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| May 2007 at Tsukuba Botanical Garden |
| Family | Dryopteridaceae |
| Scientific name | Dryopteris nipponensis Koidzumi |
| Synonyms | Aspidium cystolepidotum Miquel; Dryopteris ambigens (Nakai) Koidzumi; Dryopteris cystolepidota (Miquel) C. Christensen; Dryopteris cystolepidota (Miquel) C. Christensen var. dilatata H. Ito; Dryopteris erythrosora (D. C. Eaton) O. Kuntze var. ambigens Nakai; Dryopteris erythrosora (D. C. Eaton) O. Kuntze var. cystolepidota Makino; Dryopteris erythrosora (D. C. Eaton) O. Kuntze var. dilatata (Koidzumi) Sugimoto; Dryopteris nipponensis Koidzumi var. dilatatum Koidzumi; Dryopteris taquetii H. Christ; Polystichum cystolepidotum (Miquel) Franchet & H. Léveillé |
| Common name | (Japanese common name) tougoku-shida [Mt. Togoku's fern] |
| (English common name) none | |
| Distribution | (Japan) Honshu, Shikoku, Kyushu |
| (Other nations) none | |
| Chromosomal number | n=123 (3x) |
| Description | Leaves pinnately decompund, 30-70cm length, 20-35cm width. Evergreen. Terrestrial. |
| Reference | Dryopteris cystolepidota (Miq.) C. Chr. |
| Dryopteris nipponensis | |
| Note | Some authors may argue that Dryopteris nipponensis Koidzumi is a synonym of Dryopteris erythrosora (D. C. Eaton) Kuntze. However, based on obvious difference in surface and edge of leaflets as well as sporangia, Dryopteris nipponensis Koidzumi is thought to be a different species from Dryopteris erythrosora (D. C. Eaton) Kuntze by most Japanese authors. |
| Photos below are those of a fern which was cultivated by the Tsukuba Botanical Garden and displayed as Dryopteris erythrosora var. dilatata. |
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| May 2007 at Tsukuba Botanical Garden |
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| May 2007 at Tsukuba Botanical Garden |
May 2007 at Tsukuba Botanical Garden |
May 2007 at Tsukuba Botanical Garden |
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| May 2007 at Tsukuba Botanical Garden |
May 2007 at Tsukuba Botanical Garden |
