Family

Lindsaeaceae

Nomenclature

Odontosoria chinensis (L.) J.Sm. in Seemann, Bot. Voy. Herald: 430. 1857; C.Chr., Bot. Tidsskr. 32: 345. 1916; Newman et al., Checkl. Vasc. Fl. Lao PDR: 27. 2007. – Trichomanes chinense L., Sp. Pl. 1099. 1753. – Sphenomeris chinensis (L.) Maxon, J. Wash. Acad. Sci. 3: 144. 1913; Kramer, Fl. Males., Ser. II, Pterid. 1: 182, f. 1–3 1971; Kramer, Gard. Bull, Sing: 26: 4. 1972; Tagawa & K.Iwats., Fl. Thailand 3: 147. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 44, 96. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 27. 2007.

Adiantum chusanum L., Sp. Pl. 1095. 1753. – Sphenomeris chusana (L.) Copel., Bernice P. Bishop Mus. Bull. 59: 69. 1929; Holttum, Rev. Fl. Malaya ed. 1, 2: 341. 1955 [‘1954’]; Holttum, Dansk Bot. Art. 20: 25. 1961; Holttum, Dansk Bot. Art. 23: 234. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 75. 1967. – Stenoloma chusanum (L.) Ching, Sinensia 3: 337. 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 130. 1939; Ching, Fl. Reipubl. Popularis Sin. 2: 275. 1959.

Description

Rhizome short creeping, bearing fronds close together, densely scaly; scales dark brown, up to 2 mm long, 2–3 cells broad at base, stiff. Stipes stramineous, brownish in lower part, scaly at base, grooved on abaxial surface of upper part, up to 35 cm long. Laminae oblong to narrower, up to 40 by 15 cm, acuminate at apex, finely divided to quadripinnate; pinnae alternate, subtriangular, attenuately acuminate at apex, cuneate and stalked at base, gradually becoming smaller upwards, tertiary segments cuneate, lobed, subcoriaceous or thinner; veins usually two or three in each ultimate lobe, hardly visible. Sori terminal on a veinlet or uniting the apices of 2–3 veinlets, close to apex of lobes; indusia attached at base and basal part of both sides, nearly as long as laminae, toothed .

Distribution in Thailand

NORTHERN: Chiang Mai, Nan; NORTH-EASTERN: Phetchabun, Loei; SOUTH-WESTERN: Kanchanaburi SOUTH-EASTERN: Trat; PENINSULAR: Surat Thani, Nakhon Si Thammarat, Trang.

Distribution in Laos

Hua Phan, Xieng Khouang.

Wider Distribution

Warmer part of the Old World, Madagascar to Polynesia, north to Japan and Korea.

Ecology

On moist sandy rocks by streams in light shade to deep shade at about 1000–1300 m alt.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Srisanga et al. 780, Nan (E, QBG); Middleton et al. 5171, Loei, Phu Luang (E).