CHAEACTBES OF TEIBES AND GENERA. 109 



Fertile pinnas linear, 6 to 8 inches long-, broad raohiform. 

 Primary veins evident, short. Receptacles compital, forming 

 a large quadrate sorus, in two transverse, nearly confluent 

 rows on each, segment (acrosticlioid). 



Type. Drijostachyu'in spleiidcns, J. Sin. 



Illust. Hook, and Bauer, Gen, Fil., t, 95 ; Moore Ind. 

 Fil., p. 10, A. 



Obs. — As a genus, this is distinguished from Drijnaria 

 by the upper portion of the frond being contracted into 

 long linear sessile pinnas, bearing large quadrangular sori. 

 The receptacle of each sorus may be viewed as formed by 

 the confluence of four (normal) punctiform receptacles, 

 brought tog-ether by the contraction of the fertile disk, 

 forming a broad sporangiferous area between each two of 

 the primary veins, the sporangia thus foi-ming two rows of 

 squares on each pinnos. According to Mr. Moore's classifi- 

 cation, the seeming-ly amorphous sori leads him to place 

 this genus in AerosticJiece, but he admits that in habit and 

 aspect it resembles DrynaHa. 



Sp. D. splendens, /. Sm. (BedcL F. Brit. Ind. pi. 316) ; 

 D. pilosum, /. Sm. 



Obs. — First discovered in the Island of Luzon, by 

 Cumings, and latterly in Singapore. I>. pilosum is a much 

 smaller plant than JD. splendens, and is specially distin- 

 guished by the sporangia being pilose. 



24. Aglaomorbha, Schott. (1835). 



Psygmiam, Presl, 1836 ; Polypodlum sp., Hook. Sp. Fil. 



Siircvdum thick. Fronds sessile (the base dilated), rigid, 

 2 to 3 feet long, pinnatifid and sterile below ; pinnate, 

 contracted, and fertile above. Veins of sterile segment 

 cost^form ; veinlets and venules compound anaatomoaing, 



