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140 F E R N S O F NORTH AM ER IC A .
veins, the veins in the other being always simple. Specimens
marked P. taxifolium, and distributed from the Kew herbarium
(No. 924) have, however, forked veins, and belong rather
to P . Pl-umula. The only plant I have of genuine P. taxi-
folimn is Fée’s P . I'Herminieri, from Guadeloupe.
Whether the Mexican P. ptdchrum is distinct from P.
Plmmtla or not, must be left to others to decide: in the few
specimens I have seen, no specific difference is discernible.
With this species the account of our North American
Polypodia is completed. There are nine species in all: four
of them, P. pecHnalum, Plumula, aureum and Phyllitidis, are
tropical species which enter our limits only in Florida; one,
P. incanum, is a tropical species which comes as far north
as West Virginia and Indiana; one, P. vulgare, is a plant of
the north-temperate zone generally, and three species, P.
Scouleri, P. Californicum and P. falcatum, the last doubtfully
distinct, are found only on our Pacific Coast.
Plate LX III., Fig. 5-8. — Polypodium Plumula, from Indian River,
Florida. Fig. 6 is an enlarged drawing of a pinna, showing the simply
forked veins. Fig. 7 is a minute scale from the midrib, magnified,
Fig. 8 is a spore.
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