1924) 



BURT THE THELEPHORACEAE OF NORTH AMERICA. XIII 35 



crowded stellate organs of varying size; stellate organs with 

 unbranched rays 20-60 X 3-6 y. which protrude beyond the 

 hymenium in such great numbers and so crowded as to nearly 

 conceal the basidia; no cystidia found; basidia simple, 10 X 5 ^, 

 with 4 sterigmata, but few basidia found; floating spores in each 

 preparation are hyaline, even, 4-43^ X 3 (i, neither copious nor 

 seen attached to basidia. 



Fructifications 1-13^ mm. long, about J^j mm. broad. 



On bark and decorticated wood of Abies. New Hampshire. 

 September. 



A. ochrostroma differs from all other species of Asterostroma 

 known to me by the presence in its subiculum of some slender, 

 rigid, thick-walled hyphae of the same diameter as the usual, 

 thin-walled hyphae but of the same color as the stellate organs. 

 I find these colored hyphae more abundant in the sterile portions 

 of the fructification; they have bleached in sections preserved 

 for several years in glycerine mounts. The stellate organs are 

 more numerous than in any other of our species and prevent 

 cutting satisfactorily thin sections of the hymenium by free hand. 

 Some hyaline, even spores 4-4J^ X 3 y. were found floating in 

 each preparation but not abundantly and are probably the 

 spores of this species. 



Specimens examined: 

 New Hampshire: Crystal Cascade, White Mts., W. G. Farlow, 



1, type (in Mo. Bot. Gard. Herb., 55578). 



{To be continued) 



