ASPLEXIOI.] FILICES. 461 



2. A. jrerman'icum, Weiss ; frond oblong-lanceolate pinnate, pinnae 

 few distant alternate cuneate-lanceolate simple toothed or lobed. A. alter- 

 nifolium, Wulf. 



Rocks, very rare, Wales, N. of England, Roxburgh, Perth, and Fife ; absent 

 from Ireland ; frt. June-Sept. Rootstock densely tufted, creeping, without 

 scales.. Stipes 2-4 in., .very many, slender, erect, black below. Fronds 

 rather flaccid, 2-3 in. ; pinnae 7-9, g-f in., very variable in form, sometimes 

 fan-shaped, lower shortly petioled, irregularly 2-3-lobed ; lobes crenate or 

 toothed ; midrib obsolete, veins forked. Sort 2-4 on each pinna or segment, 

 parallel, linear-oblong ; involucre entire, at length covering the breadth, 

 but not the length of the segments. DISTRIB. Europe, excl. Greece and 

 Turkey. 



3. A. septentriona'le, Hull ; frond linear-lanceolate inciso-pinnatifid, 

 pinnae narrow erect, tips incised. 



Walls and rocks, rare, N. Devon, Wales ; ascending to about 3,000 ft. north- 

 wards to Perth and Aberdeen ; absent from Ireland ; frt. June-Oct. 

 Rootstock densely tufted, hardly scaly. Stipes many, 3-4 in., erect, rigid, 

 black below. Frond coriaceous, 1-2 in., lanceolate, simple or cleft into 

 slender subpetioled segments ; midrib obsolete ; veins forked. Sori 1-4 on 

 each pinna, parallel, at length covering the pinna; involucre narrow. 

 DISTRJB. Europe, Siberia, W. Asia to the Himalaya, N. America. 

 ** Ultimate pinnules with a distinct midrib. 



4. A. Trichom'anes, L. ; fronds linear pinnate, rachis rigid chesnut- 

 brown, pinnae -f in. many subsessile. 



Walls and rocks ; ascending to nearly 2,000 ft. in Wales ;. frt. May-Oct. Root- 

 stock stout, shortly creeping ; scales few, subulate, blackish. Stipes 1-4 in., 

 crowded, naked, polished, red-brown, black below. Frond 6-12 in., rigid ; 

 pinnae 15-40, horizontal, dark green, lower smaller, base obliquely cuneate 

 truncate rounded or auricled, sometimes incised ; midrib subcentral ; veins 

 few, oblique, forked above the middle. Sori oblique, short ; involucre 

 pale brown, entire or erose. DISTRIB. Europe, N. Africa, N. and W. Asia, 

 N. America, S. temp, regions. Var. anceps, Sol. (sp.), is simply a larger 

 form. 



5. A. vir'ide, Huds. ; fronds linear pinnate, rachis green slender, 

 pinnae \~\ in. many subpetiolate rhombic-ovate crenate. 



Wet rocks in mt. districts, from S. Wales northwards ; ascending to nearly 

 2,800 ft. in the Highlands ; W. of Ireland ; frt. June-Sept. Allied to 

 A . Trichomanes, of which it may be regarded as an alpine sub-species, dis- 

 tinguished^ by its more flaccid habit, pale rachis, shorter paler and sub- 

 petioled pinnae. DISTRIB. Europe (Arctic), Siberia, W. Asia, N. America. 



6. A. mari'num, L. ; frond oblong or lanceolate coriaceous pinnate 

 below, pinnas 1-2 in. oblong-ovate crenate. 



Sea-cliffs and caves ; frt. June-Sept. - Rootstock stout, inclined, clothed with 

 purple-brown chaffy scales. Stipes 3-6 in., many, red-brown below, stout, 

 polished. Frond 3-10 in., coriaceous; rachis stout, winged, green; pinnae 

 few or many, acute or obtuse, base truncate cuneate or cordate, auricled 

 above, margin sinuate-lobed or serrate, upper confluent ; midrib and forked 

 veins obscure. Sori large, oblique; involucre coriaceous. DiSTKlB. France, 

 Spain, Italy, N. Africa, Brit. N. America. 



