West Highland Flora

Alpine Woodsia


Woodsia alpina

 

Woodsia alpina

Photo Carl Farmer
13 Jul 2004 Trotternish Ridge, Skye
Whole cluster c 13.5 cm long tip to tip

Rare on alkaline rock in mountains

Fronds c 3-15 cm long.

ID: Fronds as shown, pinnae divided into c 3-5 lobes/pinnules each side.  Underside of rachis has narrow brown scales, a few also on underside of pinnae.

Other features: Looks similar to Brittle Bladder Fern, which grows in the same habitat, but has fronds narrower and more parallel-sided.  BBF has lower half of rachis blackish, very few brown scales on the rachis, none on the pinnae, and some pinnae with well over 5 pinnules on each side.

Sori covered by a whitish indusium divided into hair-pointed segments; those of BBF are not divided.

 

Woodsia alpina

Photo Carl Farmer
13 Jul 2004 Trotternish Ridge, Skye
Picture estimated 4 cm wide

  Woodsia alpina

Photo Carl Farmer
13 Jul 2004 Trotternish Ridge, Skye
Central pinna c 4.5 mm long

 

Woodsia alpina

Photo Carl Farmer
13 Jul 2004 Trotternish Ridge, Skye
Third pinna from bottom on right c 6.5 mm long


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