SYNOPSIS OF THE GENERA. 
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pOLYPODIACEJE, 
R, Brown, — Sjjore-cascs pedicellate [rarely sessile), 
oblique) elastic nearly complete ring. 
ivith a vertical [rarely 
Tribe I. POLYPODIE,;®, J. Smith . — Sori round, oblong, or linear, without a special indusium. 
Sometimes the margins of the segments of contracted fertile fronds are revolute, and simu- 
lating an indusium. 
Section I. OrtliopMehiecB, J. Smith. — Veins all distinct or free. 
1. Grammitis, Swartz . — Veins simple or forked internal, the soriferous venule sometimes very- 
short. Sori oval or oblong, oblique, lateral. 
2. Polypodium, Lmnmis . — Veins simple, forked or pinnate. So7'i circular, rarely oval or oblong, 
uniserial, solitary, or irregular ; sometimes immersed in a deep cyst, terminal or lateral. 
3. Struthiopteris, Willdenow. — Fronds (fertile) with contracted conniving indusiiform margins 
to the moniliform pinnae, the segments wholly occupied by round confluent sori ; spore-cases lateral, 
the base of the pedicels concrete, and forming an elevated thickened receptacle. Veins pinnate. 
4. Allosorus, Bernhardi. — Veins forked, terminating within the indusiiform margin. Fronds 
dissimilar ; the fertile with contracted conniving indusiiform margins. Sori round or oblong, becoming 
confluent, terminal. 
5. NoTHOCHLiENA, E. Brown. — Veins forked, pinnate, or bifurcate. Sori round, solitary or laterally 
confluent into a linear continuous or interrupted marginal band, terminal. 
6. Gymnogramma, Desvaux . — Veins forked or pinnate ; venules simple. Sori oblong or linear, 
simple or forked, oblique, often becoming confluent, medial; spore-cases superficial, often occupying 
nearly the whole length of the venules, and sometimes echinate. 
Section II. Symphoplilehieai, J. Smith. — Veins anastomosing or reticulated. 
7- Meniscium, Schreber . — Veins pinnately costeform, the opposite pairs of Venules angularly or 
arcuately anastomosing, and producing from their junction an excurrent sterile veinlet, which is free 
or united with the venules above it. Sori linear, somewhat transverse, arcuate or crescent-shaped, 
continued across the j unction of two anastomosing venules, medial, at length confluent. 
8. Goniopteris, Presl . — Veins pinnately costmform, the lower (or more) opposite pair of venules 
angularly anastomosing, and producing from their junction a free or anastomosed excurrent sterile 
veinlet. Sori round, medial, or costal, sometimes echinate. 
