8 POLYPODIACEAE 



at the apex; leaflets numerous, crowded, the upper side facing the rachis. [A. 

 lomarioides Jenm.] 



Southern peninsular Florida. General in tropical America. 



2. POLYPODIUM L. 



Plants with creeping or horizontal rootstocks. Leaves various: petioles jointed 

 to the rootstocks: blades pinnate or simple, the veins free or only casually anastomos- 

 ing. Sori orbicular in our species, dorsal, in one or more rows on either side of the 

 midrib. Indusium none. 



Both surfaces of leaf-blades naked. 



Sori large (2 mm. broad): lower segments of the leaf-blade not reduced. 1. P. vulgare. 

 Sori smaller (1 mm. wide or less): lower segments of the leaf-blades reduced. 



Leaf-blades with segments 3 mm. wide or less: veins once forked. 2. P. Plunuila. 



Leaf-blades with segments 5 mm. wide or more: veins 2-3-forked. 3. P. pectinatum. 



Under surface of leaf-blades with scattered peltate scales. 4. P. polypodioides. 



1. Polypodium vulgare L. Kootstocks widely creeping, densely covered with 



cinnamon-colored scales. Leaves evergreen; petioles light-colored, glabrous, 5-15 



cm. long; blades ovate-oblong or narrowly oblong, slightly leathery, glabrous, 7-25 



cm. long, cut nearly to the rachis into linear or linear-oblong segments: sori medial. 



On rocks or rocky banks, or rarely on trees, almost throughout eastern North America. 

 Also in Asia and Europe. Polypody. 



2. Polypodium Plumula H.B.K. Leaves erect or spreading; petioles 2.5-10 

 cm. long, black, slender; blades narrowly lanceolate, 20-40 cm. long; segments 

 numerous, narrow, entire, blunt, the lower abruptly smaller, the surfaces naked except 

 the black wiry rachis: veins obscure. 



Peninsular Florida. Also in tropical America. 



3. Polyportium pectinatum L. Leaves spreading or arching; petioles rigid, 

 5-15 cm. long; blades elliptic-lanceolate, 3-8 dm. long, cut to the rachis into 

 horizontal entire or slightly toothed segments, the lower ones gradually reduced to 

 triangular lobes: rachis naked or finely villous; veins pellucid. 



Eastern peninsular Florida. Also in tropical America. 



4. Polypodium polypodioides (L.) A. S. Hitchcock. Eootstocks widely 

 creeping. Leaves evergreen; petioles densely scaly, 2.5-4.5 cm. long; blades oblong 

 or oblong-lanceolate, 3-15 cm. long, acute, cut nearly or quite to the rachis into entire 

 oblong or linear obtuse segments, nearly glabrous above, the lower surface and rachis 

 covered with gray peltate scales with darker centers: veins obscure. [P. incanum Sw.] 



On trees or rocks, Pennsylvania to Illinois, Missouri, Florida and Texas. Also in 

 tropical America. 



3. PHLEBODIUM R. Br. 



Tropical mostly epiphytic plants, with pinnate leaf-blades. Sori rotmd, naked, 

 dorsal, borne on the tmited ends of two or more free veinlets which are included in 

 the ample areolae formed by the regular anastomosing veins. 



1. Phlebodium aureum (L.) E. Br. Eootstock short, densely scaly. Leaves 

 ample, 3-6 dm. long; petioles chestnut-colored, naked; blades 6-15 dm. long, cut 

 nearly to the rachis into broad entire or undulate segments. [Polypodium aureum L.] 



On trees and logs, peninsular Florida and the Keys. Also in tropical America. 



4. CAMPYLONEURUM Presl. 



Mainly tropical plants with usually simple entire leaf-blades. Primary veins 

 distinct, extending from the midrib to the margin, connected by curved parallel 

 transverse veinlets, these forming more or less regular areoles, each with 1 or 2 sori 

 upon the free exeurrent included veinlets. 



Leaf-blades narrow, 2 cm. wide, or less. 1. C. angustifolium. 

 Leaf-blades broader, 3-8 cm. wide or more. 



Veins obscure; blades opaque, abruptly acuminate-cuspidate. 2. C. coslalum. 

 Veins evident; blades lustrous, obtuse to acuminate. 



Stipes short or wanting. 3. C. PhylUtidis. 



Stipes much longer. 4. C. latum. 



1. Campyloneurum angustifolium (Sw.) Fee. Eootstocks creeping, with cup- 

 shaped leaf -scars, clothed with slender brown scales. Leaves numerous, clustered; 



