Microlepia trapeziformis (Roxb.) Kuhn

Family

Dennstaedtiaceae

Nomenclature

Microlepia trapeziformis (Roxb.) Kunh, Chaetopterides: 347. 1882; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 96. 1939; Holttum, Rev. Fl. Malaya ed. 1, 2: 313, f. 181. 1955 [‘1954’]; Sledge, Kew Bull. 11: 526. 1956; Ching, Fl. Reipubl. Popularis Sin. 2: 229. 1959; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 72. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 117, f. 7.5. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 89. 2000. – Davallia trapeziformis Roxb., Calcutta J. Nat. Hist. 4: 516. 1844.

Description

Rhizome creeping, glabrescent or covered with hairs at apex, to 1 cm diam. Stipes stramineous, a little swollen at base, glabrous throughout, 60–80 cm long; lamina oblong with long-acuminate apex, tripinnate-quadripinnatifid, up to 70 cm long, 50 cm wide; rachis like the upper parts of stipes, more or less hairy on underside, glabrous on the grooved upperside; the larger pinnae subdeltoid to oblong-subdeltoid, long acuminate at apex, with stalks more than 1 cm long, up to 30 cm long, 15 cm wide, the upper pinnae gradually reduced in size; costae at angle of 45° to rachis, densely hairy on underside, glabrous on grooved upperside; the larger pinnules oblong-subdeltoid, acuminate at apex, unequally cuneate at base, shortly but distinctly stalked; ultimate segments of larger pinnules oblong, oblique or spathulate, round at apex, unequally cuneate at sessile base, subentire or lobed; veins pinnate, more or less distinct on both surfaces, distinctly strigose-hairy beneath, glabrous on laminar surface, deep green above and green below. Sori between crenae of lobes, slightly intramarginal; indusia cup-shaped, hairy .

Distribution in Thailand

NORTHERN: Mae Hong Son, Chiang Mai, Lampang; SOUTH-WESTERN: Kanchanaburi.

Wider Distribution

Sri Lanka, E Himalaya to SW China, Indochina, southwards to Peninsular Malaysia, Sumatra and Java.

Ecology

On mountain slopes in dense lower montane forest at 1300–2200 m alt.

Proposed IUCN Conservation Assessment

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

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