1926] 



BURT THELEPHORACEAE OF NORTH AMERICA. XV 335 



1 or 1.5 mm. ; color a pallid creamy yellow or dusky cream ; surface 

 glabrous, shining unless getting rather dry. Texture succulent 

 but not gelatinous in the usual sense, but firmly waxy. Fibers 

 of the flesh slender and regular, about 1.5-2 y. thick, sparingly 

 branched. 



" Spores oval, flattened on one side, yellowish under micro- 

 scope, very variable in size, 6.3-9 X 7.7-12.2 \l, sprouting into 

 threads by one or two germ tubes, which may arise at any point. 

 Basidia oval, 13.7-14.4 X 16.3 n, irregularly four-celled, col- 

 lapsing soon after formation of spores. Sterigmata much thick- 

 ened upward, some very long and slender. Paraphyses slender, 

 densely packed, curved over, and mostly branched a little at the 

 ends, the branches crooked and rhizoid-like and more slender and 

 set with very minute crystals. Much larger, roughly globular or 

 angular crystals with slender, spine-like, hyaline projections also 

 occur rather abundantly through the hymenium; they are mostly 

 about 7-9 (A thick. 



"This species is markedly distinct from all others we have 

 seen. The peculiar color, pustulate, anastomosing form and 

 plump spores and large crystals separate it easily from our other 

 Sebacinas. The projections on the crystals do not seem to be of 

 the same nature and after drying reappear very obscurely if at 

 all. They may be the stubs of hyphae that took part in the 

 formation of the crystals. So thickly interwoven are the tips of 

 the paraphyses and so dense the little crystals that there is 

 formed a distinct and darker crust over the surface." 



The thickest portion of the fructification has dried Dresden 

 brown. 



Specimens examined : 

 North Carolina: Chapel Hill, on under side of old, hard heart of 



an oak branch, February, W. C. Coker, 4116, type (in Mo. Bot. 



Gard. Herb., 56719). 



S. fibrillosa Burt, n. sp. 



Type: in Mo. Bot. Gard. Herb, and N. Y. Bot. Gard. Herb. 



Fructifications effused, incrusting, adnate, rather thin, fibril- 

 lose-hypochnoid, drying whitish, somewhat velutinous, surface 

 irregular and conforming to the elevations and depressions of the 



