Pteridrys syrmatica (Willd.) C.Chr. & Ching

Family

Tectariaceae

Nomenclature

Pteridrys syrmatica (Willd.) C.Chr. & Ching, Bull. Fan Mem. Inst. Biol. 5 131, pl. 11, 17. 1934; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 302. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 530, f. 311 & 312. 1955 [‘1954’]; Seidenf., Nat. Hist. Bull. Siam Soc. 19: 87. 1958; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 86. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 100. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 388. 1988; Holttum, Fl. Males., Ser. II, Pterid. 2: 5, f. 1. 1991; Boonkerd & Pollawatn, Pterid. Thailand: 210. 2000. – Aspidium syrmaticum Willd., Sp Pl. 5: 237. 1810. – Lastrea syrmatica (Willd.) T.Moore, Index Filic.: 105. 1858; Bedd., Handb. Ferns Brit. India: 243, f. 124. 1883; E.Smith, J. Siam Soc. Nat. Hist. Suppl. 8: 5. 1929. – Type: "Habitat in Peru, Chile" (B, herb Willd. 19765).

Description

Rhizome short, creeping or ascending; scales lanceolate, rounded or cordate at base, tailed at apex, up to 8 by 1.2 mm, dark brown, rather thick hairy at margin. Stipes up to 50 cm long, stramineous to pale castaneous, scaly at base, glabrescent above. Laminae oblong to oblong-lanceolate, pinnate with deeply lobed pinnae, 30–50 by 15–30 cm; rachis glabrescent, pale stramineous to deep brown; lateral pinnae 5–12 pairs, ascending, petioles of basal pinnae 1–1.5 cm long, lanceolate, subtruncate to broadly cuneate at base, up to 20 by 4 cm, deeply lobed to 4/5 way towards costule; lobes oblong, oblique, rounded at apex, serrate at margin, up to 17 by 7 mm; papyraceous, deep green, glabrous; costules pale, glabrous, raised on both surfaces; veins pinnate, the basal basiscopic veinlets springing directly from costa, veinlets forked, acroscopic branches ending midway, basiscopic branches running into the projections at margin, and a branch into sinus-teeth. Sori apical or subapical at acroscopic branches of veinlets, thus medial, round; indusia round to elongate reniform, glabrous .

Distribution in Thailand

NORTHERN: Chiang Mai; SOUTH-WESTERN: Phetchaburi, Prachuap Khiri Khan; PENINSULAR: Surat Thani, Phangnga, Krabi, Nakhon Si Thammarat, Trang, Satun, Yala.

Wider Distribution

Sri Lanka, S Vietnam and Malesia, east to Sulawesi and the Philippines.

Ecology

On humus-rich ground in dense evergreen forests at altitudes lower than 600 m.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4286, Surat Thani, Khao Photha Daeng Lam (E).

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