29 
Mountains of Southern India and Ceylon, 
up to 6,000 feet; Sikkim; Bhotan; Nepal; 
Kumaon; Khasya, etc. up to 5,000 feet; 
Malay Peninsula.—Japan ; Tropical Australia ; 
America; Polynesia. 
SUB-ORDER IL—POLYPODIACEZ 
Sori dorsal or marginal with or without an 
indusium; sporangia stalked, provided with a 
vertical more or less complete ring and opening 
transversely (except in Hymenophyllez). 
(A) Involucrate 
Sori furnished with an indusium (except in 
Alsophila). 
Tripe [.—CvyatHe® 
Tree-ferns—Sori dorsal, round; sporangia 
stalked or ‘sessile on an elevated receptacle ; 
indusium inferior, in the form of a scale 
beneath the sorus, or completely enveloping 
the sorus, ultimately bursting at the top and 
. forming a cup. It is absent in Alsophila. 
Genus I].—CyatHEAa 
(Deriv. Gr. Kyathos, a cup—in allusion to 
the indusium.) 
