106 ENGLISH BOTANY. 



Dickieana in the degree of division of the pinnae and the rounded 

 pinnules or segments. Besides the similarity of the spores Dickieana 

 agrees with alpina in many of the ultimate veins running into the 

 notches at the margin of the frond, and not into the teeth which border 

 the notches. The notches, however, are much deeper in 0. alpina, 

 var. a, than in var. Dickieana, and in the latter the veins frequently 

 run to the margin of the segment, where there is neither tooth nor 

 notch. In 0. eu-fragilis the veins, with scarcely any exception, run 

 into projecting teeth. When first I read that Milde put Dickieana 

 under alpina, I doubted, now I am quite convinced he was right. 



Under C. alpina Milde includes Cystopteris Canariensis of Presl, 

 which has the indusium studded with cylindrical hair-like glands ; 

 to this Midle refers the C. sempervirens of Moore, ' Nat. Print. Brit. 

 Ferns,' 8vo ed. p. 268, which has been reported from Tunbridge Wells, 

 Kent and Devon ; but it seems probable it has either been planted or 

 has escaped from cultivation in both places; it may be a distinct 

 subspecies, as it has a tough (not fragile) stipes, and a frond which is 

 evergreen if protected from frost, which is not the case with the fronds 

 of either eu-fragilis, alpina, or Dickieana. I have specimens from the 

 Canaries, from the late Mr. P. B. Webb, name Oyathea gracilis, Sm. 

 These have the spores quite similar to those of C. alpina ; but Moore 

 says the spores of his C. sempervirens are muricate, so probably 

 Canariensis and sempervirens are not identical. 



Alpine Bladder-fern. 



SPECIES IL-CYST OPT ERIS MONTANA. Bemk 



Plate 1868. 



Babenh. Crypt. Vase. Exsicc. No. 62. 



C. myrrhidifolia, Newm. Hist. Brit. Ferns, ed. iii. p. 97. 



C. Allioni, Newm. Phyt. 1851, App. xxv. 



Cyathea montana, Sm. Mem. Acad. Eoy. Sc. Journ. Vol. V. p. 417. 



Aspidiura montanum, Swartz in Schrad. Journ. Bot. Vol. II. p. 42 (1800). 



Polypodium montanum, Lam. Fl. Fr. Vol. I. p. 23 (1778). 



P. myrrhidifolium, Villars, Fl. Delph. p. 114 (1785). 



Caudex elongated, slender, creeping, dividing into elongate slender 

 branches, not covered by the approximate bases of former fronds. 

 Fronds solitary, distant, produced from the sides of the branches of 

 the caudex. Stipes from as long as to three or four times as long as 

 the lamina, slender, not very brittle, with a few ovate-lanceolate 

 acuminate entire very pale brown or white and hyaline gland-fringed 

 and gland-tipped scales towards the base, and a few scattered nar- 

 rowly lanceolate deciduous ones in the upper part, and also numerous 

 minute cylindrical glands. Lamina perishing in autumn, deltoid, 



