42 



ovate-1, simply pinnate or bipinnate be- 

 low; pinnules and. upper pinnae 1-2' long-, 

 li' broad or less, nearly sessile, smooth; 

 indusium formed of slightly altered in- 

 curved edge of pinnules. Vt; Tex; Ar. 

 Synonyms: AllOsorus atropurpureus 

 Kunze. — Pteris atropurpurea L. — Platy- 

 loma atropurpurea J. Smith.. 

 F„ ASPEEA Baker. 



Stipes slender, 2-3' long, bk with 

 scurfy pubescence; fronds 4-6' long, ob- 

 long-lanceolate, bipinnate: pinnae and 

 pinnules deltoid-lanceolate or dblg, 

 pinnules next to main rachis often 

 lobed; all of them rough on. both sur- 

 faces with short harsh hairs. Tex; NM. 

 Synonym: Cheilanthes aspera Hooker. 



II. — Fronds 2-4-pinnate, ultimate segs 

 oval or cordate. 



PELLABA ANDROMEDAEFOLIA Fee. 



Stipes scattered, erect, pale brown, 2- 

 12' long; fronds 6-12' long, 3-6' broad, 

 ovate, 2-4-pinnate, 3-p; com pinnae rath- 

 er distant, spreading; ultimate pinnules 

 2-5" long, oval slightly cordate cori- 

 aceous, margin of fertile ones some- 

 times revolute to midrib; veins num, 

 parallel. Synonyms: Allosorus androm- 

 aefolius Kaulf. — Pteris andromedaef ol- 

 ia Kaulf, Enum Fil 188 (1824). 



Arizona; southern and Baja California. 

 F. PULCHELLA Fee, Gen Fil 129 (1850- 

 2). 



Stipes densely tufted, 3-6' long, chaffy 

 at base, nearly bk; fronds 3-9' long, 1-5' 

 broad, triangular-ovate, 4-pinnate be- 

 low, gradually simpler above; lower pin- 

 nae deltoid, narrowly triangular above; 

 "ultimate pinnules num, 1-3" long, oval or 

 often cordate-ovate, stalked, coriaceous, 

 smooth, edges often much reflexed. Tex; 

 NM. Synonym: Allosorus pulchellus 

 Mart. & Gal, mem ac Brux, 15 (5):47 

 (1842). 



III. — Fronds 3-4-pinntifid ; segs lin- 

 ear-oblg: secondary rachises margined. 

 F. MARGIN AT A. Baker. 



Stipes tufted, 3-9' long, castaneous, 

 shining, slightly fibrillose at base; 

 fronds 4-6' long, nearly as broad, de- 

 ltoid; lower pinnae much the largest; 

 indusium broad, continuous. margins 

 slightly erose; texture chartaceous. 

 Huachuca mts. Ar (Lemmon). Synonym: 

 Cheilanthes marginata Hooker. 



**Pinnules mucronulate or decidedly 

 acute. 



I. — Fronds narrowly linear in outline, 

 com bipinnate. 

 F. T13RNIPOX,IA Link. 



Stipes tufted, nearly or quite bk, 2-6' 

 long, fronds 4-10' long, narrowly linear; 

 pinnae com 9-15 pairs, all but uppermost 

 trifoliate; segs com linear, slightly mu- 

 cronate, coriaceous, sessile or middle one 

 indistinctly stalked, edges much inflexed 

 in fertile fronds; indusium broad. Tex. 

 Synonym: Pteris ternifolia Cav. 

 F. BBACHYPTEM Baker. 



Stipes 2-8' long stout, p'ish-brown; 

 fronds 3-8' long, narrow in outline from 

 the ascending secondary rachises, bipin- 

 nate: pinnules crowded, 2-5" long, ob- 

 long-linear, simple or trifoliate, acute or 

 mucronulate; margins inflexed to midrib 

 in fertile fronds. Cal. Synonmys: P. 

 ornithopus brachyptera D. C. Eaton. — 



Platyloma bellum et P. brachypterum 

 Moore. 



II. — Fronds broader, lanceolate to 

 ovate, 2-3-pinnate. 

 PELLAEA ORNITHOPUS Hook. 



Stipes tufted, 3-8' long, rather stout, 

 dark brown: fronds very rigid, 3-12' long, 



2- 3' broad, broadly deltoid-lanceolate, 2- 



3- pinnate; primary pinnae spreading or 

 obliquely ascending, linear bearing 4-16 

 pairs of trifoliate (varying from simple 

 to 5-7-foliate) mucronulate pinnules, 

 iy 2 -2" long; margins inflexed to midrib 

 in fertile fronds. Synonym: Allosorus 

 mucronatus D. C. Eaton. 



California; Baja Cal. Tea or wire fern 

 PELLAEA WRIGHT! AN A Hook. 



Rtstock short, thick, densely chaffy; 

 stipes crowded, p ish-brown, 4-6' long; 

 fronds 3-6' long, 1-3' broad, lanceolate 

 to deltoid, trifoliate at apex, bipinnate 

 below; pinnae short with 1-2 pairs of 

 long, narrow pinnules besides the ter- 

 minal one; mucro short, with broad car- 

 tilaginous margin; margin of fertile 

 fronds inflexed to midrib. Extremely 

 variable. Colo; Tex; Cal; Kans. 

 Variety LQNGIMTJCRONATA Davenport. 



Fronds decreasing to simply pinnate 

 at apex, longer but less broadly winged 

 mucro. Synonym: P. longimucronata 

 Hooker. 



Variety COMPACTA Davenport. 



Pinnules densely crowded. 



Section PLATYLOMA J. Smith. Tex- 

 ture coriaceous, veins com hidden, ulti- 

 mate segs broad and flat, indusium so 

 narrow as to be soon hidden by fr. 

 F. BK.IDGESIZ Hooker. 



Stipes 2-6' long, tufted, castaneous; 

 fronds 4-6' lg, 1' or more broad, simply 

 pinnate; pinnae 5-18 pairs, mainly opp, 

 nearly sessile, glaucous g, coriaceous, 

 rounded or corbate at base; indusium 

 narrow, formed of w'ish margin of pinna, 

 soon flattened out exposing broad sorus. 

 Cal. 



P. riSZUOSA Link. 



Rtstock creeping, ratner slender: 

 stipes r'ish, passing into a more or less 

 flexuous or zigzag rachis; fronds 6-30' 

 long , ovate-oblong, 2-3-pinnate; secon- 

 dary and tertiary rachises com deflected 

 and zigzag, rusty puberulent or nearly 

 smooth; pinnae mostly alt; ultimate 

 pinnules 5-10" long, roundish-ovate or 

 subcordate, smooth; margins at first re- 

 flexed, soon flattened out. Tex; Cal. Syn- 

 onym: Allosorus flexuosus Kaulf. 

 F. IHTEEMBDIA Mett. 



Rtstock long, wide-creeping, slender, 

 chaffy; stipes scattered, 4-6' long, pink- 

 ish-stramineous, smooth; fronds o-lO 

 long 3-8' wide, ovate-bipinnate; pinnae 

 nearly opp, remote; pinnules 2-6 pairs, 

 petiolate, subcoriaceous, oval or corda^c- 

 ovate'; veins obscure, rachises not pub- 

 escent. Huechuca mts, Ar (Lemmon). 



Tribe CEBATOPTERIDEAE. Sori on 

 2 or 3 longitudinal veins which are near- 

 ly parallel with edge of frond aquatic 

 CERATOPTERIS Brong, soc Philom b 

 1821:1 84. . 



Characters of the tribe. 

 C. THALICTROIDES Brong. Soc Plnlom 

 b" 1821:186 t 1. 



Floating fern. Southern Ma. the onlj 



