POLYPODIACE.E. 9 



erect, coriaceous, from 3 to 5 in a tuft, arising from a short, globose, 

 squamose rootstock, lanceolate or oblong-lanceolate in form, and con- 

 tracting rather suddenly into a narrow dentate point, smooth on the 

 upper, with scattered, reddish, clavate glands on the under surface, 

 from 3 to 6 inches long and deeply pinnatiftd; segments alternate, 

 spreading and irregular in their length, linear, obtuse, those at the base 

 triangular and decurrent on the short stipes, their margin repand- 

 dentate. Rhachis of a brownish-black colour, subrotund, prominent, 

 and sparsely setose on both sides. Sori round, from 1 to 7 on a seg- 

 ment, solitary and irregular in their disposition. Sporangia intermixed 

 with pinkish-coloured, clavate, articulated glands. 



Allied to the preceding, but distinct and well marked as a species. 



Plate 2. — Fig. 3, 3. Plant, of the natural size. — 3 a. Section of 

 a segment with a sorus. 3 b. Hairs from among sporangia. 3 c. 

 Hairs from under surface of frond. 3 d. Sporangium. More or less 

 magnified. 



11. Polypodium vulgare, Linn. 



Polypodium vulgare, Willd. Spec. PL 5, p. 172; Kaulf. Enum. Fil. p. 100; Hook. Fl. 

 Bor. Am. ii. p. 258. 



Yar. (3. Frondibus magnis triangulari-oblongis, laciniis serratis. 



Hab. Port Discovery, Straits of Juan de Fuca, and sand-hills, vici- 

 nity of Gray's Harbour, Oregon ; (3, Island of Madeira. 



We do not find that the Oregon plant differs in any important par- 

 ticular from the European form of the species ; the outline of the 

 fronds and position of the sori being similar ; with the segments per- 

 haps a little more acute. In var. (3, the fronds are larger, more 

 membranaceous, with broad, obtuse, serrate segments. 



12. Polypodium intermedium, Hook, et Am. 



Polypodium intermedium. Hook. & Am. Bot. Beech. Yoy. p. 405; Hook. Fl. Bor. 



Am. ii. p. 258. 

 P. Scouleri, Hook. & Grev. Ic. Fil. 56 ? 



3 



