GENERA OF FERNS. 433 
free and sporangiferous ; sori round, latterly confluent, con- 
stituting a continuous marginal compound sorus ; special in- 
dusium small, linear; accessory indusium universal, formed of 
the continuous reflexed margin. 
Fronds smooth, 2 to 3 feet high, pinnate; pinnee linear- 
lanceolate acuminate, 8 to 10 inches in length, serrate at the 
apex, the sori sometimes not confluent towards the apex of the 
pinne. 
Species. S. elegans, Kaulf. 
lllust. Hook. Gen. Fil. t. 58. B. f. 1, 2. 
Obs. This is an elegant fern, having the habit and aspect 
of Pteris grandifolia, with which it also agrees in the similari- 
ty of its continuous exterior or accessory indusium, which in 
this section of Dicksoniee is usually more conspicuous than 
the special indusium. 
113. Cysropium, J. Sm. 
(Dicksonie sp. Sm.) 
Veins simple or forked, direct, parallel, their apices free and 
sporangiferous ; ; accessory indusium concave, vaulted, its 
margins conniving, and including the plane interior special 
CH constituting exserted globose sori. 
Fronds dipinnate; pinne 1 foot long; pinnules linear- 
lanceolate, acuminate, truncate at the base, from 15 to 2 
inches long, dentate, ‘the teeth indusiiform, slightly reflexed. 
Special indusium much smaller than the accessory indusium. 
Species. C. sorbifolium, J. Sm. (Dicksonia sorbifolia, Sm. 
in Rees’ Cyclopedia). 
Ilust. Hook. Gen. Fil. t. 96. 
Obs. This genus is founded upon a very rare fern, a native 
of the Moluccas, and well described by Sir J. E. Smith in 
Ree's Cyclopedia; but appears not to have been taken up 
in succeeding enumerations of Filices. In general character 
it comes nearest to Deparia, but is of a different habit, and 
differs also in the peculiar cowl-like form of the fertile 
teeth or sori; and being placed at equal distances on the 
margin, the whole has a striking ge = Saccoloma 
