я [Yor, 8 
326 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Louisiana: Gibson, F. T. McLean, comm. by P. Spaulding. 
3. S.tropicale Burt, n. sp. 
Type: in Mo. Bot. Gard. Herb. and in Farlow Herb. 
Fruetifieation resupinate, effused, coriaceous, dry, not sep- 
arable from substratum, glabrous, not shining, avellaneous, 
the margin concolorous, squamulose-fimbriate, not closely ad- 
nate; in structure 3-layered, 
with (1) a layer next to 
the substratum of dense- 
ly interwoven, concolorous, 
thick-walled hyphae 3-314. 
in diameter, which pass into 
and form (2) a layer of nu- 
merous erect, slender pillars 
about 40и in diameter, 5 or 
6 to the millimeter, whose 
hyphae spread apart at the 
outer end, branch, and form 
8. cale. 
a, probasidium ; T io spore- пра and support (3) the hyme- 
EE а и nial crust about 200, thick, 
densely interwoven through- 
out, with the even, thick-walled, colored hyphae up to би in 
diameter on the under side, more erect, paler, and about 2p 
in diameter at the surface; probasidia terminal on the hy- 
phae, hyaline or but slightly colored, pyriform, 26 X Пр, at 
the surface of the hymenium; a spore partially imbedded 
in the hymenium is hyaline, simple, even, curved, 19 X би, 
no others seen; fish-hook-shaped organs, such аз probably 
bear the spores, are present in the surfaee of the hymenium, 
several-celled, up to 50 X 8», with prominent protuberances 
from cells on the convex side of the organ. 
Fructification 4 em. long, about 2 em. broad, 1-115 mm. 
thick. 
On bark of living branches of Quercus. Mexico. 
The distinctive characters of this species are avellaneous 
color, surface not shining, margin squamulose-fimbriate, not 
closely adnate as in the preceding species, and thicker hy- 
