. CHARACTERS OF TRIBES AND GENERA, 
128.—PsrnaAxEMA, Don. (1825). 
Spheropteris, Wall., Hook. Sp. Fil. 
` A to 6 feet high, stipate, deltoid, decompound, ultimate 
 pinnules and lacinæ sessile, linear oblong, obtuse, half an 
inch long, pinnatifid, repand, or crenate. Veins forked 
clavate, free. Sporangiferous receptacies medial pedicellate, 
‘included within a calyciform indusium, forming globose 
elevated sori. 
Type. Peranema cyatheoides, Don. 
Tilust. Hook. and Bauer Gen. Fil, t. 22; Schott. Gen. 
Fil., t. 4; Moore Ind. Fil., p. 80, B. ; Hook. Syn. Fil., 
t. 1, fig. 5. : 
Oss.—This genus also consists of a single species, a 
native of Nepal and Sikkim, 1n general aspect it resem- 
bles some of the large decompound species of Lastrea, such 
as L. villosa. It is specially remarkable in the sori being. 
elevated above the surface of the frond, similar to the 
genus Eupodium in the tribe Maratiiacec, although the ` 
. Similar to that of Cyathea; nevertheless, their dwarf, ` 
. Stemless habit, prevents their natural association with Ee 
tree Ferns. = 
Vernation fasciculate, decumbent, squamose. Fronds ` 
calyciform indusium of this and the preceding genera is 
_ Sp. P. cyatheoidos, Don, Bedd, F, 8 Tnd., pl. TB(Spher. — 
_opteris barbata, Wall.) 
_ hoary scales, which in its native places of growth imparts ` 
ea to it an aged appearance, : = 
Tribe 15.—CYATHEA (Plate 15). re 
| Vernation terminal, fasciculate, forming tree-like stems, - 
50 or more feet high, Sori medial, round, rarely oblong. 
Oss.—The stipes of this Fern are densely covered with ` ` 
