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| June 2006 at Tsukuba Botanical Garden |
June 2006 at Tsukuba Botanical Garden |
June 2006 at Tsukuba Botanical Garden |
| Family | Ophioglossaceae |
| Scientific name | Ophioglossum namegatae M. Nishida & Kurita |
| Synonyms | Ophioglossum namegatae M. Nishida & Kurita var. longicrure |
| Common name | (Japanese common name) tone-hana-yasuri (トネハナヤスリ, 利根花鑢 [meaning: Tone River rasp flower]) |
| (English common name) none | |
| Distribution | (Japan) Honshu (Kanto region (Tone River area)) |
| (Other nations) none | |
| Habitat | Riverside |
| Chromosomal number | 2n=240 |
| Description | Vegatative leaves 2.5-11cm long, 1-4cm wide. Sporophylls 6-15cm long, strobiles 1.5-3.5cm long. Terrestrial. Summer green in April to June. |
| Reference | Endangered adder's tongue fern Ophioglossum namegatae M. Nishida et Kurita (Ophioglossaceae) at the Watarase Retarding Basin, Japan. Population density, light and temperature factors affecting its sporophyte growth |
| Note | Native to Japan. Rare species. |
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| June 2006 at Tsukuba Botanical Garden |
June 2006 at Tsukuba Botanical Garden |
June 2006 at Tsukuba Botanical Garden |
