[Vor. 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 y thick exclusive of the tomentum, with the 
occasional hymenial wrinkles standing out up to 120 y 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 u 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 y. 
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 em. 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). 
