Family

Aspleniaceae

Nomenclature

Hymenasplenium excisum (C.Presl) S.Linds., Thai Forest Bull., Bot. 37: 69. 2009. – Asplenum excisum C.Presl, Epimel. Bot.: 74. 1851 [‘1849’]; Holttum, Rev. Fl. Malaya ed. 1, 2: 439, f. 256. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 20: 28. 1961; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 84. 1967; K.Iwats., Acta Phytotax. Geobot. 27: 49. 1975; Tagawa & K.Iwats., Fl. Thailand 3: 278. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 140. 2000. – Type: Philippines, Cuming 110 (E).

Asplenium unilaterale f. majus C.Chr., Bernice P. Bishop Mus. Bull. 177: 67. 1943. – Asplenium unilaterale var. majus (C.Chr.) Sledge, Bull. Brit. Mus. (Nat. Hist.) Bot. 3: 246. 1965.

Asplenium unilaterale auct. non Lam.: Tardieu & C.Chr., Fl. Indo-Chine 7(2): 224. 1940, p.p.

Description

Similar to Hymenasplenium apogamum (N.Murak. & Hatan.) Nakaike but different from it in: plants 30–40 cm long, 7–18 cm wide; pinnae larger, gradually becoming smaller upwards, the largest ones shortly stalked, a little falcate, up to 9 by 2 cm, acuminate at apex .

Distribution in Thailand

NORTHERN: Chiang Mai, Lampang, Tak, Phitsanulok; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Satun.

Distribution in Laos

Champasak.

Distribution in Cambodia

Unspecified.

Wider Distribution

Tropical Africa, Sri Lanka, S India, Himalaya, throughout Malesia to Polynesia and Hawaii, north to Vietnam, S China, Taiwan and the Ryukus.

Ecology

On wet ground or on wet muddy rocks usually along streams in dense forests at 300–1500 m alt.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 5037, Chiang Mai, Doi Ang Khang (E); Middleton et al. 5352, Satun, Thale Ban National Park (E).

Voucher specimens - Laos

Poilane 28364, Champasak, Pakson (P).