518 FILICES. [NEPHJBODIUM. 



eglandular. N. fcenise'cii, Lowe ; Lastrea recur'va, Bree ; L. m'mula, 

 Brack. 



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

 distinct from JV. 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, Desv. ; rootstock creeping, stipes naked, frond 

 lanceolate pinnate, piimse 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, pinnse pinnatifid glandular beneath, margins entire flat. 



N. 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 ; pinnse 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. iroXvs and TTOVS, from the many stipes of 

 some. 



SECTION 1. Polypo'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 piunatifid segments. 



SECTION 2. Phegop'teris. Stilus not articulate with the rootstock. 



