250 POLYPODIUM, § PHEGOPTERIS. 



an obliquely cuneate sessile base ovato-lanceolate pinnatifid 

 halfway down or more to the costule with 5-9 acute spinu- 

 lose subincurved lobes simple or occasionally bifid, veins 

 usually once or twice forked, sori generally as many as there 

 are lobes about equidistant between the costule and the 

 margin. — Colenso, in Tasman. Phil. Journ. Hook. jil. Fl. Nov. 

 Zeal. \\.p. 41. t. 81 [excellent). Met ten. Phegopt. p. 11. 



Hab. New Zealand : Northern Island, Colenso ; Port Nicliol and Akeroa, Mid- 

 dle Island, Lj/all. — A very distinct species, and very uniform in its characters. 



Polypodium anomalum of Arnott and Hooker, in Hook. Journ. Bot. viii. p. 3G0, 

 1. 11, which might be expected to be in the above section, has been recently found 

 by Mr. Thwaites to have occasionally involucres of a true Polysfichum, audit will 

 consequently be found, at p. 27 of this volume, as Aspidium (Polysiichum) ano- 

 malum. 



182. P. (Phegopteris) Dryopteris, L. ; caudex long creep- 

 ing branched more or less scaly, stipes a span to a foot or 

 more long very slender stramineous scaly below, fronds thin 

 membranaceous 5-6 inches and more long pentangular- 

 deltoid tripartito-bipinnate, primary divisions long-petioled 

 (especially the terminal one) deltoid, secondary pinna3 mostly 

 sessile 1^-2 inches long oblong or ovato-oblong rather ob- 

 tuse deeply pinnatifid sometimes again pinnate at their base, 

 segments oval entire or the inferior ones pinnatifido-serrate, 

 veins forked, sori dorsal on the upper veinlet nearer the 

 margin than the costule. — Linn.Bp. PL p. 1555. Engl. Bot. 

 t.&lQ. Sw. Syn. Fil. p. 42. Schk. Fit. t. 25. Willd. Sp. 

 PL V. p. 209. Hook, et Am. Br. Fl. ed. 8.jo. 580. Ledeb. 

 Fl. Alt. a, genuinum ; [his /3 is P. Robertianum) . Hook. 

 Brit. Ferns, t. 4. Phegopteris, Fee. Metten. Phegopt. p. 9. 

 Polypod. calcareum. Ph. N. Am. FL ii. p. 639. 



Hab. Mountain districts throughout Britain and Europe generally. Northern 

 India, Western Himalaya, T. Thomson. Siberia, Japan, Greenland ; Labrador 

 and Hudson's Bay to British Columbia on the Pacific. Rare in the Northern United 

 States ; not found in the South. 



183. p. (Phegopteris) Robertianum, Hofl:m. ; caudex long 

 creeping branched scaly, stipes a span to a foot long strami- 

 neous slender brown at the base, fronds 6-10 inches long 

 rather firm-membranaceous glandularly pubescent at length 

 glabrous subpentangular-deltoidor triangular-ovate tripartito- 

 bipinnate, primary pinucE long-petioled (especially the inter- 

 mediate or terminal one) deltoid-ovate, secondary pinnae 

 mostly sessile oblong or ovato-oblong obtuse deeply pinna- 



