Something like 40 species of fern have been recorded on the Isle of Skye. Here are a few examples:

Hart's Tongue Fern (Asplenium scolopendrium)
Maidenhair Spleenwort (Asplenium trichomanes)	Sea Spleenwort (Asplenium marinum)
Black Spleenwort (Asplenium adiantum-nigrum)	Black Spleenwort (Asplenium adiantum-nigrum)
Wall Rue (Asplenium ruta-muraria)	Green Spleenwort (Asplenium viride)
Royal Fern (Osmunda regalis)	Brittle Bladder Fern (Cystopteris fragilis)
Broad Buckler Fern (Dryopteris dilatata)	Broad Buckler Fern (Dryopteris dilatata)
Hay-scented Buckler Fern (Dryopteris aemula)	Hay-scented Buckler Fern (Dryopteris aemula)
Golden or Scaly Male Fern (Dryopteris affinis)	Golden or Scaly Male Fern (Dryopteris affinis)
Hard Shield Fern (Polystichum aculeatum)	Hard Shield Fern (Polystichum aculeatum)
Holly Fern Polystichum lonchitis	Holly Fern Polystichum lonchitis
Parsley Fern (Cryptogramma crispa)	Lady Fern (Athyrium filix-femina)
Beech Fern (Phegopteris connectilis)	Wilson's Filmy Fern (Hymenophyllum wilsonii)
Mountain (lemon-scented) Fern (Oreopteris limbosperma)	Mountain (lemon-scented) Fern (Oreopteris limbosperma)
Common Polypody (Polypodium vulgare s.l.)	Common Polypody (Polypodium vulgare s.l.)
Common Polypody (Polypodium vulgare s.s.)	Common Polypody (Polypodium vulgare s.s.)

Useful links:

British Pteridological Society fern guide West Highland Flora