| Family | Dryopteridaceae |
| Scientific name | Dryopteris crassirhizoma Nakai |
| Synonyms | Dryopteris filix-mas (L.) Schott, misapplied; Dryopteris buschiana Fomin; Dryopteris pseudo-filix-mas Nakai & Kodama; Dryopteris setosa Kudo |
| Common name | (Japanese common name) o-shida [male fern] |
| (English common name) thick-stemmed wood fern | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku (Mt. Tsurugi) |
| (Other nations) Russia, Korea, China, Taiwan | |
| Chromosomal number | n=41 (2x) |
| Description | Leaves 60-120cm length, micropinnulus 1.5-2.5cm width. Summer green. Terrestrial. Perennial plants. |
| Reference | Dryopteris crassirhizoma Nakai |
| Dryopteris crassirhizoma Nakai |
| May 2007 at Koishikawa Botanical Garden |
May 2007 at Koishikawa Botanical Garden |
May 2007 at Koishikawa Botanical Garden |
| May 2007 at Koishikawa Botanical Garden |
May 2007 at Koishikawa Botanical Garden |
May 2007 at Koishikawa Botanical Garden |