64 WOODSIA, 



and costa beneath slightly hahy mixed with a very few narrow 

 pale chaffy scales, fronds linear-lanceolate pinnated, pinnae 

 cordato-ovate membranaceous pinnatifid with few (5 — 7) 

 broadly obovate entire segments, the lower ones remote. — 

 Br. in Linn. Trans, v. xi. p. 173. t. 11. Polypodium, Sw. 

 Presl. E. Bot. t. 2023. P. Arvonicum, Sm. 



Hab. Rocks; Arctic and subarctic countries of the northern hemisphere; 

 very rare in the mountainous parts of the temperate regions; Ha.voj (Hook- 

 er): rare also in Britain. On Snowdon, Wales ; Ben Lawers and in Clova, 

 Scotland. — Some of the small hairy specimens, with a few chaffy scales, as- 

 suredly come very near the preceding ; and I have seen individuals that I 

 have found it difficult to pronounce upon: yet I believe they are really dis- 

 tinct. The present is generally the tallest and most tender and membrana- 

 ceous plant, the fronds much narrower, the lower pinnae distant and gradu- 

 dually becoming smaller from near the middle ; the sori are larger, soon 

 confluent. 



11. W. glabella, Br.; quite glabrous, fronds linear tapering 

 a little below pinnated, with the pinnae very remote towards 

 the short stipes, all of them deltoid thin and membranaceous 

 very obtuse, cut into a few (3 — 7) short rounded or subcuneate 

 nearly entire lobes. — Br. in Richards. App. to Frankl. Journ. 

 p. 39. Hook. Fl. Bor. Am. v. ii. p. 259, t. 237. 



Hab. Subarctic America ; abundant about Great Bear Lake, Dr. Rich- 

 ardson. — This approaches much nearer to the last species than the first : 

 but is more delicate and slender, of a paler colour, quite glabrous, far 

 narrower in the frond and the lower pinuse coming down much lower on 

 the stipes. 



SuBTRiBE III. Sori on the apex of a vein or veinlet, and frequently 

 projecting more or less beyond the margin. Eudicksonie.*;. 



6. Thyrsopteris, Kze. 

 Panicularia, Colla. 

 Sori subglobose, from the apex of thickened veins of por- 

 tions of the frond which are destitute of parenchyme, subse- 

 cund, oblique. Involucre inferior, cup-shaped or between 

 globose and hemispherical, coriaceous, the mouth open or 

 but slightly contracted, entire. Receptacle large, globose, 

 spongy, elevated. Capsules sessile, imbricated, compressed, 

 with a large, oblique, nearly complete ring. Seeds 3-lobed. 

 — Arborescent (?') Fern of Juan Fernandez,ivith decompound 

 glabrous shining coriaceous fronds ; sterile and fertile pinnae 

 on the same frond, hitripinnatijid ; sterile ones with the ulti- 

 mate segments cuneato-lanceolate, obtusely serrated: the veins 

 simple or forked, sunk, disappearing below the points : fer- 

 tile ones similarly divided ; but the foliaceous substance or 

 parenchyme is not present, or closely surrounds the thick- 

 ened rachis and veins, which thus form a much compound 



