| Family | Polypodiaceae |
| Scientific name | Pyrrosia lingua (Thunberg) Farwell |
| Synonyms | Acrostichum lingua Thunberg; Cyclophorus bodinieri H. Léveillé; Cyclophorus lingua (Thunberg) Desvaux; Cyclophorus lingua (Thunberg) Desvaux var. angustifrons Hayata; Cyclopholus taiwanensis (Christ) C. Christensen; Niphobolus lingua (Thunberg) Sprengel; Nipholus bodmartini Christ; Polycampium lingua (Thunberg) C. Presl; Polypodium lingua (Thunberg) Swartz; Polypodium tiwannensis Christ; Pyrrosia caudifrons Ching; Pyrrosia martini (Christ) Ching; Pyrrosia medogenensis Ching & S. K. Wu; Pyrrosia oblonga Ching |
| Common name | (Japanese common name) hitotsu-ba [one leaf fern] |
| (English common name) felt fern, pyrrosia, Japanese felt fern, Japanese wild tongue staghorn like fern, tongue fern | |
| Distribution | (Japan) Honshu (west of Kanto region), Shikoku, Kyushu, Okinawa |
| (Other nations) Korea, China, Taiwan, Vietnam, Thailand, Myanmar | |
| Chromosomal number | 2n=74 |
| Description | Leaves 7-20cm length. Evergreen. Epiphyte on old trees or lithophyte on stone walls. |
| Reference | Pyrrosia lingua (Thunb.) Farwell |
| Pyrrosia lingua (Thunb.) Farw. |
| August 2007 at Higashiyama Botanical Garden |
August 2007 at Higashiyama Botanical Garden |
August 2007 at Higashiyama Botanical Garden |
| August 2007 at Higashiyama Botanical Garden |