804 CHARACTERS OF TRIBES AND GENERA. 
Sp. C. meniscioides, Presl. (Willd.); C. confertum, Presl. 
(Kaulf.) (v v.); C. abbreviatum, Presl. (Schrad.). 
106.—Crrtomium, Presl (1836). 
Aspidium sp., Hook Sp. Fil. 
Vernation fasciculate, erect. Fronds 1 to 8 feet high, 
pinnate, pinnz elliptical lanceolate, 6 to 8 inches long, 
1 to 4 inches wide, falcate, more or less auriculated at the 
base, the margin sub-entire or spinulose, veins two or 
three times forked or pinnate, venules alternate, the lower 
exterior branch free, the others acutely anastomosing,- 
producing from their junctions free or anastomosing vein- 
lets. Receptacles punctiform on or below the apices or 
points of junction of the venules. Sori round, transversely 
uniserial, or numerous and oblique serial. Indusium 
orbicular. 
Type. Aspidium falcatum, Swartz. 
Illust. Hook. and Grev., t. 171; Hook. and Bauer, t. 49, 
C; Hook. Fil. Exot., t. 92; Moore Ind. Fil., p. 66; 
J. ur Ferns, Brit. and For., fig. 68; Hook. Syn. Fil., 
t. 5, fig. 43, c. 
. Oss.—The few species constituting this genus agree in 
general habit with the pinnate species of Polystichum, but 
differ in having anastomose veins. I can find no character 
of sufficient value to retain Presl's genera Phanerophlebia 
and Amblia as distinct from Cyrtomium, these two genera 
RD being evidently founded on specimens off which the indu- 
‘sium had fallen; the only point that may give them an 
appearance of genuine difference is, that the typical species 
of Cyrtomium are Eastern, and those of the latter genera 
Western. 
wet C. caducum ( Wall.) Hemigonmm, J. Sm., 1841); C 
D 
