582 



CVIII. POLYPODIACE^. 



[ Woodsia. 



3. P, Dnjopteris L. (tender tJiree-hranchcd P.) ; fronds ter- 

 nate biplnnate thin and membranaceous glabrous, divisions 

 spreading and deflexed, the segments obtuse subcrenate, sori 

 marginal, root-stock filiform. £J. B. t. 616. 



I 



Dry stony places, in mountainous countries. 

 land. 



Common in Scot- 



4. P. calcdreum Sm. (rigid three-branched P.) :, fronds ternate 

 biplnnate rather rigid subpubescent and always minutely crlan^ 

 dular beneath, divisions sometimes spreading and deflexed 

 segments obtuse somewhat crenate, masses of capsules crowded 

 finally confluent. E. B. t. 1525. 



Matlock baths, and other parts of Derbyshire, In broken limestone 

 ground. Cheddar Cliffs; Coldwell Rocks, Herefordshire; Tno-le, 

 borough, &c. — Distinguished from the preceding by its thicker and 

 more rigid texture, consequently more erect habit, its more pectinate 

 subdivision, and by the minute pubescence covering the racliis and 

 midrib of the pinned ; but we consider it a very doubtful species. 



5. P. alpestre Hoppe (Alpine P.) ; glabrous, fronds oblono-. 

 lanceolate bipinnate, pinnules oblong-ovate sometimes slightfy 

 falcate subacute sessile membranaceoits pinnatifid, segments 

 more or less deep ovate inciso-serrate sometimes scarcely mu- 

 cronate, secondary rachis and main rachis above wino-ed, 'stipes 

 with large scales. Aspidium alpestre, Sehkh. Ftl p. 58. t. 62 

 (A. umbrosuua on the plate) excellent. Pseudathyrium alpestre, 

 Newm, Brit. Ferns, ed 2., p. 199, with wood-cut. Pseuda- 

 thyrmm flexde, "^^ 



(state with the r 



Mountains of Invernessshire and Forfarshire; elevation from 

 2,000 to 4000 feet.— Detected and determined by Mr. Watson in July, 

 1841 but we believe it bad been previously gathered and preserved 

 m hexh-<ivia^s AspleniumFdixfcemina, with which it is frequently found 

 associated. Itmay hence be inferred, as is really the case, that it has 

 great general similarity with that fern. ■ The fructification, hoNvever, 

 truly that of a Polypodium, will at once distinguish it. Mr. Back- 

 houses Glen Prosen var.", which we have received from that gen- 

 tleman, and which constitutes the Pseudathyrium flexile of Mr. 

 Newman, is exactly intermediate between the ordinary or more per- 

 fectly developed form and the figure of P. flexile given by Mr. New- 

 man, and indeed is identicaf with several of the specimens sent by Mr. 

 Croall from the White Water, Clova, as a common state of the species. 



4. WooDsiA Br. Woodsia. (Tab. IX. f. 3.) 



_ Sori scattered, roundish, having, beneath, an involucre which 

 IS cut at the edge into many, often capillary, segments. ]!^amed. 



New 



Mono 



Woods. 





t- 



1 



