[Vol. 7 

 164 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Illustrations: Engl. & Prantl, Nat. Pflanzenfam. (i: 1**): 

 124. text f. 69, A-B; Hard, Mushrooms, 455. text f. 382, 

 as S. versicolor. 



Type: type distribution in Weigelt Exs. 



Fructifications coriaceous, 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 m thick, with the 

 intermediate layer composed of densely arranged, thick-walled, 

 hyaline hyphae 4-4| m in diameter; hymenium glabrous, even, 

 usually drying pinkish buff; no setae, gloeocystidia, nor con- 

 ducting organs; spores hyaline, even, flattened on one side, 

 4-5Xl2~2 hi, but few seen. 



Pileus usually 3-7 cm. 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 w^hich 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 efTuso-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 collections in Philippine Islands, determined by 



