POLYPODIACEAE 9 



petioles usually short; blades linear or linear-lanceolate, attenuate, 2-4.5 dm. long, 

 0.5-2 cm. broad, leathery, glossy, paler below, the margins entire or undulate-repand. 

 venation obscure. 



On trees, peninsular Florida. General in tropical America. 



2. Campyloneumm costatum (Kunze) Presl. Eootstock stoutish, short- 

 creeping, scaly at the end. Leaves usually few, stiffly erect; petioles 4-15 cm. long, 

 smooth, slightly dilated at the top; blades linear-oblong to oblong-lanceolate, 2-3 

 dm. long, 3.5-5 cm. broad, coriaceous, subentire, repand; sori minute. 



On logs and tree-trunks, southern peninsular Florida. Also in the West Indies. 



3. Campyloneuron Phyllitidia (L.) Presl. Eootstocks stout, scaly. Leaves 

 erect; petioles short or wanting; blades simple, 3-9 dm. long, 2.5-10 cm. broad, 

 leathery, acute, gradually narrowed below: areolae in rows of 6-12. 



Southern peninsular Florida. Also in tropical America. 



4. Campyloneurum latum Moore. Eootstocks very stout, short-creeping or 

 ascending, with large deep cup-shaped scars. Leaves few, clustered; blades long- 

 stalked, oblong-lanceolate, 4-10 dm. long,, 5-10 cm. broad, leathery, glossy, the 

 margins strongly repand; veins elevated, relatively close; areolae irregular. 



On rocks and trees, in hammocks, southern peninsular Florida. Also in tropical America. 



5. PHYMATODES Presl. 



Tropical plants, often epiphytic, with simple leaf -blades. Sori rounded, naked, 

 dorsal, various in position. Veins forming fine copious irregular areolae with free 

 veinlets spreading in various directions. 



1. Phymatodes exiguum (Hew.) Underw. Eootstocks widely creeping, slen- 

 der,, covered with linear ferruginous scales. Leaves elongated; petioles 6-12 mm. 

 long, slender, naked; blades simple, 5-10 cm. long, entire, undulate or barely lobed, 

 attenuate: sori in one series on free veinlets. [Polypodium Swartzii Baker.] 



Climbing on shrubs, southern peninsular Florida and Key Largo. Also in West Indies. 



6. VITTARIA J. E. Smith. 



Tufted often epiphytic plants, with grass-like leaves. Sori linear, continuous in 

 a single marginal or intramarginal groove upon each side. Indusia wanting. Veins 

 forming a single row of areolae on each side of the midvein, obscure. 



1. Vittaria lineata (L.) J. E. Smith. Leaves 1.5-9 dm. long, 2-5 mm. 

 wide, narrowed gradually toward a stout compressed stem, the edges sometimes 

 reflexed. 



On palmettos, middle and peninsular Florida. Also in tropical America. GRASS FERN. 



7. PALTONIUM Presl. 



Epiphytes, relatively small, with simple leaf -blades. Sori linear, continuous or 

 sometimes interrupted, nearly marginal. Veins reticulated, the areoles with free 

 included veinlets. 



1. Paltonium lanceolatum (L.) Presl. Eootstocks creeping. Leaves numer- 

 ous; petioles 2.5-5 cm. long; blades simple, 15-38 cm. long, 1.5-3 cm. wide, rigidly 

 coriaceous, entire, often somewhat crisped, tapering both ways, with prominent mid- 

 rib and immersed veins, fertile in the apical part. [Taenitis lanceolata (L.) E. Br.] 



On trees, Old Rhodes Key, Florida. Also in tropical America. 



8. PTERIS L. 



Eelatively large plants, with petioles continuous with the rootstock and variously 

 divided leaf -blades. Sori marginal, linear, continuous, occupying a slender or filiform 

 receptacle, connecting the tips of the free veins. Indusium membranous, single, 

 formed from the reflexed margin of the leaf -blade. Veins free in our species. 



Lower divisions of the leaf-blades undivided. 1. P. longifolia. 

 Lower divisions of the leaf-blades forked or pinnate. 



Leaflets 7-10 mm. wide, the upper scarcely decurrent. 2. P. Cretica. 



Leaflets 5 mm. wide or less, the upper strongly decurrent. 3. P. multifida. 



