liUfiJ 



BURT THELEPHOKACEAE OF NORTH AMERICA. VII 343 



17. S. lilacinum Burt, n. sp. 



Type : in Farlow Herb, and Burt Herb. 



Fructification resupinate, effused, coriaceous, dry, adnate, 

 velutinous, between lilac-gray and pallid smoke-gray, the 

 margin adnate, fimbriate; in structure 

 80-200/A thick, with hyphae thin-walled, 

 2-214/x in diameter, somewhat colored 

 near the substratum, ascending and in- 

 terwoven and becoming hyaline towards 

 the hymenium, finer, II/^/a in diameter, 

 and bearing laterally probasidia, and 

 extending beyond the probasidia and ^'^g- 14 



branching, with tips curved to form the ^^ hyanoe''portion of 

 velvety surface of the hymenium ; proba- hypha in hymeniai sur- 



. T 1 T 11 J. n • ^^^^ bearing a probasidi- 



sidia hyaline, even, globose, up to 9/x m um; a, mature probasidi- 

 diameter: spores simple, hyaline, even, "™' «» probasidium with 



' ^ . , young spore-bearmg or- 



Slightly curved, 11-13 X 31/2-41/21"., borne gan; b, spore-bearing or- 



011 a few-celled, spore-bearing organ ^^^ ' *' ^p*^^^^- ^ ^*^- 

 about 20-30 X 4-5/x, slightly curved at first. 



Fructifications more than 6 cm. long, more than li/o cm. 

 wide. 



On bark, Maravals, Trinidad, West Indies. 



This species is characterized by its very thin, velvety fruc- 

 tification, pallid smoke-gray with a slight lilac tint, fine 

 hyphae, and small probasidia, spore-bearing organs, and 

 spores. The spore-bearing organs were slightly curved in 

 all cases where sjDores were attached to them; in the sec- 

 tions some of these organs appeared strongly curved or hook- 

 shaped but my preparations did not demonstrate this point 

 positively, for the numerous curved hyplial branches were 

 confusing. 



Specimens examined: 

 Trinidad: Maravals, R. Thaxter, comm. by W. G. Farlow, 



28, type. 



(To be continued.) 



