Wood fern
Dryopteris crassirhizoma Nakai
[Dryopteridaceae]
Oshida (オシダ, 雄羊歯)
Lifeform: semi-evergreen or semi-deciduous perennial fern
Distribution: Manchuria - Korea - Japan
Habitat: mesic forest floor
Variety
f. maackii (Milde) Tagawa (キレコミオシダ)
Dryopteris crassirhizoma in Hokkaido
[Left] A D. crassirhizoma community. [Center] a crown. [Right] close-up. Near a junglezym in Tomakomai Experimental forest on September 10 2009.