1916] 
BURT—THELEPHORACEAE OF NORTH AMERICA. VII 343 
17. S. lilacinum Burt, n. sp. 
Type: in Farlow Herb. and Burt Herb. 
Fruetifieation resupinate, effused, coriaceous, dry, adnate, 
velutinous, between lilae-gray and pallid smoke-gray, the 
margin adnate, fimbriate; in structure 
80-200» thick, with hyphae thin-walled, 22 
2-214 in diameter, somewhat colored S 
near the substratum, ascendine and in- 
terwoven and becoming hyaline towards 
the hymenium, finer, 114» in diameter, арт 
and bearing laterally probasidia, and a \ 
extending beyond the probasidia and Fig. 14 
branching, with tips curved to form the 
velvety surface of the hymenium; proba-  hypha in hymenial sur- 
АР А 4 А face bearing а probasidi- 
sidia hyaline, even, globose, up to 94 in um; a, mature probasidi- 
diameter; spores simple, hyaline, even, съ ДЫ dar cr 
slightly curved, 11-13 X 31⁄—41⁄;u, borne gan; b, spore-bearing or- 
on a few-celled, spore-bearing organ 8% $ spores. x 640. 
about 20-30 X 4—би, slightly curved at first. 
Fruetifieations more than 6 em. long, more than 115 em. 
wide. 
On bark, Maravals, Trinidad, West Indies. 
This species is characterized by its very thin, velvety fruc- 
tifieation, pallid smoke-gray with a slight lilae tint, fine 
hyphae, and small probasidia, spore-bearing organs, and 
spores. The spore-bearing organs were slightly curved in 
all cases where spores were attached to them; in the sec- 
tions some of these organs appeared strongly eurved or hook- 
shaped but my preparations did not demonstrate this point 
positively, for the numerous curved hyphal branches were 
confusing. 
Specimens examined: 
Trinidad: Maravals, H. Thaxter, comm. by W. G. Farlow, 
28, type. 
(To be continued.) 
