334 CHARACTERS OF TRIBES AND GENERA. 



venules. Sporangia unilateral, anterior. Indusium plane, 

 forming linear, sub-transverse sori. 



Type. Asplenium Finlaysonianum, Wall. 



Illust. Hook. Tc. PL, t. 938, 937. 



OBS. This genus is founded on two species, which agree 

 in habit and texture with the Falcatum group of Asplenium 

 (Tarachia, Pr.), differing only in having anastomose vena- 

 tion. Mr. Moore makes it a section of the genus Hemidic- 

 tyum, from which it differs entirely in habit and texture, 

 and in the costse being obscure and evanescent. 



Sp. A. Finlaysonianum, /. Sm. (Asplenium, Wall. 

 Bedd. F. Brit. Ind., pi. 72) ; A. Purdieanum, /. 8m. 

 (Asplenium Hook. Ic. PL, t. 937)'. 



OBS. The first is a native of India, Assam, Malay Islands, 

 and Penang, the second of New Granada and Peru. 



192. ALLANTODIA, E. Br. (in part, 1810). 

 HooJc. Sp. Fil. 



Vernation fasciculate, erect. Fronds pinnate, 2 to 3 feet 

 high, pinnae linear, membraneous, 4 to G inches long, 1 

 inch broad, with a central perfect costse. Feins simple, 

 sub-parallel, becoming forked towards the margin, and 

 anastomosing, forming elongated areoles, with free, mar- 

 ginal, clavate veinlets. Sporangia unilateral, anterior on 

 the lower part of the venule. Indusium vaulted, cylin- 

 drical, forming linear oblique sori. 



Type. Asplenium reticulatum, Wall. 



Illust. Hook, and Bauer, Gen. Fil., t. 120 A. ; Moore, 

 Ind. Fil., p. 38 B. ; Hook. Syn. Fil., t. 4, fig. 39. 



OBS. The name Allantodia was in 1810 given by Robert 

 Brown to the present species, which he associated with 

 certain species, of very different habit, which Both had 



