Gymnocarpium dryopteris. Oak fern.

Life-form & Growth Form:

Non-bulbous geophyte. Herbaceous perennial. Rhizome far-creeping. 

Flowering period: 

July and August.


Rocky woodland, ravines, stream banks, cliff ledges and stable block screes. Open, light textured peaty soils with high humus content, also moderate pH mineral soils.  


Peat extraction. Drainage of peatlands. Overgrazing by livestock.  

Static distribution map:
Gymnocarpium dryopteris
Gymnocarpium dryopteris
For an interactive map follow this link to the BSBI webpage