.. (Lowes New Ferns, t. 37); L. Yapurense, Hook. (Gard. — 
140 CHARACTERS OF TRIBES AND GENERA, 
free. Fertile pinne plain, sometimes only partially con- 
tracted, sporangiferous on the under side; margin mem- 
braneous, sub-induszeform. 
Type. Acrostichum sorbifolium, Linn. 
Illust. Hook. Gard. Ferns, t. 57; Moore Ind. Fil., p. 3, A; 
J. Sm. Ferns, Brit. and For., fig. 28. 
Oss.—In my * Arrangement of the Genera of Ferns," in 
1841, I adopted Acrostichum scandens, Linn., as the type of 
a distinct genus, which I named Stenochlena, to which I. 
also referred A. sorbifolia of Linn., and A. longifolia, Kaulf. ; 
but not long after this was done, the three species came 
under my notice in a living state, and I then found that 
4. scandens differed from the two latter in having a trans- 
verse anastomose costal vein like that of Blechnum; this 
character indicates its relationship to be with Blechnum, 
the other two species being truly acrostichoid, and allied 
to a group of fifteen species which Fée places under the 
present genus; but on account of the variableness of the — 
forms which come under this genus, it is difficult to 
determine which are species. In the “ Species Filicum ” 
no less than'eighteen specific names and five genera are 
given as synonyms under L. sorbifolia; but it is quite 
probable that when seen under cultivation some of these 
forms may be found to be quite distinct species, of which 
L. sorbifolia and L., longifolia are proofs. They are 
widely dispersed over the Tropics of the Western and ` 
Eastern Hemisphere, and also represented in New 
Zealand, ‘ 
Sp. L. sorbifolia (Linz.) (v v.); L.longifolia (Kaul£)(v v.), - 
Ferns, t 57); L. Smithii, Fée Acrost. p. 74, t. 33, fig. 2, 
` (Stenochlena longifolia, J. Sm.) ; L. Boryana, Fée Acrost., | 
t. 27; L. leptocarpa, Fée (Aerost., t. 29); L. cuspidata, Fée 
