CHARACTERS OF TRIBES AND GENERA. 313 
transverse vein, continuous with, and close to the mid-rib ; 
venules simple or forked, direct, their apices clavate, united 
forming a pellucid cartilaginous spinulose margin ; fertile 
segments linear, rachiform, margin membraneous, involute, 
indusweform. Sporangia occupying the whole disc of the 
narrow segment, 
Type. Acrostichum scandens, Linn. 
Illust. Hook. and Bauer, Gen. Fil, t. 105 B.; Moore 
Ind. Fil, p. 3 B. ; J. Sm. Ferns Brit. and For., fig. 
108; Hook. Syn. Fil. t. 7, fig. 60, f. g. 
Oss.—In my original definition of this genus in 1841, 
the venation is said to be free, which is strictly the case 
with several species which I then placed under it (now 
species of Lomariopsis). Since then I have had the oppor- 
tunity of examining living plants of S. scandens, in which 
I find the pinns of the sterile frond have a transverse 
. &nastomose vein continuous with and close to the mid-rib, 
but which on account of the narrowness of the fertile 
Pinne is not evident, the sporangia occupying the whole 
Segment as in Lomaria, which with its narrow involute 
indusoid margin indicates its affinity to be with the present 
tribe Blechnee, rather than with Acrosticheæ. 
Sp. S. scandens (Linn.) (v v.) (Lomaria scandens, Willd.) ; 
S. Meyeriana, J. Sm. (v v.) (Lomaria, Kze. ; Acrostichum, 
Meyeriana, Hook. Gard. Ferns, t. 16). 
Oss.—The latter is a native of Natal, ihe first is very 
. Benerally spread throughout India, the Malayan Archi- 
 Pelago, the Philippines, and the Islands of the Eastern 
Pacific, assuming different appearances according to the 
Various local influences of climate, which has led to its 
being described by authors under many different names. 
The sterile pinn, are occasionally variously lobed or 
Sinuose, two of such forms having been named by Wallich 
