Ferns of Thailand, Laos and Cambodia

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Family

Dennstaedtiaceae

Nomenclature

Microlepia calvescens (Wall. ex Hook.) C.Presl, Epimel. Bot.: 95. 1851 [‘1849’]; Ching, Fl. Reipubl. Popularis Sin. 2: 214, pl. 16, f. 8 & 9. 1959; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 71. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 114, f. 7.3. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 39, 40 & 86. 2000. – Davallia calvescens Wall. ex Hook., Sp. Fil. 1: 172, t. 48B. 1846. – Microlepia marginalis var. calvescens (Wall. ex Hook.) Bedd., Handb. Ferns Brit. India: 64. 1883. – Microlepia marginata var. calvescens (Wall. ex Hook.) C.Chr., Index Filic.: 208. 1905; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 94. 1939.

Microlepia marginata auct. non (Houtt.) C.Chr.: Holttum, Dansk Bot. Ark 23: 233. 1965.

Description

Rhizome long creeping, about 4 mm diam. densely covered with bright blackish-brown hairs of 2 mm or sometimes more. Stipes 2–5 cm apart, stramineous, hairs at base like those on rhizome, minutely pubescent upwards, grooved on upper surface, 50 cm or more long; lamina oblong-lanceolate, acuminate at apex, 50–70 cm long, up to 30 cm wide, pinnate to bipinnatifid; rachis grooved on upper surface, densely pubescent throughout, stramineous or darker beneath; lateral pinnae more than twelve in pairs, the upper ones gradually reducing in size to form an indistinct apical pinna, the larger ones straight, more or less ascending, linear-lanceolate, gradually narrowing towards long caudate-acuminate apex, distinctly stalked, cuneate anteriorly and very narrowly cuneate posteriorly at base, lobed about halfway or almost completely to costa; costa densely pubescent; lobes oblong, oblique, subfalcate, acute at apex, obscurely waved at margin, up to 1.3 cm long, 0.8 cm broad; papyraceous, green, glabrous above, minutely hairy beneath, veins pinnate, main veins usually zigzag. Sori terminal on veinlets, 1–1.5 mm from the margin of lobes; indusia cup-shaped, hairy .

Distribution in Thailand

NORTHERN: Chiang Mai, Chiang Rai, Lampang, Phitsanulok; NORTH-EASTERN: Phetchabun, Loei; SOUTH-WESTERN: Kanchanaburi; PENINSULAR: Phangnga.

Wider Distribution

E Himalaya, Upper Burma, China (Yunnan & Guangxi), Taiwan and Vietnam; also recorded from Java.

Ecology

On rather dry but usually humus-rich slopes in tropical evergreen forest at 750–1200 m alt.

Proposed IUCN Conservation Assessment

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

	Ferns of Thailand, Laos and Cambodia
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Microlepia calvescens (Wall. ex Hook.) C.Presl Warning: count(): Parameter must be an array or an object that implements Countable in C:\Data\serverroots\htdocs\ThaiFerns\factsheets\functions.php on line 17 Family Dennstaedtiaceae Nomenclature Microlepia calvescens (Wall. ex Hook.) C.Presl, Epimel. Bot.: 95. 1851 [‘1849’]; Ching, Fl. Reipubl. Popularis Sin. 2: 214, pl. 16, f. 8 & 9. 1959; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 71. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 114, f. 7.3. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 39, 40 & 86. 2000. – Davallia calvescens Wall. ex Hook., Sp. Fil. 1: 172, t. 48B. 1846. – Microlepia marginalis var. calvescens (Wall. ex Hook.) Bedd., Handb. Ferns Brit. India: 64. 1883. – Microlepia marginata var. calvescens (Wall. ex Hook.) C.Chr., Index Filic.: 208. 1905; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 94. 1939. Microlepia marginata auct. non (Houtt.) C.Chr.: Holttum, Dansk Bot. Ark 23: 233. 1965. Description Rhizome long creeping, about 4 mm diam. densely covered with bright blackish-brown hairs of 2 mm or sometimes more. Stipes 2–5 cm apart, stramineous, hairs at base like those on rhizome, minutely pubescent upwards, grooved on upper surface, 50 cm or more long; lamina oblong-lanceolate, acuminate at apex, 50–70 cm long, up to 30 cm wide, pinnate to bipinnatifid; rachis grooved on upper surface, densely pubescent throughout, stramineous or darker beneath; lateral pinnae more than twelve in pairs, the upper ones gradually reducing in size to form an indistinct apical pinna, the larger ones straight, more or less ascending, linear-lanceolate, gradually narrowing towards long caudate-acuminate apex, distinctly stalked, cuneate anteriorly and very narrowly cuneate posteriorly at base, lobed about halfway or almost completely to costa; costa densely pubescent; lobes oblong, oblique, subfalcate, acute at apex, obscurely waved at margin, up to 1.3 cm long, 0.8 cm broad; papyraceous, green, glabrous above, minutely hairy beneath, veins pinnate, main veins usually zigzag. Sori terminal on veinlets, 1–1.5 mm from the margin of lobes; indusia cup-shaped, hairy . Distribution in Thailand NORTHERN: Chiang Mai, Chiang Rai, Lampang, Phitsanulok; NORTH-EASTERN: Phetchabun, Loei; SOUTH-WESTERN: Kanchanaburi; PENINSULAR: Phangnga. Wider Distribution E Himalaya, Upper Burma, China (Yunnan & Guangxi), Taiwan and Vietnam; also recorded from Java. Ecology On rather dry but usually humus-rich slopes in tropical evergreen forest at 750–1200 m alt. Proposed IUCN Conservation Assessment Least Concern (LC). This species is widespread and not under any known threat. Warning: count(): Parameter must be an array or an object that implements Countable in C:\Data\serverroots\htdocs\ThaiFerns\factsheets\functions.php on line 17
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