Dryopteris crassirhizoma

Dryopteris crassirhizoma is a fern species in the wood fern family Dryopteridaceae.

This semi-evergreen fern grows to 1 m tall and broad, with narrowly-divided fronds growing in a vase-like shape from a central crown, which is brown in colour.

It has gained the Royal Horticultural Society's Award of Garden Merit.

The acylphloroglucinols (flavaspidic acids ) isolated from D. crassirhizoma show in vitro antibacterial and fatty acid synthase inhibitory activity. Also, the constituents sutchuenoside A and kaempferitrin have in vivo antiparasitic activity.