(Vol. 7 

 180 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Fructifications coriaceous, orbicular, and attached by the 

 center, or fan-shaped and laterally confluent, lobed, the upper 

 surface velvety hirsute on the region of recent growth, becoming 

 somewhat glabrous in the older region near place of attachment, 

 narrowly concentrically sulcate, somewhat zonate, snuff-brown, 

 becoming Saccardo's umber; hymenium even, Saccardo's umber 

 to drab, somewhat pruinose; in structure 600-800 yu thick, with 

 the intermediate layer connected with the hairy covering by a 

 blackish dense crust; hyphae of intermediate layer snuff-brown, 

 blackening by action of dilute potassium hydrate, longitudinally 

 arranged, thick-walled, 3|-4 p. in diameter; hymenial layer 

 simple; no colored conducting organs, cystidia, nor aculeate 

 paraphyses; spores hyaline, even, 4-5X2^-3 ix. 



Pileus 2-5 cm. in diameter. 



On logs. Cuba and Jamaica. October and November. 

 Rare. 



S. vibrans is related to S. crassum but seems distinct by having 

 smaller spores and a thin, blackish, horn-like crust under the 

 hairy covering; the other histological details are very similar 

 how^ever. S. vibrans may be distinguished from the other 

 species of the West Indies by its tobacco color, pruinose hymen- 

 ium, and lack of cystidia, gloeocystidia, conducting organs, 

 and bottle-brush paraphyses. S. papyrinum is of similar colora- 

 tion, but is more spongy, has incrusted cystidia, and does not 

 have its intermediate layer bordered above by a crust. 



Specimens examined: 

 Cuba: C. Wright, 530, type (in Curtis Herb.). 

 Jamaica: Rose Hill, F. S. Earle, 299, 303, comm. by N. Y. Bot. 

 Gard. Herb. 



52. S. crassum Fries, R. Soc. Sci. Upsal. Actis III. i: IIL 

 1851 (not Thelephora crassa Leveille); Sacc. Syll. Fung. 6: 582. 

 1888. 



Type: in Herb. Fries. 



Fructification coriaceous, resupinate, effused, sometimes re- 

 flexed, villose, blackening, the margin obtuse, determinate, 

 paler; hymenium even, dark chestnut-brown; in structure 1000 

 n thick, with intermediate layer not bordered by a darker denser 

 zone or crust, composed of longitudinally and rather loosely 



