Ferns of Thailand, Laos and Cambodia

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Family

Polypodiaceae

Nomenclature

Lepisorus contortus (Christ) Ching, Bull. Fan Mem. Inst. Biol. 4: 90. 1933; Tagawa & K.Iwats., Fl. Thailand 3: 513, f. 51.3. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 273. 2000. – Polypodium lineare var. contortum Christ, Nuov. Giorn. Bot. Soc. Ital. N.S. 4: 98, pl. 1, f. 3. 1897. – Polypodium contortum Christ, Bot. Gaz. 51: 347. 1911. – Pleopeltis contorta (Christ) Alston & Bonner, Candollea 15: 209. 1956; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 49. 1967.

Description

Rhizome creeping, about 2.5 mm diam., bearing fronds less than 0.5 cm apart, densely scaly throughout; scales dark brown, slightly clathrate, minutely toothed at margin, oblong-subdeltoid, gradually narrowing towards attenuate apex, up to 2 by 0.7 mm. Stipes very short, indistinct. Laminae linear, attenuate towards both ends, in mature large laminae about 15 cm by 0.7 cm, the margin more or less recurved; coriaceous; veins hardly visible, copiously anastomosing. Sori round, medial, oblong. Spores monolete .

Distribution in Thailand

NORTHERN: Chiang Mai.

Wider Distribution

Himalayas, Tibet and China.

Ecology

On mossy tree trunks in dense mountain forests at high altitudes.

Similar species

Lepisorus heterolepis (Rosenst.) Ching, Lepisorus subconfluens Ching.

Proposed IUCN Conservation Assessment

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

Notes

Further taxonomic work is necessary to distinguish Lepisorus contortus (Christ) Ching, Lepisorus heterolepis (Rosenst.) Ching and Lepisorus subconfluens Ching.

	Ferns of Thailand, Laos and Cambodia
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Lepisorus contortus (Christ) Ching 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 Polypodiaceae Nomenclature Lepisorus contortus (Christ) Ching, Bull. Fan Mem. Inst. Biol. 4: 90. 1933; Tagawa & K.Iwats., Fl. Thailand 3: 513, f. 51.3. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 273. 2000. – Polypodium lineare var. contortum Christ, Nuov. Giorn. Bot. Soc. Ital. N.S. 4: 98, pl. 1, f. 3. 1897. – Polypodium contortum Christ, Bot. Gaz. 51: 347. 1911. – Pleopeltis contorta (Christ) Alston & Bonner, Candollea 15: 209. 1956; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 49. 1967. Description Rhizome creeping, about 2.5 mm diam., bearing fronds less than 0.5 cm apart, densely scaly throughout; scales dark brown, slightly clathrate, minutely toothed at margin, oblong-subdeltoid, gradually narrowing towards attenuate apex, up to 2 by 0.7 mm. Stipes very short, indistinct. Laminae linear, attenuate towards both ends, in mature large laminae about 15 cm by 0.7 cm, the margin more or less recurved; coriaceous; veins hardly visible, copiously anastomosing. Sori round, medial, oblong. Spores monolete . Distribution in Thailand NORTHERN: Chiang Mai. Wider Distribution Himalayas, Tibet and China. Ecology On mossy tree trunks in dense mountain forests at high altitudes. Similar species Lepisorus heterolepis (Rosenst.) Ching, Lepisorus subconfluens Ching. Proposed IUCN Conservation Assessment Least Concern (LC). This species is widespread and not under any known threat. Notes Further taxonomic work is necessary to distinguish Lepisorus contortus (Christ) Ching, Lepisorus heterolepis (Rosenst.) Ching and Lepisorus subconfluens Ching. 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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Lepisorus contortus (Christ) Ching