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CHARACTERS OF TRIBES AND GENERA. 
glossum, but are distinguished by the veins being connected 
at the margin by a continuous zigzag or straight vein, 
similar to that of the genus Olfersia, but which has pinnate 
fronds, and also differs in the nature of its vernation. 
Sp. A. nervosa (Bory) (v v.) (A. subdiaphanum, Hook. 
and Grev.); A. longifolia (Jacq.) (v v.); A. gorgoneum 
(Kaulf.) . 
42.—Hymenopium, Fée (1844). 
Dictyoglossum, J. Sm., 1846 ; Acrostichum sp., Hook. Sp. Fil. 
Vernation fasciculate, decumbent, thick. Fronds con- 
tiguous, stipitate, simple, entire, from 1 to 2 feet in length, 
broad elliptical, smooth or squamiferous, subcoriaceous. 
Veins uniform, reticulated, forming elongated oblique 
areoles. Fertile fronds the same shape as the sterile ones, ` ` 
but smaller. | 
Type. Acrostichum crinitum, Linn. 
Illusí. Hook. and Grev., t. 1; Hook. Fil. Exot., t. 6; 
Moore Ind. Fil., p. 6 A. ; J. Sm., Ferns Brit. and For., - 
fig. 31. | 
Oss,.—The reticulated venation distinguishes this genus 
from the two preceding ; it consists of three known species, 
two being natives of the West Indies and one of the 
Sandwich Islands. 
Sp. H. crinitum (Linn.) (v v.) ; H. reticulatum (Kaulf.) 
(v v.) ; H. pachyphyllum (Kze.). 
43.—AxzTIUM, Splitg. (1840). 
Hemionitis, Hook. Sp. Fil, Antrophyum Fée. 
.. Vernation uniserial, sarmentum slender. Fronds distant 
simple, oblong elliptical, acuminate, 6 to 20 inches long, 
