Filices. 177 



XIII.— ^ THYRIUM. 



ATHY'RIUM FELIX- FCE'MINA (no). Lady-fern. 7—8. Rhizome 

 (1778) and stipes covered with numerous brown scales, fronds i — 5 ft. oblong- 

 lanceolate bipinnate, pinnules numerous closely-set oblong serrate 

 lower ones pinnatifid. Moist and shady places. 



XIV. —POL YSTICHUM. 



Sori roundish scattered, indusium circular above the sorus attached by the 

 centre (peltate). Fig. p. 173. 



Fronds linear lanceolate pinnate, .... P. Lonchitis. 

 Fronds lanceolate bipinnate, ..... P. aculeatum. 



Polys'tichura Lonchi'tis (22). Holly Fern. 6 — 7. Fronds densely tufted 



(1788) 6 — 18 in. linear-oblong rigid prickly simply pinnate, pinnae many lance- 

 olate somewhat sickle-shaped closely set, base oblique acutely auricled 

 on the upper side. [G. {Penyghent^ Moicghton.) 



POLYS'TICHUM ACULEA'TUM (100). Prickly Shield-fern. 6—8. 



(1789) Fronds 6 — 12 in. variable lanceolate bipinnate (sometimes simply pin- 



(1790) nate), pinnae ovate oblique at the base the first pinnule on the uppei 

 side being largest, margins serrate, teeth mucronate. Woods and tnoisi 

 shady places. 



XV.—LASTREA. 



Sori roundish scattered, indusium reniform attached by the sinus. 



Fronds pinnate, pinnae pinnatifid, 680 



Fronds bipinnate, 681 



■e ^ , ■ • . I L. spinulosa. 



l*rond tnpmnate, } 



( (See also L. semula.) 



680 Fragrant, under surface covered with yellow 



glands, L. Oreopteris. 



680 Not glandular, L. Thelypteris. 



681 Frond ovato-lanceolate, L. Filix-mas. 



681 Frond oblong-lanceolate, ...... L. rigida. 



68 1 Frond ovato-triangular, 682 



682 Stipes covered with many pale-brown scales, . L. gemula. 



682 Scales on stipes dark-brown in the centre, . L. dilatata. 



LASTRE'A SPINULO'SA (83). Spiny Buckler-Fern. 7—8. Frond 



(1798) I — 14 ft. oblong-lanceolate erect bipinnate the lower pinnae unequally 



triangular the pinnules on the lower side being twice the length of 



those on the upper side, pinnules ovato-lanceolate i in. or more deeply 



pinnatifid or pinnate. Woods and damp shady places. 



