CONTENTS 
XV 
British Ferns (continued ) — pa oe 
14. The Mountain Polypody (Polypodium phegopteris) . 259 
lo. The Three-branched Polypody (Polypodium dryopteris). 263 
16. The Limestone Polypody (Polypodium calcareum ) . . 266 
17. The Alpine Polypody (Polypodium alpestre) . . . 269 
18. The Hard Prickly Shield Fern (Polystichum aculeatum) 272 
19. The Soft Prickly Shield Fern (Polystichum angulare) . 276 
20. The Holly Fern (Polystichum lonchitis ) .... 280 
21. The Brittle Bladder Fern (Cystopteris frayilis) . . 284 
22. The Alpine Bladder Fern (Cystopteris regia) . . 288 
23. The Mountain Bladder Fern (Cystopteris montan a ) . 29d 
24. The Oblong Woodsia ( Woodsia ilvensis) .... 303 
2d. The Alpine Woodsia ( Woodsia alpina) .... 307 
26. The Male Fern (Lastrea filix-mas) ..... 310 
27. The Broad Buckler Fern (Lastrea dilatata) . . . 314 
28. The Hay-scented Buckler Fern (Lastrea recurva) . . 318 
29. The Rigid Buckler Fern (Lastrea rigida) . . . 322 
30. The Crested Buckler Fern (Lastrea crist at a) . . 327 
31. The Prickly-toothed Buckler Fern (Lastrea spinulosa) . 333 
32. The Mountain Buckler Fern (Lastrea montana) . . 336 
33. The Marsh Buckler Fern (Lastrea thelypteris ) . . 340 
34. The Forked Spleemvort (Asplenium septentrionale) . 344 
35. The Alternate Spleemvort (Asplenium germanicum) . 347 
36. The Rue-leaved Spleemvort (Asplenium ruta-muraria) . 350 
37. The Black Maidenhair Spl eemvort (Asplenium adiantum- 
nigrum) ......... 355 
38. The Lanceolate Spleemvort (Asplenium lanceolatum ) . 360 
39. The Rock Spleemvort (Asplenium fontanum) . . . 364 
40. The Green Spleemvort (Asplenium viride) . . . 371 
41. The Common Maidenhair Spleemvort (Asplenium tricho- 
manes) . . . . . . . . .375 
42. The Sea Spleemvort (Asplenium marinum) . . . 380 
43. The Scaly Spleemvort (Asplenium ceterach) . . . 384 
44. The Tunbridge Filmy Fern (Hymenophyllum tunbrid- 
gense) 388 
45. The One-sided Filmy Fern (Hymenophyllum unilaterale) 393 
Index 
397 
