16 
SYNOPSIS OF THE GENERA. 
48. Neottopteris, J. Smith. — Veins forked ; venules direct, parallel, combined at the apices by a 
transverse continuous marginal vein. Sori linear parallel, unilateral on the anterior side of the 
venules ; indusium plane. 
49. Antigeamma, Presl. — Veins forked ; venules angularly anastomosing or reticulated, with 
the marginal veinlets free. Sori linear, unilateral on the proximate sides of the primary 
venules of each fascicle, usually confluent in pairs ; indusium linear, the free margins of each pair 
conniving. 
50. HiEMiDiCTYUM, Presl. — Veins forked ; venules parallel near the costa, anastomosing and 
reticulate near the margin, where they are combined by a transverse continuous vein. Sori linear, 
unilateral, on the anterior side of the parallel portion of the venules ; indusium plane. 
51. Callipteris, Bory . — Veins pinnately costceform, the opposite pairs of venules angularly 
anastomosing, the superior ones usually free. Sori linear, binate, produced on both sides the venules ; 
indusium plane. 
Tribe V. ASPIDIEA3, J. Smith. — Sori round, rarely oblong, intramarginal, furnished with a special 
indusium, wliich is orbicular produced from the centre of the sporangiferous receptacle, or 
reniform or cucullate produced from its posterior side, or attached wholly round the receptacle 
(calyciform). 
Section I. Symplophlehiece, J. Smitli. — Veins anastomosing or reticulate. 
52. Hypoderris, It. Bi'own.— Veins cosi^iovm-, venules compoundly anastomosing, producing 
from their sides variously directed free sterile veinlets, and soriferous at the j)oints of confluence of 
several veinlets. Sori small, irregular or uniserial on each side the veins ; indusium small calyciform, 
very membranous, laciniate and fimbriate at the margin. 
53. Aspidium, Swartz. — Veins costceform ; venules compoundly anastomosing, producing from 
their sides variously directed free sterile veinlets, and soriferous on the points of confluence of several 
veinlets. Sori round, reniform, or by confluence oblong, irregular, or uniserial on each side the veins ; 
indusium orbicular, peltate, or reniform, and attached laterally. 
54. Sagenia, Presl. — Veins pinnate ; vemdes arcuately or angularly anastomosing (compoundly 
anastomosing in the sterile fronds), forming unequal areoles with variously directed free veinlets on 
the apices of which the sori are most frequently borne. Sori reniform or orbicular, uniserial on each 
side the primary veins, or irregular, usually on the apices of free veinlets, sometimes on the points of 
confluence of two or more veinlets ; indusium reniform or orbicular. 
55. Onoclea, Linnceus. — Fronds dissimilar, the fertile with contracted bacciform sessile segments, 
with membranous conniving fimbriate margins forming an universal indusium. Veins (fertile 
fronds) simple direct free; or (sterile fronds) reticulated. Sori round, confluent, 4 — 8 on each 
segment, medial, the pedicels of the spore-cases concrete ; indusium (special) lateral, cucullate, very 
membranous. 
56. Cyrtomium, Presl. — Veins pinnate ; venules, except the lower exterior one, which is free and 
fertile, angularly anastomosing, and producing from their exterior side or angular junction, 1 — 3 
excurrent free fertile veinlets. Sori round, medial, numerous, transversely multiserial ; indusium 
orbicular, peltate. 
57. Fadyenia, Hooker. — Fronds dissimilar, the fertile contracted, the sterile proliferous at its 
apex. Veins forked; venules anastomosing and reticulate, the lower anterior one in each fascicle free 
and fertile at its apex. Sori large, roundish- or oblong-reniform, transversely uniserial in the costal 
areoles ; indusium reniform, lateral. 
58. Nephrodium, Schott. — Veins pinnately-costeform ; vemdes angularly anastomosing, the lower 
or more pairs producing from their junction an excurrent anastomosing veinlet, the superior ones free. 
Sori round, medial, uniserial on each side the primary veins, sometimes confluent ; spore-cases some- 
times echinate ; indusium reniform, rarely orbicular. 
