CHARACTERS OF TRIBES AND GENERA. 109 



Fertile pinnae linear, 6 to 8 inches long, broad rachiform. 

 Primary veins evident, short. Receptacles compital, forming 

 a large quadrate sorus, in two transverse, nearly confluent 

 rows on each segment (acrostichoid). 



Type. Dryostachyum splendens, J. Sin. 



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

 Fil., p. 10, A. 



OBS. As a genus, this is distinguished from Drynaria 

 by the upper portion of the frond being contracted into 

 long linear sessile pinnae, bearing large quadrangular sori. 

 The receptacle of each sorus may be viewed as formed by 

 the confluence of four (normal) punctiform receptacles, 

 brought together by the contraction of the fertile disk, 

 forming a broad sporangiferous area between each two of 

 the primary veins, the sporangia thus forming two rows of 

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

 cation, the seemingly amorphous sori leads him to place 

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

 aspect it resembles Dryna^ia. 



Sp. D. splendens, /. 8m. (Pedd. F. Brit. Ind. pi. 316) ; 

 D. pilosum, /. Sm. 



OBS. First discovered in the Island of Luzon, by 

 Cumings, and latterly in Singapore. D. pilosum is a much 

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

 guished by the sporangia being pilose. 



24. AGLAOMORPHA, Schott. (1835). 

 Psygmium, Presl, 1836; Polypodiwm sp., Hook. Sp. Fil. 



Swrculum 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 

 costaeform; veinlets and venules compound anastomosing, 



