[Vol. 3 



330 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



5. S. castaneum Burt, n. sp. 

 Type: in Mo. Bot. Gard. Herb. 



Fructification resupinate, effused, coriaceous, dry, not sep- 

 arable from tlie substratum, glabrous, cracking in drying 

 into pieces about 10 X 5 mm., olive-brown when fertile, Van- 

 dyke brown wlien in vegetative condition, the margin con- 

 colorous; in structure 3-layered, with (1) a layer next to 

 substratum of opaque, concolorous hyphae 4/i in diameter, 

 which form (2) a layer of pillared or spongy structure, in 

 some places wdth pillars up to 150/x in diameter, about 1 mm. 

 apart, and in other places with a spongy mass of obliquely 

 ascending, interwoven liyphae similar to those of the pillars. 



This layer supports (3) the 

 hymenial crust, sometimes 

 stratose, with hyphae loosely 

 interwoven on the under 

 side, 3-4)u, in diameter, very 

 dense at the outer surface, 

 with the hyphal branches or 

 i:)araphyses 2fi in diameter, 

 curved longitudinally along 

 the surface and densely in- 

 terwoven ; erect probasidia 

 slightly colored, rich in pro- 

 toplasm, deeply staining, 

 pyriform, 11-15 X 9-10/x, 

 are borne laterally on the hyphae about 15/* below the surface 

 of the hymenium ; spores hyaline, simple, even, curved, 12 X 

 3-3i/2iu., borne singly from each of the upper four cells of a 

 straight, few-celled, even-walled, clavate, hyaline organ 30-40 

 X 6/t, which grows from the probasidium and protrudes above 

 the surface of the hymenium. 



Fructification 8-15 cm. long, wholly surrounding limbs 

 21/2 cm. in diameter, I-I14 mm. thick. 



On living bark in swamp, Montgomery, Alabama. May 

 and August — fertile in May. 



S. castaneum. 

 a, two probasidia, one persistent at 

 base of the spore-bearing organ -which 

 grows from it; b, six spore-bearing or- 

 gans; s, spores. X 640. 



