FILICES. 57 



single name is employed, as ' Betularia,' ' Viridana,' etc. The late 

 Mr. Newman, in the 5th edition of his ' British Ferns,' designates 

 nearly all the Ferns by but a single Latin name. Of course this use 

 of a single name can only be practicable provided there be not two 

 British Ferns with the same specific name. In 1781 Yogler gave the 

 name Polypodium montanum to the plant just described, for which 

 I have retained the name Lastrea Oreopteris although it was not 

 until 1789 that Ehrhart named it Polypodium Oreopteris: but, 

 according to Milde, Lamarck had previously (1778) applied the name 

 Polypodium montanum to the Fern now known as Cystopteris 

 montana. Mr. Newman, who adopted the name " montana " instead 

 of " Oreopteris," used the name myrrhidifolia for Cystopteris montana, 

 as it was named Polypodium myrrhidifolium by Villars in 1875, con- 

 sidering that the name montanum was given to it by Allioni in 1785, 

 which would make Allioni's P. montanum later than Vogler : but 

 Yogler's P. montanum is really later than Lamarck's. Linnaeus seems 

 to have confounded P. Oreopteris with his P. fragrans, and Hudson, 

 in the 2nd edition of his ' Flora Anglica,' gave it the name of Poly- 

 podium fragrans, but this has no claim to be retained. 



Mountain Fern. 



SPECIES IIL-LASTREA FILIX-MAS. Presl, 



Plate 1850. 



Babenh. Crypt. Vase. Europ. Exsicc. No. 23. 



Nephrodium Filix-mas, Bicliard. Hook. fit. Stud. Fl. p. 465. Hook. & Bak. Syn. Fil. 



ed. ii. p. 272. 

 Aspidium Filix-mas, Swartz. Sm. Eng. Bot. ed. i. No. 1458, and Eng. Fl. Vol. IV 



p. 288. Fries, Summ. Veg. Scand. p. 82. Babenh. 1. c. No. 23. 

 Polystichum Filix-mas, Both. Koch, Syn. Fl. Germ, et Helv. ed. ii. p. 978. Gren. & 



Godr. Fl. de Fr. Vol. III. p. 631. 

 Polypodium Filix-mas, Linn. Spec. Plant, p. 1551. 

 Dryopteris Filix-mas, Schott. Newm. Hist. Brit. Ferns, ed. iii. p. 184. 

 Lophodium Filix-mas, Newm. Phytol. 1851, Append, p. 20. 



Caudex short, very thick, separating into few large divisions or 

 crowns, which are also very thick, short or rather short, and decum- 

 bent or more rarely erect, covered by the imbricated bases of former 

 fronds. Fronds all similar, many produced close together from the 

 extremity of each crown, erect or inclined outwards, deciduous or 

 sub-evergreen. Stipes short or rather short ( T V to ^ of the length of 

 its lamina), very stout, flattened or very slightly channelled on the 

 anterior face, containing 5 or 7 or more vascular bundles, without 

 glands or with a few glands beneath, with very numerous lanceolate 

 acuminate entire or denticulate often ciliated pale or dark brown 

 glabrous or slightly glabrous scales, which are partially or wholly 



VOL. XII. I 



