Additions to the Mycological Herbarium 219 



species, unadapted to tropical conditions generally, as is the case 

 with many of our common higher plants. 



The first boletus reported from tropical America was collected 

 by Oersted in volcanic soil on the Irasi volcano, Costa Rica, and 

 described by Fries in 1851 as Boletus robustus. In 1868, two 

 species, B. cubensis and B. lignatilis, were described by Berkeley 

 from the collections of Wright in Cuba. In 1900, Patouillard 

 described B. guadalupensis from specimens collected by Pere 

 Duss in Guadeloupe, During the past winter I found Rost- 

 kovites granulatus quite common at Cinchona, Jamaica; and two 

 collections of Ceriomyces communis have recently been sent in 

 from the Bahamas. A new species, collected in Costa Rica by 

 Mr. Maxon, may be characterized as follows : 



Ceriomyces Maxoni sp. nov. 



Pileus irregularly circular in outline, convex, slightly depressed, 

 7 cm. broad, 1—1.5 cm - thick; surface glabrous, smooth, very 

 dark brown, almost black near the margin, slightly lighter at 

 the center with dark blotches, margin undulate, involute : context 

 very fleshy ; hymenium strongly concave, pure creamy white, tubes 

 adnate, rather short, small, angular, thin-walled, edges becoming 

 lacerate: spores oblong-ellipsoid, smooth, hyaline, 2-guttulate, 

 9-1 1 X 3-4 ' stipe central, thick, tapering downward, 2.5 cm. 

 long, 3 cm. thick at the apex, 1.5 cm. thick at the base, smooth and 

 glabrous below, closely and conspicuously reticulate above, fleshy, 

 solid. 



Type collected near Coliblanco, on the slopes of the volcano 

 Turrialba, Costa Rica, at approximately 2,000 meters, among 

 mosses on a rotten log in a clearing in the forest, May 1, 1906, 

 W. R. Maxon 301. 



W. A. MURRILL. 



