Pteridrys australis Ching

Family

Tectariaceae

Nomenclature

Pteridrys australis Ching, Bull. Fan Mem. Inst. Biol. 5: 142, pl. 15, 16, 19(12–13). 1934; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 306. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 532, f. 313. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 20: 31. 1961; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 100. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 390. 1988; Holttum, Fl. Males., Ser. II, Pterid. 2: 7. 1991; Boonkerd & Pollawatn, Pterid. Thailand: 162, 209. 2000. – Type: S.P.Ko 50556, China, Kwangtung Province (PE).

Description

Rhizome short creeping, rather thick, scaly near apex; scales lanceolate, tailed at apex, up to 12 by 1.3 mm, dark-brown, stiff. Stipes stramineous or darker, scaly at base, glabrescent above, 30–50 cm long. Laminae oblong, hardly or a little narrowing at base, pinnate with very deeply lobed pinnae; up to 75 by 40 cm; rachis like the upper part of stipe, hairy throughout; pinnae 20 or more pairs, lanceolate, caudate at apex, broadly cuneate to subtruncate at base, sessile or very shortly stalked, deeply lobed to 3/4 way towards costa, up to 25 by 4 cm; costa and costule raised on both surfaces, hairy beneath; segments oblong to oblong-lanceolate, oblique to falcate, moderately acute at apex, serrate at margin; veins once or twice forked, the basal ones springing from the base of costule; the basal acroscopic branches soriferous, ending at various positions between costule and margin, glabrous. Sori round, a row in medial position at each side of costule; indusia round to elongate reniform, hairy .

Distribution in Thailand

NORTHERN: Chiang Mai, Lampang; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Ranong, Phangnga, Nakhon Si Thammarat, Yala.

Distribution in Laos

Sayabouly, Vientiane.

Wider Distribution

S China, Burma, N Vietnam and W Malaysia.

Ecology

On mountain slopes in dense forests at medium altitudes.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4686, Chanthaburi, Khlong Khrue Wai Wildlife Sanctuary (E).

Voucher specimens - Laos

Maxwell 99-220, Vientiane (CMU)

Habit

Habit

Habit

Habit

Cross section through rhizome

Cross section through rhizome

Crozier

Crozier

Pinnae

Pinnae

Upper surface of lamina

Upper surface of lamina

Teeth in sinuses on upper frond surface

Teeth in sinuses on upper frond surface

Venation

Venation

Lower surface of rachis and lamina

Lower surface of rachis and lamina

Sori

Sori

Sori

Sori

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