Vandenboschia birmanica (Bedd.) Ching

Family

Hymenophyllaceae

Nomenclature

Vandenboschia birmanica (Bedd.) Ching in Ching & Wang, Acta Phytotax. Sin. 8: 135. 1959; Ching, Fl. Reipubl. Popularis Sin. 2: 185. 1959; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 44. 1967. – Trichomanes birmanicum Bedd., Suppl. Ferns S. Ind.: 3, pl. 349. 1876; Bedd., Handb. Ferns Brit. India: 43. 1883; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 70. 1939; Tagawa & K.Iwats., Fl. Thailand 3: 84, f. 5.7. 1979. – Crepidomanes birmanicum (Bedd.) K.Iwats., J. Fac. Sci. Univ. Tokyo, Sect. 3, Bot. 13: 530. 1985; Tagawa & K.Iwats., Fl. Thailand 3: 613. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 69. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 27. 2007.

Trichomanes radicans auct. non Sw.: Bedd., Handb. Ferns Brit. India: 43. 1883; Copel., Philipp. J. Sci. 51: 213, pl. 35, f. 1–2. 1933, p.p.; Holttum, Rev. Fl. Malaya ed. 1, 2: 107. 1955 [‘1954’]; Holttum, Dansk Bot. Ark, 20: 18. 1961.

Description

Rhizome long creeping, more than 1 mm diam., densely covered with dark brownish hairs. Stipes more than 1 cm apart, distinctly winged almost to the base, hairy when young, 2.5–5 cm long. Laminae oblong-lanceolate, acute at apex, round to cordate at base, 6–10 cm long, 2–4 cm wide, tripinnatifid; rachis winged throughout, the wings more than 0.5 mm broad on each side, entire and flat; pinnae subdeltoid (larger ones) to ovate (upper ones), moderately acute at apex, broadly cuneate to subtruncate at base, stalks shortly winged, in larger ones about 2 cm long and wide; ultimate segments narrow, about 0.3 mm broad, acute at apex; not so deeply dissected, wings of various axes usually broader than the ultimate lobes; dark green in colour. Sori on short axial segments, usually on basal acroscopic portions of pinnules or on secondary pinnules; involucre tubular with little-dilated mouth and short stalk , about 1.5 mm long, 0.7 mm diam.

Distribution in Thailand

NORTHERN: Mae Hong Son, Chiang Mai, Chiang Rai, Lampang, Phrae; NORTH EASTERN: Loei; SOUTH-WESTERN: Kanchanaburi; SOUTH-EASTERN: Chanthaburi.

Distribution in Laos

Unspecified.

Wider Distribution

Burma, S China, N Indochina and Japan.

Ecology

On wet sandy ground or on moist muddy rocks usually in evergreen forest near streams, rather rare, at medium to high altitudes.

Proposed IUCN Conservation Assessment

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

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