Pteris blumeana J.Agardh
Pteridaceae, subfamily Pteridoideae
Pteris blumeana J.Agardh, Recens. Spec. Pter.: 22. 1839; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 157. 1940; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 81. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 244. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 127. 2000. – Pteris quadriaurita var. blumeana (J.Agardh) Bedd., Handb. Ferns Brit. India: 112. 1883; Hosseus, Beih. Bot. Centralbl. 28(2): 366. 1911.
Pteris quadriaurita auct. non Retz.: Christ, Bot. Tidsskr. 24: 106. 1901; C.Chr., Bot. Tidsskr. 32: 348. 1916.
Rhizome short, erect, densely scaly at apex; scales linear, up to 8 by 0.8 mm, dark brown with pale ferrugineous margin. Stipes castaneous to purplish in lower part, stramineous or pale brown upwards, puberulous or glabrescent, up to 85 cm long. Laminae oblong with acute apex, deeply bipinnatisect to bipinnate, 40–70 by 35–50 cm; lateral pinnae 2–12 pairs, slightly ascending, nearly straight, lanceolate with truncate base, caudately acuminate at apex, up to 28 by 3–5.5(–6.5) cm, basal pinnae bearing large basiscopic pinnules; rachis and costa grooved on upper surface, more or less hirsute; pinnules patent, straight or slightly falcate, narrowly oblong, rounded to obtuse or rarely moderately acute at apex, up to 36 by 2.5–4.5 mm, entire at margin, adnate and decurrent to the next ones by wings of costa less than 0.5 mm broad; with long spines on upper surface of costa and costules, upper surface of lamina sparsely pubescent, green, papyraceous; veins forked, distinct on both surfaces. Sori continuous along margin of pinnules except at apex and sinus; indusia pale, thin, transparent .
Distribution in Thailand
NORTHERN: Chiang Mai, Chiang Rai, Lampang, Phitsanulok; NORTH-EASTERN: Loei; EASTERN: Nakhon Ratchasima; SOUTH-WESTERN: Kanchanaburi; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Chanthaburi, Trat; PENINSULAR: Chumphon, Yala.
Distribution in Laos
Distribution in Cambodia
India, Laos, Cambodia, S Vietnam and Malesia.
On usually dry mountain slopes in deep shade or on humus-rich ground in not very dense forests at low or medium altitudes (but to 1200 m alt. on Phu Luang).
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is common and widespread and not under any known threat.
Voucher specimens - Thailand
Middleton et al. 4758 & 4760, Kanchanaburi, Khao Laem National Park, Kra Teng Jeng Waterfall (E).
Voucher specimens - Laos
Harmand 1253, Attapeu (P); Delacour s.n., Khammouane, Nape (P).
Voucher specimens - Cambodia
Pierre 5787, Kampot, Kamchay (P).
Habit, form with white stripe
Rhizome and crozier
Frond, form with white stripe
Frond, form without white stripe
Pinnae from beneath.
Pinnae from above (white stripe form)
Spine-like hairs on upper frond surface
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