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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



Habitat: On trunks and branches of trees, moist rocks, and the base of 

 sandstone escarpments, in forests at higher elevations. 



JAMAICA: Fairy Glade, Mt. Horeb, 4500 ft, M. Fan 775 (I.J). 



VENEZUELA: Estado Amazonas: Rio Cunucunuma, Ccrro Duida near Cafio Culebra, 

 1700-1800 m, Maguire, Cowan & Wurdack 20715 (NY); Cafio de Dios, Cumbre, 1900 m, 

 Maguire, Cowan & Wurdack, 30276 (NY), sw escarpment, 1850 m, Maguire, Cowan & Wurdack 

 30301 (NY). Estado Bolivar: Ptari-tepui, 2410 m, Sleyermark 69890 (F) ; Chimanta Massif, 

 central section nr "Summit Camp," 1925 m, Steyermark & Wurdack 318 (NY) ; Torono-tepui, 

 summit, 2165-2180 m, Sleyermark & Wurdack 687 (NY) ; Abacapa-tepui, 1300 m, Steyermark 

 75216 -p.p. (NY), at 1800-2000 m, Steyermark 74981 p.p. (NY) ; se Cerro Venamo, Rio Venamo, 

 1000 m, Steyermark & Dunsterville 92243 p.p. (VEN) ; nr escarpment, 1400-1575 m, Steyermark 

 & Dunsterville 92542 p.p., 92547 ; Auyan-tepui: e of Salto Churun, 1850 m, Steyermark 93426, 

 93428 (NY) ; Sierra Ichun. 625-725 m, Sleyermark 90294 (VEN). 



PERU: Eastern Andes, 1000 m, Spruce, Hep. Sprue, (isotypes G, NY;. 



This genus is obviously closely related to Micropterygium, but is distinguished 

 from it because of the distinctive form of the leaves, the regular pattern of the 

 quadrate cells with rough-warty cuticle, the absence of underleaves, and the 

 absence of lateral branches. 



