_ CHARACTERS OF TRIBES AND GENERA, 277 
154.—Hewarpia, J. Sm, (1840). 
Adiantum, sp., Hook. Sp. Fil. * 
Vernation sarmentose (?) Fronds 1 to 2 feet high, pin- 
nate, or dichotomously bipinnate, smooth, pinne and 
pinnules alternate, distant, petiolate (not articulate), some- 
times falcate, 4 to 8 inches long, 1 to 2 inches wide. 
Coste evident, central. Veins uniform, reticulated, forming 
elongated, oblique areoles. Indusiwm marginal, continuous, 
venose, and sporangiferous on its under side, as in Adian- 
tum, at length becoming replicate and involute, forming a 
continuons sorus, occupying both margins. 
Type. Hewardia adiantoides, J. Sm. 
Illust. Hook. and Bauer, Gen. Fil., t. 89; Moore, Ind. 
Fil., p. 25 A. 
Oss. This genus is distinguished from Adiantum by 
having reticulate venation, on both sides of the central coste. 
Sp. H. adiantoides, J. Sm., Hook. Journ. Bot., vol. 3, 
t. 16 and 17; H. dolosa, Fée, Hook. Sp. Fil., 1, t. 79 B. m 
Natives of Guiana and Brazil. Although the latter 
Species agrees in general habit with H. adiantoides, the 
veins, however, are not so decidedly anastomose, and on 
account of H. Wüsoni and A. Leprieurii having occasional 
anastomose venation, they are therefore by some also re- 
ferred to this genus. 
Tribe 90.—CHEILANTHELE. (Plate 20.) 
Fronds varying from simple pinnate to decompound 
multifid, and from a few inches to 2 feet in height, smooth, 
or densely tomentose or squamose. Venules free. Sporan- 
gia terminal, marginal; sori punctiform, distinct, or two 
or more laterally confluent, seated in the axis of the in- 
flexed membraneous margin of the segment (indusium). 
