Vitfaria, Adiantum. 73 



V. VITTARIA, Sm. Grass-fern. 



Sori linear, continuous, in two-lipped marginal grooves or in 

 slightly intramarginal lines, with the unaltered edge of the frond 

 produced beyond and often rolled over them, but without special 

 indusia. Fronds narrow, grass-like. Veins free. 



I T^NIOPSfS, J. Sm. 



1. V. lineata, Swz. Fronds 6' — 18' long, i" — 5" broad, nar- 

 rowed gradually downward to a stout compressed stem, the edge 

 often reflexed. Sori in a broad intramarginal line in a slight fur- 

 row, the edge of the frond at first wrapped over it. Fla. VI. 



VI. ADIANTUM, L. Maidenhair. 



Sori marginal, short, covered by a reflexed portion of the more 

 or less altered margin of the frond, which bears the sporangia on 

 its under side from the approximated tips of free, forking veins. 



I EUADIANTUM. 

 * Fronds at least bipinnate, pinnules flabellate or cuneate. 

 \Fronds smooth. 

 ■> I . A. Capillus-Veneris, L. (Venus' Hair). Stipes nearly 

 black, polished, very slender; fronds ovate-lanceolate, delicate, 

 bipinnate, the upper half or third simply pinnate ; pinnules and 

 upper pinnae wedge-obovate or rhomboid, rather long-stalked, 

 the upper margin rounded and more or less incised, crenated, or 

 acutely dentato-serrate, except where the margin is recurved to 

 form the lunulate separated indusia. Va., Ky. and Fla. to Utah 

 and Cal. VI. 



2. A. tenerum, Swz. Stipes 1° high, erect, glossy ; fronds i" 

 — 3° long, 9' — 18' broad, deltoid, tri— quadripinnate ; pinnules artic- 

 ulated to their petioles, falling off at maturity, cuneate, the upper 

 edge rounded or somewhat angular, broadly often, rather deeply 

 lobed; soritoiumerous, roundish or transversely oblong. Fla. VI. 



3. A. emarginatum,* Hook. Stipes rather stout, nearly black, 

 polished ; fronds ovate or deltoid-pyramidal, bi — tripinnate ; pin- 

 nules and upper pinnae ample, smooth or nearly so, rounded or 

 even reniform, upper margin rounded, slightly incised ; sori 2 — 5 

 transversely linear-oblong, subcontinuous. {A. Chilense of check 

 lists). Cal. and northward. IV. 



^^ Fronds pilose with whitish hairs. 



4. A. tricholepis, Fee. Stipes smooth, polished, deep black; 

 fronds oval ; pinnules roundish, moderately long petioled ; sori 

 few (3—7), of unequal size; indusia very velvety. [A. pilosum of 

 check lists). Western Tex. V. Very rare. 



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