518 FILICES. [Nephrodiuj.i. 



eglandular. N. foznise'cii, Lowe ; Lastrea rccur'va, Bree ; L. ce'mula, 

 Brack. 



Hilly districts, from Orkney southd., local ; Ireland ; frt. July-Sept. — Hardly 

 distinct from N. spinulosum, frond more triangular and divided, remark- 

 ably concave and curved upwards ; scales more fimbriate and undulate, 

 glands of involucre sessile. — Distrib. Europe, Madeira, Azores. — Smells 

 of hay. 



6. N. Thelyp'teris, JDesv. ; rootstock creeping,' stipes naked, frond 

 lanceolate pinnate, pinnae deeply pinnatifid, margins entire recurved. 

 Bogs and marshes, Forfar to Kent and Somerset ; local in Ireland ; frt. 



July-Aug. — Rootstock long, black, hardly scaly. Stipes 1 ft., slender, straw- 

 coloured. Frond 1-2 ft., membranous, glabrous or sparingly hairy beneath : 

 pinnae 2-3 in., spreading, cut to the rachis into narrow oblong entire ob- 

 tuse lobes ; upper venules simple, lower forked. Sori small, dorsal on 

 the venule. Involucre gland-ciliate. — Distrib. Europe, Asia, Africa, N. 

 America, N". Zealand. 



7. N. Oreop'teris, Desv. ; rootstock short tufted, stipes naked above, 

 frond pinnate, pinnae pinnatifid glandular beneath, margins entire flat. 

 iV. monta'num, Baker. 



Mountain heaths and pastures, N. to Shetland ; ascends to 3,000 ft. in the 

 Highlands ; local in Ireland ; frt. July-Aug. — Rootstock erect or decumbent, 

 and short stout stipes and rachis below scaly. Frond l|-2 ft., broadly 

 oblong-lanceolate ; pinna? 3-4 in., spreading, sessile, lanceolate, lower 

 smaller more obtuse and distant ; lobes flat, obtuse, entire, costa pubescent ; 

 lower venules forked. Sori near the margins. Involucre membranous. — 

 Distrib. Europe (excl. Sweden), W. Asia. — Fragrant. 



13, POLYPO'DIUM, L. Polypody. 



Ferns of various habit. Fronds simple, lobed, pinnatifid or compound. 

 Sori dorsal, globose ; involucre 0. — Distrib. All regions, but chiefly 

 trop. ; species 390,-^-Etym. ttoXvs and irovs, from the many stipes of 

 some. 



Section 1. Polyp o'dium proper. Stipes articulate with the rootstock. 



1. P. vulga're, L. ; rootstock creeping densely scaly, fronds alternate 



pinnatifid, segments linear-oblong obtuse or acute entire crenate-serrate. 



"Walls, banks, trees, &c, N. to Shetland ; ascends to 3,400 ft. in Yorkshire ; 



Ireland; Channel Islands; frt. June-Sept. — Rootstock stout; scales pale 



brown, lanceolate. Stipes stout, 3-4 in. Frond 6-12 in., linear-oblong or 



ovate-oblong, coriaceous, naked and glabrous; segments \-\ in., broad: 



venules pinnate, tips thickened. Sori large, 1-seriate, terminal on a lateral 



venule. — Distrib. Europe, N. and S. Africa, N. and W. Asia, N. America. 



P. cam'bricum, L., is a var. with pinnatifid segments. 



Section 2. Phegop teris. Stipes not articulate with the rootstock. 



