[Vol. 7 



178 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Mexico: Jalapa, W. A. & E. L. Murrill, 343 in part, comm. 

 by N. Y. Bot. Gard. Herb, (in Mo. Bot. Gard. Herb., 56672). 



49. S. pubescens Burt, n. sp. Plate 5, fig. 50. 



Type: in Mo. Bot. Gard. Herb., N. Y. Bot. Gard. Herb., and 

 Burt. Herb. 



Fructification coriaceous, thin, orbicular, conchate-reflexed, 

 attached by one side and the center, reflexed all around but more 

 broadly on the upper side, white, pubescent with soft matted 

 hairs, not zonate nor sulcate; hymenium drying even or some- 

 what radiately rugose, sorghum-brown to dusky drab, shining; 

 in structure 600 /x thick exclusive of the tomentum, with the 

 occasional hymenial wrinkles standing out up to 120 /x further; 

 intermediate layer bordered next to the tomentum by a narrow, 

 dense, colored zone and composed of longitudinally arranged 

 and somewhat loosely interwoven hyaline, thick-walled hyphae 

 3| fx in diameter; no vesicular organs, conducting organs, 

 gloeocystidia, nor cystidia present; hymenium composed of a 

 single layer of simple basidia with 4 sterigmata; spores hyaline, 

 even, oval, 6X4 /x. 



Fructifications 3-10 mm. in diameter, reflexed 1-3 mm. 



On dead limbs of a frondose species. Montana. April. 

 Probably rare. 



S. pubescens has small fructifications with some resemblance 

 in aspect to those of Cenangium furfuraceum but white and 

 pubescent with soft matted hairs. Specimens from this gather- 

 ing were communicated by Ellis, No. 7014, to Cooke and were 

 regarded by Cooke as a young Stereum, related to Stereum 

 purpureum and, perhaps, young specimens of this species. S. 

 pubescens differs sharply from S. purpureum in having no pyri- 

 form, vesicular organs. The specimens are so mature that 

 many basidia bearing sterigmata are present and occasionally 

 spores. In the smaller specimens the hymenium is even but 

 in those 1 cm. in diameter some broad, obtuse, radiating wrinkles 

 are present, which may necessitate the transfer of this species 

 from Stereum when better known from future collections. 



Specimens examined: 

 Montana: Sheridan, Mrs. L. A. Fitch, in Ellis Collection, 7014, 

 type (in N. Y. Bot. Gard. Herb, and Mo. Bot. Gard. Herb., 

 56784). 



