CHARACTERS OF TRIBES AND GENERA. 
fork of the vein; Schizocena therefore depends for its ` 
: separation from Cyathea more upon the distinct habit of 
. the species than in the character of the sori. 
= Sp. S. sinuata (Hook. and Grev.) (v v.); S. Brunonis 
(Wall.) (Bedd. F. Brit. Ind. pl. 87); S. alternans (Wall.). 
.. Oss.—The first is a simple fronded species, a native of 
Ceylon, the two latter have pinnate and bipinnate fronds, 
and are natives of Penang ànd Malacca. 
130.—CrarHEA, Sm. (1793). 
Hook. Sp. Fil. (in part). 
Vernation fasciculate, ‘erect, arborescent, squamiferous. 
Fronds bi-tripinnatifid, 5 to 15 feet long; pinnz and pin- — 
nules in some species articulated with the rachis. Veins 
forked ; venules free. Sort axillary. Receptacles columnar. 
_Indusium complete calyciform, its margin entire or Semer i 
laciniated. 
Type. Polypodiwm arborewm, Linn. 
Illust.—Hook, and Bauer Gen. Fil, t. 23; Moore Ind. 
Fil., p. 84, A; J. Sm. Ferns, Brit. and For.,fig. 191; 
Hook. Syn. Fil., t. 4. 
Oss.—In the “Species Filicum” thirty-six species are 
described, excluding Schizocena, which number is in the 
“Synopsis” increased to fifty, of which twenty-two are 
_ American, nine African, eleven Indian and Malayan, and - 
. ten Polynesian, Australian, and New Zealand. In the ` 
. Addenda of the “Synopsis” twenty-five species are enume- 
. rated, of which the greater number are new. Many of 
them present great uniformity in. the character of the 
fronds. It is probable that on better acquaintance with 
the nature of their stems, and with other peculiarities of 
habit, sufficient differences will be found to justify. thei 
