CHARACTERS OF TRIBES AND GENERA. 947 
sori with Alsophila, I refer them to the Hymenostegia section 
of that genus, restricting Hemitelia to about a dozen species, 
which are readily distinguished from Ælsophila by the lower 
venules anastomosing opposite the sinus of the lacins, 
but in some species this character is wanting, the whole of 
the venules being free; their habit of growth and broad 
divisions of the fronds is indicative of their relationship to 
be with Hemitelia rather than with Alsophila ; it, however, 
must be admitted that although the typical species of 
Cyathea, Hemitelia, and Alsophila, warrant their separation 
as distinct genera, the transition species however appears 
to unite them so as to form one natural group. The 
species as here restricted to Hemitelia, are all natives of the 
West Indies and Tropical America. 
* Fronds pinnate; pinne entire. 
Sp. H. speciosa (Kaulf.) (v v.); H. Lindeni ( Hook.) ; 
H. grandifolia (Spreng.) (v v.); H. obtusa (Kaulf.) (v v-) 
** Fronds bipinnatifid. 
H. Imyrana (Hook.) (v v.); H. Karsteniana (Hook.) 
(v v.) ; H. horrida (R. Br.) (v v.) ; H. marginalis (J. Sm.). 
132.—Arsormma, R. Br. (1810). 
Hook. Sp. Fil. ; Amphicosmia Gard. 
. pinnatifid, 5 to 15 feet long. Veins simple or forked, free. 
Bori axillary or medial, Receptacles elevated, globose, or 4 
columnar. Jndusium semi-calciform, or small and squame- 
form, often wanting, in some trichiferous. 
Type. | Cyathea multiflora, Sm. 
Vernation fasciculate, erect, arborescent. Fronds bi-tri- we 
