Family

Pteridaceae, subfamily Pteridoideae

Nomenclature

Pteris tokioi Masam., Trans. Nat. Hist. Soc. Formosa 25: 13. 1935; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 82. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 248, f. 19.2. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 132. 2000.

Pteris excelsa auct. non Gaudich.: Tardieu & C.Chr., Fl. Indo-Chine 7(2): 154. 1940, p.p.

Description

Rhizome short creeping, thick, bearing closely spaced fronds, densely scaly at apex; scales shining-brown, concolorous, linear, up to 8 by 0.7 mm, entire. Stipes shining, deep castaneous to dark purple, 30–80 cm long, sparsely hirsute or glabrescent. Laminae oblong-ovate, bipinnatifid, 40–60 by 30–40 cm; lateral pinnae 4–6 pairs, opposite; oblong-lanceolate, rounded at base, the base with broadly winged stalks, cordately acuminate at apex, up to 25 by 6 cm, basal ones the largest, each bearing a large deeply lobed basal basiscopic branch just like upper lateral pinnae; ultimate segments narrowly oblong, falcate, rounded at apex, serrate at margin, up to 25 by 5–9 mm, papyraceous, dark green; veins forked, the basiscopic branch of basal ones running to sinus between ultimate segments, free except in soral commissure, visible on both surfaces. Sori continuous along margin of segments from base towards apex; indusia pale, thin, entire .

Distribution in Thailand

NORTH-EASTERN: Phetchabun, Loei; SOUTH-EASTERN: Chanthaburi.

Distribution in Laos

Xieng Khouang.

Wider Distribution

Indochina, Taiwan and southern edge of Japan.

Ecology

On humus-rich mountain slopes in lower montane forests at 1200–1500 m alt.

Proposed IUCN Conservation Assessment

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