27 



28 



exserted little or very much. Ala; 

 Term; Ky. Synonym: T. speciosum 

 Willd. 



Sub-order SCHIZAEACEAE PresL 



Sporangia ovate, sessile, arranged in 

 spikes or panicles, having a complete, 

 transverse, articulated ring at apex, 

 and opening by a longitudinal slit. 

 LYG-ODIUM Swz. 



Sts scandent. Sporangia borne in a 

 double row on narrow fertile segs, each 

 on a separate veinlet and provided with 

 a special indusium. Includes 16 species. 

 PA1MATUM Swz. Climbing-fern. 



Mass; NY; Ky; Fla. Synonym: Hy- 

 droglossum palmatum Willd. 

 CaHITHOPTEEIS (Aneimia Swz.). 



Sts not scandent. Sporangia naked, 

 attached by their bases to the narrow 

 divisions of the panicled fertile segs of 

 frond. Near 30 species, chiefly tropical. 

 O: ADIAi-j 'A EFOXilA Bernh. 



Rtstock creeping; stipes 1-1 V 2 ° lg, 

 firm, naked; fronds sparingly pubescent, 

 the 2 lower branches elongate, pinnately 

 decompound, fertile; sterile portion del- 

 toid-ovate, bi-tri-pinnate; ultimate seg 

 obovate or cuneate, entire or lobed, 

 striate above with num flabellate veins. 

 Fla. Synonym: Aneimia adiantifolia 

 Swz. 



O: MEXICANA Underwood. 

 Rtstock creeping, covered with narrow 

 blackish chaff; stipes slender, scattered, 

 6-12' long; the 2 lower branches of 

 frond fertile, long-stalked, glandular, bi- 

 pinnate with densely clustered fructifi- 

 cation; the rest of the frond like the 

 sterile ones, deltoid-ovate, simply pin- 

 nate; pinnae about 6 pairs and a rather 

 Targe terminal one, short-stalked, ovate- 

 lanceolate, subcoriaceous, smooth and 

 somewhat glossy; midrib distinct, veins 

 free, oblique, parallel, closely placed, 

 nnce or twice forked. Western Texas. 

 Synonym: Anemia Mexicana Klotzsch. 

 SCHIZAEA Sm. 



Sts not scandent. Sporangia naked, 

 fixed in a double row to the midrib of 

 the narrow fertile segs. Sterile fronds 

 ^imple or dichotomously forked. In-- 

 r^Hides 16 species. 

 S: PUSILLA Pursh. 



Sterile fronds linear, very slender, 

 flattened and tortuous; fertile ones 

 equally slender, 3-4' hi, and bearing at 

 top the fertile appendage consisting of 

 about 5 pairs of crowded pinnae, form- 

 ing a distichous spike. NJ; Nova 

 Fcotia; Newfoundland. 



Sub-order POLYPODIACEAE Presl, 

 Tent Pterid 167 (1836). 



Sporangia pedicelled, surrounded 

 more or less completely by a Jointed 

 vertical, and elastic ring, bursting trans- 

 versely. Sori dorsal or marginal, borne 

 on a leafy frond, with or without in- 

 f-usia. 



Tribe ACROSTICKEAE. Sporangia 

 s-pread in a stratum over the under sur- 

 face, or rarely over both surfaces of 

 frond; indusia 0. 



ACROSTICHUM L. sp PI 1067 (1753). 



Sori covering entire surface of up- 

 per pinnae. Near 200 species. 

 A: AURETJM L, Sp PI 1069 (1753). 



Stipes 1-2° long, tufted, strong, erect, 



glossy; fronds 2-6° long, 1-2° broad, 

 upper pinnae fertile, slightly smaller 

 than the barren ones; texture coriaceous; 

 areolae small, copious, without free 

 veinlets. Southern Fla. 

 A: LOMARIOIDES Jenman, Bot Dept 

 Jam b 11, 5:154 (1898). 



Description not seen. Southern Fla. 

 Chrysodium lomariodes, Jenm, Timehri 

 4:314 (1885). 



Tribe POXYPODIEAE. Son dorsal, 

 borne at or near ends of veinlets, in- 

 dusia 0. 



POLYPODIUM L. 



Sp PI 1082 (1753). 



Characters of the tribe, as formerly 

 treated; 350 or more species. Sections 

 Phelbodium, Campyloneuron and Phy- 

 matodes are considered as distinct gen- 

 era by recent writers. 



Section EUPOLYPODIITM. Veins free; 

 fronds in one species pinnate. 

 *Sori Large. 

 P: VULGARE L. 



Stipes 2-4' long, firm, erect; fronds 

 4-10' long, 1-3' broad, cut nearly or quite 

 to rachis into entire or slightly toothed, 

 com blunt pinnae; veins once or twice? 

 forked. New England; Ore; Ala. 

 Variety OCCIDENT ALE Hooker. 



Fronds larger, pinnae sharply serrated, 

 long-pointed. 

 PlPALCATUM Kellogg. 



Stipes 5-8' long, stramineous; fronds 

 12-15' long, 4-8' broad; pinnae num, tap- 

 ering to a slender point, sharply serrate; 

 sori nearest midrib; veins with 2-4 vein- 

 lets. Cal; Wash. Synonym: P. glycyr- 

 rhiza D. C. Eaton. 

 **Sori smaller, often minute. 

 P: PLUMULA H B K. 



Stipes 1-4' long, bk, slender; frond* 

 narrowly lanceolate, 9-18' long, 1-2" 

 broad; pinnae num, narrow, entire, blunt, 

 lower gradually reduced; surfaces naked 

 except the bk wiry rachis; veinlets fork- 

 ed, obscure. Fla. Synonym: P. elasti- 

 cum Rich. 



P: PECTINATUM L. 



Stipes rigid, 2-6' long; fronds elliptical- 

 lanceolate, 1-2%° long, 2-6' broad, cut 

 to rachis into horizontal, entire or tooth- 

 ed pinnae, lower ones much reduced; 

 rachis naked or finely villose; veinlets? 

 pellucid, once or twice forked; sori in 

 long rows, of medium size. Fla. 

 Section GONIOPHLEBIUM Blume. Veins 

 forming ample regular areolae (some- 

 times almost imperceptible), each with a 

 single distinct free included veinlet, 

 bearing a sorus at its terminus. 

 *Under surface squamous. 

 P: INCANUM Swz. 



Rtstock woody, wide creeping, covered 

 with small brown scales; stipes 1-4' lg, 

 erect, densely scaly; fronds 2-6' long, 

 l-\Vz' broad, cut to rachis into entire 

 pinnae; texture coriaceous; sori small; 

 veins indistinct, united or frequently 

 free. Va; III; southward. 

 P: THYSANOLEFIS A. Br. 



Rtstock slender, firm, densely covered 

 with minute lanceolate scales; stripev> 

 3-12' long, erect, scaly; fronds ovate, 3-9' 

 long, 2-3' broad; pinnae distinct, ascend- 

 ing, blunt, dilated at base (except low- 

 est), thick, subcoriaceous, covered below 



