Monographs Details: Polypodium
Authority: Proctor, George R. 1989. Ferns of Puerto Rico and the Virgin Islands. Mem. New York Bot. Gard. 53: 1-389.
Description:Species Description - Small to large epiphytic or epipetric fems of varied habit. Rhizomes short- to long-creeping, often slender, more or less clothed with scales (these often clathrate) or sometimes nearly naked. Fronds articulate to the rhizome, monomorphic or somewhat dimorphic, mostly stipitate, glabrous or hairy, and with or without scales. Blades simple to pinnatisect (or to 3-pinnate in species not found in Puerto Rico), sometimes pectinate; margins usually entire; veins branched, free or variously reticulate, the areoles with or without included free veinlets. Sori round or oval (rarely somewhat linear), mostly terminal on free veinlets, not marginal, usually in one or more regular rows; indusium lacking; paraphyses present or absent; sporangia with annulus of 12-18 cells; spores ellipsoid, monolete, the surface usually more or less verrucose to rugose or tuberculate, or in a few cases smooth with a minute granular deposit.
1754. Type Species. Polypodium
vulgare Linnaeus, of northem Europe.
A large cosmopolitan taxon of about 225
species, of which 26 are known to occur in Puerto
Rico. These are arranged in a series of subgenera
that in altemative systems of classification are
often treated as genera. The generic name is derived
from the Greek poly, many + podion, foot,
because the highly branching rhizome of some
species fancifully resembles many feet.
Special Literature. Maxon, W. R. 1916. Polypodium
squamatum and its allies. Contr. U.S. Natl. Herb. 17: 579-596, t. 41; Weatherby, C. A. 1939. The group of
Polypodium polypodioides. Contr. Gray Herb. 124: 22-
35; Evans, A. M . 1969. Interspecific relationships in
the Polypodium pectinatum-plumula complex. Ann.
Missouri Bot. Gard. 55: 193-293, 20 figs.; Lellinger,
D. B. 1972. A revision ofthe fem genus Niphidium.
Amer. Fem J. 62: 101-120; Tryon, R. M . & A. F.
Tryon. 1982. Fems and allied plants, pp. 688-702, 42
figs., 702-708, 13 figs., 715-722, 27 figs., 722-727, 20
figs., 727-732, 10 figs; Price, M . G. 1983. Pecluma, a
new tropical American fem genus. Amer. Fem J. 73:
109-116, 2 figs.