Dryopteris nipponensis




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.



May 2007
at Tsukuba Botanical Garden



May 2007
at Tsukuba Botanical Garden
May 2007
at Tsukuba Botanical Garden
May 2007
at Tsukuba Botanical Garden



May 2007
at Tsukuba Botanical Garden
May 2007
at Tsukuba Botanical Garden