Cyclosorus lakhimpurensis (Rosenst.) Copel.

Family

Thelypteridaceae

Nomenclature

Cyclosorus lakhimpurensis (Rosenst.) Copel., Gen. Fil. 142. 1947; B.K.Nayar & S.Kaur, Companion Beddome's Handb. Ferns Brit. India 66, 95. 1974. – Dryopteris lakhimpurensis Rosenst., Med. Rijksherb. 31: 7. 1917. – Thelypteris lakhimpurensis (Rosenst.) K.Iwats., Mem. Coll. Sci. Univ. Kyoto B. 31: 194. 1965; Tagawa & K.Iwats., Fl. Thailand 3: 412. 1988. – Pronephrium lakhimpurense (Rosenst.) Holttum, Blumea 20: 110. 1972; Boonkerd & Pollawatn, Pterid. Thailand: 226. 2000.

Dryopteris rubra Ching, Bull. Fan Mem. Inst. Biol. 2: 198, t. 12. 1931. – Abacopteris rubra (Ching) Ching, Bull. Fan Mem. Inst. Biol. 8: 245. 1938; Holttum, Dansk Bot. Ark. 20: 23. 1961. – Cyclosorus rubra (Ching) Tardieu ex Tardieu & C.Chr., Notul. Syst. 7: 76. 1938; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 390. 1941. – Thelypteris rubra (Ching) K.Iwats., J. Jap. Bot. 38: 315. 1963; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 81. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 70. 1967.

Cyclosorus moulmeinensis auct. non (Bedd.) Copel.: Holttum, Dansk Bot. Ark. 23: 233. 1965.

Description

Rhizome creeping, 6–8 mm diam., blackish; scales oblong-ovate with tails, up to 5 by 1.3 mm, brown, hairy. Stipes 43–111 cm long, stramineous with dark scaly base. Laminae oblong, 40–105 by 25–50 cm; lateral pinnae (4–)6–9 pairs, subsessile, ascending, narrowly oblong, cuspidate at apex, rounded to broadly cuneate at base, subentire or irregularly undulate, 16–30 by 3.8–5.5 cm, aerophores present at rachis/costa junction, most conspicuous in crozier, basal pinnae reduced or not; thin, papyraceous to herbaceous, green to dark green, tinted red in dried specimens, glabrous to densely minutely pubescent beneath; venation meniscioid, or excurrent veins interrupted. Sori in two rows usually close to excurrent veinlets, round to oblong, often confluent at maturity, exindusiate; sporangia not setose , sometimes glands on sporangial body.

Distribution in Thailand

NORTHERN: Mae Hong Son, Chiang Mai, Chiang Rai, Tak, Phitsanulok; NORTH-EASTERN: Loei; SOUTH-WESTERN: Kanchanaburi, Phetchaburi.

Wider Distribution

Himalaya to SW China and N Vietnam.

Ecology

On humus-rich slopes usually near streams in 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. 5123, Loei, Phu Suan Sai National Park (E).

Habit

Habit

Habit

Habit

Rhizome

Rhizome

Crozier with prominent pale green aerophores

Crozier with prominent pale green aerophores

Crozier

Crozier

Venation

Venation

Aerophore at junction of rachis and pinna

Aerophore at junction of rachis and pinna

Lower surface of pinna

Lower surface of pinna

Sori

Sori

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