424 



920. LASTRtEA. 



following. Pinnules oblong, incise. Lobes 

 acutely dentate. Plant abounding in stalked 

 glands. Indusium fringed. Stipe short, dense- 

 ly scaly, p. 6-8. Rocks. Yorkshire. Alps. 

 Grande Chartreuse. 



6. Filix-mas. Frond lanceolate, bipinnate. 

 Pinnse oblong, prolonged ; lower neai'ly as long 

 as the following. Pinnules oblong, with short 

 teeth. Indusium quite entire. Plant not 

 glandular; the chaff of Stipe extending al- 

 most to the extremity of the frond, p. 6, 7. 

 Shade. 



7. pallida. " Stipe chafify between the 

 pinnaj, smooth. Frond oblongo-lanceolate, bi- 

 pinnate. Pinnules sessile, nearly equal at base, 

 and slightly cordate, ovato-oblong, obtuse, 

 acutely denticulate. Indusium of a reddish 

 grey. Sori at last confluent. p. 2-6. 

 Hedges and shady rocJcs. Sic." — Guss. 



8. Oreopteris, Frond pinnate, lanceolate, 

 attenuate. Pinnse oblong, prolonged, pinnati- 

 partite ; the 4 or 5 lower pair much smaller 

 than those above them. Segm. glandular 

 beneath. Margin of the Fertile Frond revo- 

 lute. Sori near the margin. Stipe short, 

 chaify at base. p. 7. Heathy hills. 



9. Thelypteris. Frond ovato-lanceolate, 

 pinnate, on a long and smooth stipe. Pinnse 

 pinnatifid ; lower pair not much shorter than 

 the rest. Segm. oblong, without glands, entire. 

 Margins of the Fertile Fronds revolute. 

 Eoot creeping, p. 7, 8. Bogs, occ. 



921. CYSTEA. 



[In the first three species the outline of the 

 fronds is lanceolate; that of the pinnse may 

 perhaps rather be called ovate prolonged, which 

 is also nearly the fonn of the pinnules, though 

 these are sometimes oblong. In aU, the pin- 

 nules are decurrent by a narrow margin, so 

 that the frond is hardly in strictness bipinnate. 

 The pinnules nearest to the main stem are 

 always more divided than the others. The 

 species aU depend in great measure on the 

 degree in which the division of the L. takes 

 place ; and the gradation is almost insensible 

 from the first to the last.] 



1. dentata. Pinnse pinnate only at base. 

 Lower Pinnules incise, not pinnatifid. p. 7. 

 RocJcs. Wales. Sc. 



2. fragilis, Fi-ond bipinnate. liower Pin- 

 nules pinnatifid ; npper inciso-dentate. p. 6-8. 

 Rocks and walls. 



3. alpina. Frond bipinnate. Lower Pin- 

 nules pinnate ; upper deeply pinnatifid. Segm. 

 lineari-oblong. p. 6-8. High rocks. Alps. 

 Pyrenees. 



4. xuontana. Frond temato-tripinnate ; 

 the lower fiinnce leing much larger than the 

 others. Pinnules pinnatifid. p. 6-8. Moun- 

 tain woods. Alps. 



922. WOODSIA. 



1. hyperborea. Frond lineari-lanceolate. 

 Pinnse broadly ovate, pinnatifid. p. 7. High 

 rocks. Wales. Yorkshire. Sc. Alps. Pyrenees. 

 rare. 



2. ilvensis. Frond oblongo - lanceolate. 

 Pinnse triangulari-oblong, pinnatifid. Segm. 

 oblong, p. 7- High rocks. Very rare. 



Tribe II. ASPLENIE^. 



923. GRAMMITIS. 



1. leptophylla. Frond smooth, thin, pin- 

 nate or bijiinnate. Pinnules cuneiform, with 

 rounded lobes. The sori are said to be round 

 or oblong ; but the capsules are so scattered 

 that they can hardly be said to form sori. 

 p. 3, 4. Sandy. Britt. Prov. It. ' 



924. ATHYRIUM. 



1. Filix-fcemina. Frond lanceolate, bi- 

 pinnate. Pinnules lineari-oblong, pinnatifid ; 

 the lower forward segment rather longer, 

 toothed at the end. p. 6-8. Moist shade. 



j8. irriguum, Sm. Smaller. 



2. fontanum. Frond lineari-lanceolate, bi- 

 pinnate. Pinnules broad, with a few large, 

 spreading, spinescent teeth. Rachis, even the 

 principal, winged, p. 6-8. 



925. ASPLENIUM. 



A. Frond narrowed at base by the position 

 of the loiver branches, which are neverthe- 

 less as long as those above them. Pinnce 

 alternate. 



1. Ruta-muraria. Frond bi-tripinnate. 

 Pinnules rhomboid, nearly entire. Indusium 

 fringed, p. 5-9. Walls and rocks. 



2. Matthioli. Frond bi:tripinnate. Pin- 



