Ferns of British India and Ceylon. 139 



ing gradually into a short stem, the edge entire, the midrib rounded 

 on the back ; texture coriaceous ; veins fine and parallel, half a line 

 apart; sori reaching about half-way towards the margin. Lin. Sp. 

 PI. 1537. Hook. Syn. Fil. 190. Bedd. F. B. I. t. 197. 



North India ; the Malay Peninsula ; Ceylon. 



(Also pretty general throughout tropical Asia, Mauritius, 

 Madagascar, &c.) 



Typical Nidus has the fronds up to 6 feet long and 5-6 inches 

 wide, and has not been found in the Madras Presidency. 



Var. f3 mus.-efolia. (Mett) Fronds up to 6 feet long and 

 1 foot broad ; sori extending nearly to the margin. Mett. Asp. p. 85. 

 Hook. Sp. Fil. iii. 78. 



Malacca, Singapore. 



(Also in the Philippines.) 



Var. 7 phyllitidis. (Don.) Fronds up to 2 feet long and 

 2, rarely 3 inches broad. Don. Prod. Nep. 7. Hook. Sp. Ftl. iii. 80. 

 Bedd.F. S. I. t. 123. 



Western forests of the Madras Presidency, very common ; 

 Himalayas ; Khasya ; Malay Peninsula. 



(Also in Java Luzon, and Samar.) 



The above have been considered three different species by many 

 botanists, they are now generally all united under Nidus ; there 

 appears to be no real difference except as to size, and it is doubtful 

 if this is constant, or that the supposed varieties do not run into 

 each other. 



2. Thamnopteris Grevillei. (Wall.) Fronds 12-18 inches 

 long by 2-3 broad, lanceolate-spathulate, narrowed to an acute apex 

 and suddenly below to a broad wing to the stipe, which grows very 

 gradually narrower downwards, the margin entire ; texture coriaceous; 

 midrib keeled below ; veins nearly horizontal, those in the body of 

 the frond about \ line apart ; sori on most of them extending within 

 a short distance of the edge. Wall. Cat. 1036. Hook. Sp. Fil. iii. So. 

 Bedd. R /!. /. l. 66. 



