326 



[Vol. 3 



ANNALS OF THE MISSOUKI BOTANICAL GARDEN 



Louisiana: Gibson, F. T. McLean, comm. by P. Spanlding. 



3. S. tropicaJe Burt, n. sp. 



Type: in Mo. Bot. Gard. Herb, and in Farlow Herb. 

 Fructification 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 3-3%/tA 

 in diameter, which pass into 

 and form (2) a layer of nu- 

 merous erect, slender pillars 

 about 40/A in diameter, 5 or 

 6 to the millimeter, whose 

 hyphae spread apart at the 

 outer end, branch, and form 

 and support (3) the hyme- 

 nial crust about 200/* thick, 

 densely interwoven through- 

 out, with the even, thick-walled, colored hyphae up to 6/a in 

 diameter on the under side, more erect, paler, and about 2/* 

 in diameter at the surface; probasidia terminal on the hy- 

 phae, hyaline or but slightly colored, pyriform, 26 X H/*, at 

 the surface of the hymenium; a spore partially imbedded 

 in the hymenium is hyaline, simple, even, curved, 19 X 6/*, 

 no others seen; fish-hook-shaped organs, such as probably 

 bear the spores, are present in the surface of the hymenium, 

 several-celled, up to 50 X 8/a, with prominent protuberances 

 from cells on the convex side of the organ. 



Fructification 4 cm. long, about 2 cm. broad, 1-1 1/2 nim. 

 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- 



Fig. 2 



S. tropicale. 

 a, probasidium ; h, two spore-bearing 

 organs; s, spore; p, paraphysis. X 

 640. 



