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 II. POLYPODIACE^: 



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 Hymenophylleae). 



(A) Involucrata 



Sori furnished with an indusium (except in 

 Alsophila). 



TRIBE I. CYATHE^ 



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 II. CYATHEA. 



(Deriv. Gr. Kyathos, a cup in allusion to 

 the indusium.) 



