatum var. pinicolum 

 Tul. must have been either the present species or T. Eichleriana, 

 on account of the subglobose spores which the Tulasnes figured, 

 although unfortunately without stating spore dimensions or 

 scale of magnification of their figures. 



Von Hohnel & Litschauer have published^ that Corticium 

 roseolum Karst. is the same species as Tulasnella Tulasnei. 

 I have studied an authentic specimen of C. roseolum communi- 

 cated to me by Karsten; this species is not distinguishable in 



Fig. 2. T. violea. Young basidium, y; young basidium, a, 

 forming sterigmata; basidium, h, with nearly full-grown sterig- 

 mata; old, collapsed basidium, c, from whose sterigmata the 

 spores have fallen; spores, s. X 870. From specimen deter- 

 mined by Quelet. 



coloration and aspect from several sendings of T. Tulasnei 

 i = T. violea), also on Betula, received from Romell and cited 

 below, but it is entirely different in microscopic characters. 

 This specimen of C. roseolum agrees well with the description 

 published by Karsten; its spores are hyaline, even, 4-6X3-3| /i, 

 borne 4 to a basidium on very slender sterigmata of the usual 

 Corticium kind; the basidia are simple, cylindric or clavate, 

 9-10X4-41 fj.; the hyphae are sometimes nodose-septate, and 

 some are incrusted in the region of the substratum. Karsten's 

 publication of Corticium roseolum antedates that by Massee and 

 renders unnecessary Corticium subroseum Sacc. & Syd. in 

 Sacc. Syll. Fung. 14: 223. 1899. 



1 K. Akad. Wiss. Wien, Sitzungsber. 115: 1557. 1906. 



