150 CHARACTERS OF TRIBES AND GENERA. 
64.—Hemionits, Linn., in part. 
Hemionitis, Acrostichum, and Gymnogramma, sp. Hook. 
Sp. Fil. 
Vernation erect or sub-decumbent, acaulose. Fronds 
simple, cordate, palmate or pinnate, smooth, villose or 
squamose, 6 to 12 inches in height. Veins uniform, reti- 
culate ; in some the venules free next the margin. Sporangia 
occupying the whole of the venation, forming reticulate, 
often confluent, superficial sori. 
Type. Hemionitis palmata, Linn. ' 
Ilust. Hook. and Bauer, Gen. Fil., t. 74 B.; Hook. Ex. 
Fil., t. 93; Moore Ind. Fil, p. 45, B; J. Sm. Ferns, 
Brit. and For., fig. 54; Hook. Syn. Fil. t. 6, fig. 59, A. 
Oss.— The type of this genus is the well-known Hemionitis 
palmata of Linnsus, to which several other species have 
been added. Four of these possess the same general habit 
as the type; but this cannot be said of H. cordata, H. vestita, 
and H. Muelleri, which, although I retain them as sections 
of Hemionitis, are nevertheless almost worthy of being 
regarded as types of distinct genera. 
* Hemionitis vera. 
Fronds palmate or lobed, pinnatifid or sub-pinnate, villose. 
H. hedersfolia, J. Sm. (Hook. Syn. Fil.); H. palmata 
(Linn.) (v v.); H. podophylla (Hook.) (v v.) (H. pedata, 
J. Sm. non Sw.) ; H.pinnatifida, Baker; H. pinnata, J. Sm. 
(Hook. Syn. Fil.) | 
. Natives of the West Indies and parts of Tropical 
America. 
** Sericonitis. 
Caudex decumbent, sub-sarmentose, short. Fronds con- ` 
tiguous, pinnate, 6 to 14 inches long; pinmm contiguous, l to — 
