Diplazium taiwanense Tagawa




Diplazium taiwanense Tagawa, Acta Phytotax. Geobot. 5: 259. 1936; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 105. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 462. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 197. 2000. – Type: Tagawa 624, Taiwan ("Formosa"), Prov. Taihoku, Mt. Sitisei, 28 Aug. 1934 (Type in Herb. Kyoto Imp. Univ.). 


Rhizome erect; scales dark brown, up to 15 by 1.2 mm, toothed. Stipes about 50 cm long, scaly below. Laminae subdeltoid, about 60 by 55 cm, bipinnate; lower pinnae oblong with acuminate apex, up to 30 by 15 cm; larger pinnules distinctly stalked, subtriangular, broadly cuneate at base, gradually narrowing towards acute apex, lobed 1/3 way to costule, up to 8 by 1.8 cm; lobes subquadrangular, moderately rounded to obtuse at apex, indistinctly serrate; softly papyraceous; dark green, paler beneath; veins pinnate, veinlets all simple. Sori oblong, usually along middle or posterior portion of veinlets, medial or submarginal.

Distribution in Thailand

CENTRAL: Nakhon Nayok.

Wider Distribution

N Vietnam and Taiwan to SW Japan.


On moist ground along rivers in light shade at about 800 m alt.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is widespread outside of Thailand and not under any known threat.

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