Common fragile fern (Cystopteris fragilis) growing in Simonby, Ålön — ⓘ

Cystopteris fragilis (Simonby, Ålön) | Source

family

Cystopteridaceae

Fragile ferns

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2 genera:

Cystopteris
Gymnocarpium

Description

Ferns with two vascular bundles in the stipe that have curved xylem in cross-section. The vascular bundles unite towards the base of the blade to form a V-shape. Leaf veins terminate at the margin.

Occurrence map Fragile ferns (Cystopteridaceae) in Finland — ⓘ

Source

References:

Rothfels, Carl J., et al. (2012). A revised family–level classification for eupolypod II ferns (Polypodiidae: Polypodiales). Taxon, 61(3), 515-533. doi: 10.1002/tax.613003