[Vor. 7 
164 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Illustrations: Engl. & Prantl, Nat. Pflanzenfam. (1:1**): 
194. text f. 69, A-B; Hard, Mushrooms, 455. text f. 382, 
as S. versicolor. 
Type: type distribution in Weigelt Exs. 
Fructifieations eoriaceous, rigid, thin, wedge-shaped to um- 
bonate, sessile, often laterally concrescent, at first tomentose 
and drying tawny olive, at length with the tomentum becoming 
pale smoke-gray to whitish, disappearing more or less near the 
margin and in narrow zones and showing the glabrous, shining, 
hazel surface of the bared areas, the margin undulate and 
usually more or less lobed; in structure 300 y thick, with the 
intermediate layer composed of densely arranged, thick-walled, 
hyaline hyphae 4-43 1 in diameter; hymenium glabrous, even, 
usually drying pinkish buff; no setae, gloeocystidia, nor con- 
dueting organs; spores hyaline, even, flattened on one side, 
4-5 X 14-2 u, but few seen. 
Pileus usually 3-7 em. long, 2-6 cm. broad, sometimes much 
larger by lateral confluence. 
On dead branches, logs, and stumps of frondose species in 
the cases noted. A tropical species ranging northward to New 
York and Wisconsin and southward to Brazil. Occurs in the 
Philippine Islands and East Indies also, if S. concolor is a synonym. 
S. lobatum may be distinguished from the related S. fasciatum, 
S. versicolor, and S. radians by having a more or less lobate 
pileus which is also very thin, somewhat flexible, zonate on the 
upper side, with glabrous, shining hazel zones alternating with 
whitish tomentose zones of soft, matted hairs. No specimens 
of this species which I have examined have the pileus effuso- 
reflexed when young. Specimens of S. fasciatum occasionally 
have a somewhat lobate margin but the pileus is thicker, more 
heavily clothed with a tomentum which is more persistent than 
that of S. lobatum, and in its more northern stations where I 
have been able to observe the development, the young fructifica- 
tions are often effuso-reflexed at first. 
S. lobatum is primarily an American species described from 
collections made in Surinam, Dutch Guiana, but it seems prob- 
able that this species has a more extended geographical range 
through the tropical lands of the Eastern Hemisphere also. 
The recent colleetions in Philippine Islands, determined by 
