Ferns of Thailand, Laos and Cambodia

Family

Lomariopsidaceae

Nomenclature

Cyclopeltis crenata (Fée) C.Chr., Index Filic. Suppl. 3: 64. 1934; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 334, f. 39,1–2. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 527, f. 309. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 23: 242. 1965; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 56. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 392. 1988; Holttum, Fl. Males., Ser. II, Pterid. 2: 117. 1991; Boonkerd & Pollawatn, Pterid. Thailand: 156, 201. 2000. – Hemicardion crenatum Fée, Mém. Foug., 5. Gen. Filic.: 283, t. 22. A, f. 1. 1852. – Type: Gaudichaud s.n., Tourane (RB; iso K).

Polystichum semicordatum auct. non (Sw.) T.Moore: Bedd., Handb. Ferns Brit. India: 201, f. 101. 1883.

Description

Rhizome short, erect, densely scaly; scales thin, linear, up to 30 by 1.3 mm, dark brown, toothed at margin. Stipes about 25 cm long, densely scaly at base, scales sparse and narrower upwards, stramineous. Laminae oblong-lanceolate, about 60 by 25 cm, gradually narrowing both towards apex and base; rachis densely clad with linear hairs, grooved above; lateral pinnae numerous, more than 30 pairs, sessile, jointed to rachis, lanceolate with caudate apex, broadly cuneate to cordate at base, the basiscopic side above rachis and the acroscopic side below rachis, middle pinnae the largest, up to 13 by 1.8 cm, subentire or serrate at margin; apical pinna larger than the uppermost lateral ones, about 2 cm wide; chartaceous, glabrous; costa raised on both surfaces, hairy beneath, veins forked near base. Fertile pinnae usually narrower. Sori dorsal on terminal veinlets, usually in two or three nearly regular rows on each side of costa; indusia entire, peltate, fugacious .

Distribution in Thailand

NORTHERN: Mae Hong Son; SOUTH-WESTERN: Kanchanaburi, Phetchaburi, Prachuap Khiri Khan; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Chumphon, Surat Thani, Satun, Yala.

Wider Distribution

Burma, S China, Indochina to W Malesia.

Ecology

In evergreen forests at low altitudes.

Proposed IUCN Conservation Assessment

Least Concern (LC). This variety is widespread and not under any known threats.

Voucher specimens - Thailand

Middleton et al. 4718, Chanthaburi, Khao Soi Dao Wildlife Sanctuary (E).

	Ferns of Thailand, Laos and Cambodia
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Cyclopeltis crenata (Fée) C.Chr. Family Lomariopsidaceae Nomenclature Cyclopeltis crenata (Fée) C.Chr., Index Filic. Suppl. 3: 64. 1934; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 334, f. 39,1–2. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 527, f. 309. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 23: 242. 1965; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 56. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 392. 1988; Holttum, Fl. Males., Ser. II, Pterid. 2: 117. 1991; Boonkerd & Pollawatn, Pterid. Thailand: 156, 201. 2000. – Hemicardion crenatum Fée, Mém. Foug., 5. Gen. Filic.: 283, t. 22. A, f. 1. 1852. – Type: Gaudichaud s.n., Tourane (RB; iso K). Polystichum semicordatum auct. non (Sw.) T.Moore: Bedd., Handb. Ferns Brit. India: 201, f. 101. 1883. Description Rhizome short, erect, densely scaly; scales thin, linear, up to 30 by 1.3 mm, dark brown, toothed at margin. Stipes about 25 cm long, densely scaly at base, scales sparse and narrower upwards, stramineous. Laminae oblong-lanceolate, about 60 by 25 cm, gradually narrowing both towards apex and base; rachis densely clad with linear hairs, grooved above; lateral pinnae numerous, more than 30 pairs, sessile, jointed to rachis, lanceolate with caudate apex, broadly cuneate to cordate at base, the basiscopic side above rachis and the acroscopic side below rachis, middle pinnae the largest, up to 13 by 1.8 cm, subentire or serrate at margin; apical pinna larger than the uppermost lateral ones, about 2 cm wide; chartaceous, glabrous; costa raised on both surfaces, hairy beneath, veins forked near base. Fertile pinnae usually narrower. Sori dorsal on terminal veinlets, usually in two or three nearly regular rows on each side of costa; indusia entire, peltate, fugacious . Distribution in Thailand NORTHERN: Mae Hong Son; SOUTH-WESTERN: Kanchanaburi, Phetchaburi, Prachuap Khiri Khan; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Chumphon, Surat Thani, Satun, Yala. Wider Distribution Burma, S China, Indochina to W Malesia. Ecology In evergreen forests at low altitudes. Proposed IUCN Conservation Assessment Least Concern (LC). This variety is widespread and not under any known threats. Voucher specimens - Thailand Middleton et al. 4718, Chanthaburi, Khao Soi Dao Wildlife Sanctuary (E). Habit Habit Habit Habit Pinnae Upper surface of lamina Lower surface of rachis and pinnae Old sori
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Cyclopeltis crenata (Fée) C.Chr.