Pyrrosia mannii (Giesenh.) Ching

Family

Polypodiaceae

Nomenclature

Pyrrosia mannii (Giesenh.) Ching, Bull. Chin. Bot. Soc. 1: 55. 1935; Holttum, Dansk Bot. Ark. 20: 19. 1961; Hovenkamp, Leiden Bot. Ser. 9: 212, f. 18. 1986; Tagawa & K.Iwats., Fl. Thailand 3: 502, f. 50.7–8. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 287. 2000. – Niphobolus mannii Giesenh., Nipholobus: 107. 1901.

Description

Rhizome short creeping, bearing fronds close together, about 3.5 mm diam., densely scaly throughout; scales linear-lanceolate, 4–7 by up to 0.7 mm, brown, concolorous, entire, bearing no hairs. Fronds simple. Stipes indistinct with wings decurrent from laminae. Laminae linear-lanceolate, gradually narrowing towards both apex and base, attenuately acuminate at apex, broadest at middle or in upper 1/3, up to 12 by 0.8 cm; midrib distinct on both surfaces, usually covered with stellate hairs; thick fleshy, veins invisible, anastomosing, upper surface stellate hairy, lower surface densely covered with two kinds of hairs. Sori scattered on the whole under surface except the lower portion, nearly embedded in thick layer of hairs.

Distribution in Thailand

NORTHERN: Chiang Mai, Tak; NORTH-EASTERN: Loei; SOUTH-WESTERN: Kanchanaburi.

Wider Distribution

Himalayas, SW China (Yunnan), and Burma.

Ecology

Rather rare in Thailand, collected on trees or on rocks in evergreen forests at 1300-1600 m alt.

Proposed IUCN Conservation Assessment

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

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