45 



oides Michx. 



A. FASVULUM Mart & Gal. 



Fronds tufted, erect, - rigid, 4-10' long-, 

 narrowly linear-lanceolate; stipe and 

 rachis bk and shining; pinnae num, ob- 

 long, obtuse, entire or crenulate, aur- 

 icled on upper side, nearly sessile; mid- 

 dle pinnae longest, lower gradually 

 shorter and deflexed; sori short, abund- 

 ant. Va; SC; Fla; Ark; NM. Synon- 

 yms: A. ebeneum minus Hooker. — A. 

 resiliens Kunze. 

 A. TBICHOMANES L. 



Stipes densely tufted, p-brown, shin- 

 ing; fronds 3-S' long, y 2 ' or more broad, 

 linear; pinnae 15-30 pairs, nearly opp, 

 roundish-oblong or oval, the 2 sides un- 

 equal, obliquely wedge-truncate at base, 

 attached by a narrow point, edge slight- 

 ly crenate, midvein forking and evanes- 

 cent; sori 3-6 on each side of midrib. 

 Eastern. US to Pacific Coast. Synonvm: 

 A. melanocaulon AVilld. 

 Variety INCISUac: Moore 



Fronds larger, often %' or more broad, 

 pinnae more or less deeply incised. Vt. 

 A. MONANTHEMUM L. 



Stipes densely tufted, 3-6/ long, chest- 

 nut brown; fronds 6-12' long, narrow, 

 with 20-40 pinnae on each side; pinnae 

 crenate above, abruptly narrowed at 

 base, oft auricled, lower much reduced; 

 texture subcoriaceous ; veins flabellate; 

 sori 1-2. linear-oblong, parallel with low- 

 er edge of pinnae. Huachuca mts, Ar 

 (Leramon). 



I. — AA. — Rachis g. 

 A, VIKIBE Huds. 



Stipes densely tufted, 2-4' lone" naked 

 lower part chestnut brown; fronds 2-6' 

 long, y 2 ' broad, with 12-20 pinnae on 

 oach side which are ovate or rhomboid- 

 al in outline, upper edge narrowed sud- 

 denly at base, lower obliquely truncate, 

 outer part deeply crenate; raches naked; 

 sori copious. Vt ; Can; New Brunswick. 

 A. T53S>i TAT JJW, E. 



Stipes tufted, 2-6' long, naked, eben- 

 eous below; fertile fronds 2-3' long, 1' 

 broad, with 6-8 pairs of stalked, oblong- 

 rbomboidal pinnae, lower side truncate 

 with a curve, outer edge irregularly 

 crenate; sterile fronds smaller on short- 

 er stipes; rachis naked; sori copious in 

 parallel rows. Fla; SC. 



II. — Pinnae onlv 2-5, linear-cuneate. 

 A. SEPTENTSIOSIALE Hoffm. 



■Stipes densely tufted, 3-6' long, slen- 

 der, naked, ebeneous toward, base; fronds 

 irregularly forking, consisting of 2-5 

 narrow^ linear rather rigid segs, which 

 are entire or more frequently cleft at 

 end into few long narrow teeth; sori 

 elongate, near margin, com facing each 

 other in pairs, com 2-3 to each seg. NM; 

 Colo. 



III. — Pinnae num, linear or linear-ob- 

 long ac^te or acuminate. 



A. ANGUSTIPOLIUM Michx. 



Stipes 1° or more long, brownish, 

 slightly scaly below; fronds iy 2 -2° long. 

 4-6' broad, lanceolate-oblong, flaccid; 

 pinnae 20-30 pairs, linear-lanceolate, 

 aeminate, entire or crenulate, those of 

 fertile fronds narrower; texture thinly 

 herbaceous; sori linear, 20-40 each side 

 of midvein. New England; Ky; Wis. 



A. FIRMUM Kunze. 



Stipes 4-8' long, erect, grayish, naked; 

 fronds %-l° long, 3-4' broa^; pinnae 

 12-zU pairs, obiong-lanceolate, point 

 bluntish, margin inciso-crenate, lappei 

 one narowed suddenly at base, lower one 

 obliquely truncate; sori short, falling 

 short of both midvein and margin, Fla; 

 Ar. 



*»** Fronds 2-3-pinnatifid. A. — Tex- 

 ture somewhat coriaceous. 

 A u BU1A-MUBABIA L. 



Stipes tufted, 2-4' long, naked; fronds 

 ovate-deltoid, 1-2' long, 2-3-pinnate be- 

 low, simply pinnate above; divisions 

 rhombic-wedge-snaped, toothed or in- 

 cised at apex; veins flabellate; sori few, 

 elongate, soon confluent. Vt; Mich; Ky. 



MOWTAMUM Willd. 

 Stipes tufted, 2-3' long, naked; fronds 



2- 5' long, ovate-lanceolate, pinnate; 

 pinnae 3-7-parted below, incised or 

 toothed above; veins ooscure; sori short, 

 basal ones sometimes double. Ct; NY; 

 Ga; Ky; Ark. 



n.. vcjjjtlJk'&lZlX Baker. 



Caudex erect, with dark brown, linear- 

 setaceous scales; stipes densely tufted. 

 y 2 -l' long, castaneous; fronds 3-4' long, 

 oblanceolate, bipinnate; pinnae 20-25 

 pairs, lanceolate, lower gradually re- 

 duced, cuneate-truncate; pinnules 5-6 

 pairs, oblong, toothed or externally sub- 

 entire; sori 1 at base of each pinnule or 

 2 or more on lowest anterior. Huachuca 

 mts. Ar (Lemmon). 



****AA. — Texture thinly herbaceous or 

 membranous. 



A. EBADLEYI D. C. Eaton. 



Stipes tufted, 2-3' long, ebeneous, as 

 also lower half of rachis; basal scales 

 brown-bk, lanceolate-acuminate; fronds 



3- 7' long, oblong-lanceolate, bipinnatifid ; 

 pinnae 8-12 pairs, short-stalked or ses- 

 sile, ovate-oblong, lowest not reduced, 

 largest pinnatifld with oblong lobes 

 toothed at tip; sori short, near midvein. 

 NY; Tenn; Ky: Ark. 



A. MYSIOPM OjXiUM Presl, Rel Haenk 

 1:48 (1830). 



Stipes tufted, 2-6' long; fronds 3-10' 

 long, delicately membranous, lanceolate, 

 narrowed below, 2-3-pinnate; ultimate 

 segs obovate-oblong, entire or 2-3-lobed: 

 veins single in each seg, bearing below 

 middle a solitary oblong sorus. Fla 

 Synonyms: A. rhizophyllum myriophyl- 

 lum Mett. — Caenopteris myriophyllum 

 Swz Fl Ind Occ 3:1626 (1806). 

 A. CICUTABIUM, Swz, Prodr Veg Ind 

 Acc 130 (1788). , , _ 



Stipes tufted, 4-8' long, g'ish, naked; 

 fronds 6-15' long, 4-6' broad, with 10-15 

 horizontal pinnae on each side, lower 

 ones 2-3' long, 1' broad, cut down to 

 rachis into linear or oblong segs, which 

 are once or twice cleft at apex; rachis 

 compressed, oft winged; sori principally 

 in 2 rows. Fla. 



Section ATHYRIUM Roth. See Athyr- 



AMBYEIUM Roth, Tent Fl Germ 3:58 

 (1800). , , 



Veins free; son more or loss eurvea, 

 sometimes horseshoe-shaped; oft cross- 

 ing to outer or lower side of fr tng vein- 



