SYNOPSIS OF THE GENEKA. 
13 
9. Goniophlebium, Presl . — Veins forked or piniiately costa;form, the lower exterior venule free 
and fertile, the rest angularly anastomosing, and producing from their junction an excurrent free, 
often fertile, veinlet. Sori round, in one or more transverse parallel rows, naked or squamiferous, 
terminal. 
10. Cy'RTOPhlebium, M. Brown . — Veins forked or pinnatcly eostmform, the lowest Gxicrior venule 
free and fertile, the rest arcuately or angularly anastomosing, producing from their exterior side two 
or more excurrent free, usually fertile vemlets, which are sometimes very short, or sometimes united 
with the next superior venules, thus forming two series of arcoles between each two primary veins. 
Sori round, naked, arranged in two rows between and parallel with the costsefoi'm veins, or irregular, 
terminal, or lateral. 
11. Niphobolus, Kaulfiiss. — -Veins internal, indistinct, pinnate; venules parallel, transversely 
anastomosing, producing from their exterior side two to five or more free or irregularly anastomosing 
vemlets. Sori round, terminal, in parallel transverse rows between the veins, sometimes irregular 
and usually confluent, protruding through dense stellate pubescence. 
12. Phlebodium, It. Brown .. — Veins pinnate or variously branched ; venules arcuately or angularly 
anastomosing, producing on their exterior side or at their angular junction two or more conniving 
veinlets, which are sporangiferous on their combined apices or point of junction. Sori round, oval or 
rarely oblong-linear, transversely uniserial, biserial or multiserial, sometimes irregular. 
13. Deynaria, Bory . — Veins pinnate, parallel or flexuose; venules compoundly anastomosing, 
producing sori at the angles or points of confluence, and from their sides variously directed free 
sterile veinlets. Sori round or oblong, naked, or squamiferous, superficial or deeply immersed, uni- 
serial, or in one or two oblique rows between the veins, or irregular. 
14. Dictymia, J. Smith.— Venation uniform, reticulated, internal, the transversely uniserial sori 
compital, or produced at the confluence of the venules ; receptacle immersed. Sori large, oblong. 
15. Drymoglossum, Presl. — Venation uniform, compoundly anastomosing, pi-oducing variously 
directed free veinlets. Sori linear, continuous, marginal or intramarginal, produced on the transverse 
sides and junctions of the venules, forming a broad pilose or squamiferous marginal soriferous line. 
16. TiENioPSis, J. Smith. — Veins simple, parallel, the apices combined transversely by the recep- 
tacle. Sori linear, continuous, immersed in an intramarginal groove. 
17. ViTTARiA, Smith . — Veins simple, parallel, the apices combined transversely by the marginal 
receptacle. Sori linear, continuous, immersed in a marginal groove facing outwards. 
18. Antrophyum, Kaulfuss . — Venation uniform, reticulated, the sides of the areoles more or less 
sporangiferous. Sori linear, continuous or interrupted, reticulated, the receptacle immersed in the 
substance of the frond. 
19. Hemionitis, Linneeus. — Venation miiiorra, reticulated, the sides of the nearly equal areoles 
sporangiferous. Sori linear, reticulated, superficial, subsequently confluent. 
20. Ceratopteris, Brongniart. — Fronds dissimilar, flaccid. Veins transversely elongated, and 
distantly anastomosing. Soil linear, continuous, parallel, superficial, occupying the lengthened 
transverse sides of the venules, and concealed by the reflexed conniving margins of the segments. 
Tribe II. ACROSTICHEjE, J. Smith . — Sori amorphous, that is, not of any definite form, without 
a special indusium. 
Section I. OrthophJeMete , J. Smith.— Veins all distinct or free. 
21. Elaphoglossxjm, Schott . — Veins internal, simple, or forked; venules parallel, their apices 
clavate, terminating in a thickened margin. Sori dense, usually covering the whole under surface 
of the fertile fronds, which are smaller than the sterile ones. 
22. SlENOCHLiENA, J. Smith. — Fronds (fertile) contracted. Veins (sterile) simple or forked ; 
venules parallel, their apices exserted forming cartilaginous serratures, or conniving and forming a 
thickened margin. Sori densely covering the under side of the linear narrow pinute, which have 
membranous revolute margins. 
