Diplazium xiphophyllum (Baker) C.Chr.

Family

Athyriaceae

Nomenclature

Diplazium xiphophyllum (Baker) C.Chr., Index Filic.: 241. 1905; Holttum, Gard. Bull. Straits Sett. 11: 106. 1940; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 102. 1967; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 56. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 454. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 197. 2000. – Athyrium xiphophyllum Baker, J. Bot. 1879: 40; Holttum, Rev. Fl. Malaya ed. 1, 2: 553. 1955 [‘1954’].

Description

Description adapted from Holttum, Rev. Fl. Malaya ed. 1, 2: 553. 1955 [‘1954’].
Stock short, erect. Stipes to 70 cm long, drying pale, clothed at the base with dull brown entire scales to 1.5 cm long and 2 mm or more wide at the base. Laminae simply pinnate; pinnae in adult plants 5–12 pairs, terminal pinna like the rest, texture thin, colour light green when fresh, light brownish when dry; lower pinnae on very short stalks (2 mm long), uppermost slightly adnate to rachis, with buds sometimes in their axils. Largest pinnae to about 35 by 6 cm, elliptical, narrowed gradually to the slightly unequal cuneate base and more abruptly to the acuminate-caudate apex; edges slightly and irregularly toothed throughout; midrib pale, prominent and glabrous beneath, lateral veins in small groups, at 45° to the midrib, commonly of one basal pair and one central vein which is forked, one or both of its branches also forked; veins occasionally anastomosing near margin but never copiously anastomosing, ending distinctly within the margin and not united to it. Sori on basal pair of veins in each group, from near midrib to near margin, on other veins shorter, commonly 3–4 sori on each vein-group, the sorus on the anterior basal vein only diplazioid. Gemmae on rachis rare.

Distribution in Thailand

SOUTH-WESTERN: Phetchaburi; PENINSULAR: Nakhon Si Thammarat, Yala, Narathiwat.

Wider Distribution

Peninsular Malaysia and Borneo.

Ecology

On moist mountain slopes in dense evergreen forests at medium altitudes.

Proposed IUCN Conservation Assessment

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

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