83 



34 



T: X.ANCEOX.ATA R. Br. 



Rtstock creeping; stipes 1-2' long; 

 fronds simple, 6-13' long', %-%' broad, 

 tapering both ways, edge entire or Borne- 

 times crisped, midrib prominent; veins 

 immersed, exterior ' free and clubbed at 

 apices; sori anti-marginal, in a continu- 

 ous line near apex. Old Rhodes Key, 

 Fla (Curtiss). Synonyms: Lingua cer- 

 vina Plum.- — Pteris lanceolata L. — ■ 

 Pteropsis lanceolata Desv.~— Neurodium 

 lanceolata Fee. 



Tribe VITTABIEAE. Sporangia borne 

 in a continuous marginal or intramarg- 

 inal furrow. 



VIT^ABIA J. F. Smith, Ac Roy Sci 

 Turin mem 5:41 3 (1793). 



Fronds simple, linear, grass-like. 

 Grass-fern. Thirteen tropical sp. 

 V: IsIlTEATA J. E. Smith, Ac Roy Sci 

 Turin mem 5:413 (1793). 



Fronds 6-18' long, 1-5" broad, nar- 

 rowed gradually downward to a stout 

 compressed st, edge often reflexed; sori 

 in a broad intramarginal line in a slight 

 furrow, edge of frond at first wrapped 

 over it. Fla. Synonym: V. angustifrons 

 Miehx.— -Pteris lineata L. Sp PI 1073 

 (1753). 



Tribe PTER.IDEAE. Sori marginal or in- 

 tramarginal, provided with an indusium 

 formed of the reflexed margin of frond, 

 opening inwardly. 



*Sporangia borne on a reflexed portion 

 of margin of frond. Adiantum. 

 **Sporangia borne on a continuous vein- 

 like receptacle which connects apices of 

 veins. Pteris. 



***Sporangia at or near the ends of 

 unconnected veins, borne on under sur- 

 fiee of frr>n"d. Cheilanth.es ; Crypto- 

 gramme; Pellaea. 



Genus ADIANTUM Linnaeus. 

 Sp PI 1094 (1753). 



Sori com num and distinct. Midrib of 

 pinnules near lower margin or 0. Over 

 80 sp mostlv tropical Am. Maidenhair. 

 Section ETTABlAlTOtrxtf. 

 * Fronds at least bipinnate, pinnules fla- 

 beilate or cuneate. 



I. — Fronds smooth. 

 A. CAFlT.r,m-VENET£I3 D, Sp PI 1096. 

 Da 20. B 2:342 d. Greene, Cal ac b 2 : 

 415. Cruz. P. 1:208, Ce-lm*. 



Stipes nearly bk, polished, very slen- 

 der; fronds ovate-lanceolate, delicate, bi- 

 pinnate. upper half or third simply pin- 

 nate; pinnules and upper pinnae weUge- 

 obovate or rhomboid, rather long-stalked, 

 upner margin rounded and more or less 

 incised, crenate, or acutely dentato-ser- 

 rate, except where margin is recurved to 

 form the lunulate senarted indusia. Va; 

 Ky; Fla; Ut; Raja! CD! SD Co! 



Venus-hair or black maidenhair fern. 

 United States. Mexico. 



A. TENEBUM Swz, Fl Ind Occ 3:1719 

 (1806). 



Stipes 1° hi, erect, glossy; fronds 1-3° 

 long, 9-18' broad, deltoid, tri-quadripin- 

 nate; pinnules articulated to their 

 petioles, falling off at maturity, cuneate, 

 upper edge rounded or somewhat angu- 

 lar, broadly often rather .deeply lobed; 

 sori num, roundish, or transversely ob- 

 long. Fla. 



A. SOM^A^l Muell, in bot ^eit 22:25 t 

 1 f 1. B 2:485 as A emarginatum. 



Stipes rather stout, nearly bk, polish- 

 ed; fronds ovate or deltoid-pyramidal, 

 bi-tripinnate; pinnules and upper pinnae, 

 ample, smooth or nearly so, rounded or 

 even reniform, upper margin rounded, 

 slightly incised; sori 2-5, transversely 

 linear-oblong, subeontinuous. Cal; Ore; 

 NM; Nev; SD! Baja! Synonyms: A, 

 ©marginatum Hooker. — A. tenerum 

 Tor rey. 



California; Nevada; N. M.; Oregon. 



II. —Fronds pilose, with w'ish hairs. 

 A: TMCIOLEPIS Fee. 8 me Mem Fam 

 Fong 72 (1854-57). 



Stipes smooth, polished, deep bk; 

 fronds oval; pinnules roundish, moder- 

 ately long-stalked; sori 3-7, of unequal 

 size; indusia very velvety. West Tex; 

 NM. Synonym: A. dilatatum Nuttall. 

 ""^ Fronds dichotomousiy forked, with 

 num pinnae springing from upper side 

 of the two branches. 



A. FEMTUM L, Sp PI 1095. B 2:342. 

 Z 1:148; 2:151. Greene, Cal ac b 2:415, 

 Cruz. 



Stipes 9-15' long, dark chestnut-brown, 

 globrous fronds nearly circular in out- 

 line; central pinnae 6-7' long 1-2' broad' 

 pinnules triangular-oblong, short-stalked 

 sori roundish or transversely oblong. 

 Maidenhair. Nova Scotia; BC; Alk; Ga; 

 Miss; Ark; Kans; Ut; Cal. , 



Venus-hair fern; Black Maidenhair. 

 Variety B> ANGIEE RlKTf M Burgess. 



Pinnules longer-stalked and deeply 

 cleft into narrow-toothed lobes on up- 

 per side. Mt. Findlayson BC. 



A. AEl'HlOFlCtJM, Baker, Syn Fil 123. 

 B 2-3 1 2, in part as A. emarginatum. 

 A. AUSESI 0 ASTtf M Carnutus, Can PI 

 Hist 7 t 6. B 2:343 as' A. pedatum. 

 A. ' CElIiENSE Kaulfuss. Of Ameri- 

 can authorsrsA. emarginatum fide. B 

 2:342. 



A. COWCmtlVM. r Z 2:151. . 



A. X>II«ATA ff IUM Nutt, in Hook hb. B 



2-342. Identity doubtful. 



A. ETtf ^IfcCl ^AT"tf M Hook, Sp Fil 2 t 



75 Da 20. B 2:342, 485. Z 2:131, 382. 



Br 1:205. Cruz; 218 Rosa. 



PTE&IS U Sb Fl 1073 (1753). 



Sori continuous; indusium delicate, 

 W'ish; midribs of pinnules central. A 

 cosmopolitan genus of over 100 species 

 < including Pteridium). 

 Section E1JPTER.I3 Veins tree stipes 

 tufted, indusium single. , 

 *t,ower pinnae linear undivided. 

 P: £ONG:lF03£A L, Sp PI 1074 (1753). 



Stipes 6-12' long, clothed more or less 

 below with pale brown scales; Ironds. 

 1-2° long, 4-9' broad, oblong-lanceolate; 

 pinnae sessile, 2-5" broad, linear, entire; 

 veins close and fine, com once branched; 

 indusium y'ish-brown. Fla. ^ 

 **Lower pinnae forked or slightly pin- 

 nate blow. ' ^ ^ 

 P: CRETICA L, Mant 1:130 (1767). 



Stipes 6-12' long, erect, stramineous or 

 pale brown; fronds 6-12' long, 4-8' broad, 

 lateral pinnae com in 2-6 opp sessile 

 pairs. sterile ones considerably the 



