Cyclosorus crassifolius (Blume) S.Linds.

Family

Thelypteridaceae

Nomenclature

Cyclosorus crassifolius (Blume) S.Linds., Edinburgh J. Bot. 66: 359. 2009. – Aspidium crassifolium Blume, Enum. Pl. Javae: 158. 1828. – Lastrea crassifolia (Blume) T.Moore, Index Filic.: 89. 1858; Bedd., Handb: 238. 1883. – Thelypteris crassifolia (Blume) Ching, Bull. Fan Mem. Inst. Biol. 6: 285. 1936; Holttum, Rev. Fl. Malaya ed. 1, 2: 246. 1955 [‘1954’]; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 67. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 403, f. 39.10–13. 1988. – Mesophlebion crassifolium (Blume) Holttum, Blumea 19: 30. 1971; 22: 232. 1975; Boonkerd & Pollawatn, Pterid. Thailand: 224. 2000.

Nephrodium motleyanum Hook., Syn. Fil.: 266. 1867. – Mesophlebion motleyanum (Hook.) Holttum in B.K.Nayar & S.Kaur, Companion Handb. Ferns Brit. India: 209. 1975; Holttum, Fl. Males., Ser. II, Pterid. 1: 381. 1982 [‘1981’].

Dryopteris chlamydophora Rosenst., Med. Rijksherb. 31: 5. 1917, nom. nud.; C.Chr., Gard. Bull. Str. Settl. 4: 384. 1929. – Thelypteris chlamydophora (C.Chr.) Ching, Bull. Fan. Mem. Inst. Biol. Bot. 6: 287. 1936. – Mesoneuron chlamydophorum (C.Chr.) Ching, Acta Phytotax. Sin. 8: 325. 1963. – Mesophlebion chlamydophorum (C.Chr.) Holttum, Blumea 22: 321. 1975.

Description

Rhizome short creeping, up to 1 cm diam.; scales linear-lanceolate, up to 8 by 1.5 mm, brown, hairy. Stipes stramineous with dark base, 15–81 cm in soriferous fronds, shorter in sterile ones. Laminae oblong, attenuate at apex, up to 20–70 by up to 30 cm, narrower in soriferous fronds, 6–21 pairs of pinnae; lowest pinnae usually deflexed, lower pinnae distinctly stalked, narrowly oblong with acuminate apex and broadly cuneate base, up to 19.5 by 4 cm in sterile ones, up to 2.5 cm wide in soriferous ones, lobed to 2/3 way towards costa; upper pinnae sessile, smaller, ascending; segments oblong, oblique to falcate, round to obtuse at apex, entire, up to 13 by 7 mm; chartaceous to coriaceous, deep green, verrucose on lower surface; veins pinnate, veinlets simple, basal posterior ones springing directly from costa, running to sinus between segments. Sori medial, 7 mm diam.; indusia persistent, hairy .

Distribution in Thailand

PENINSULAR: Surat Thani, Nakhon Si Thammarat, Trang, Satun, Narathiwat.

Wider Distribution

W Malesia.

Ecology

On humus-rich mountain slopes in dense evergreen forests at about 1400 m alt.

Proposed IUCN Conservation Assessment

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

Notes

This is a particularly variable species .

Voucher specimens - Thailand

Charoephol et al. 4026, Narathiwat, Sungai Padi (K).

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