Family

Dryopteridaceae

Nomenclature

Dryopteris integriloba C.Chr., Bull. Dept. Biol. Sun Yatsen Univ. 6: 5. 1933; Ching, Bull. Fan Mem. Inst. Biol. 8: 479. 1938; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 314, f. 36.2 & 36.3. 1941; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 96. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 354. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 203. 2000. – Dryopteris subtriangularis auct. non (C.Hope) C.Chr.: Holttum, Dansk Bot. Ark. 23: 238. 1965.

Description

Rhizome short, erect, scaly. Stipes dark stramineous, densely scaly; scales nearly black, linear, about 20 by 1.2 mm. Laminae oblong with acuminate apex, bipinnate or tripinnatifid in lower part, about 35 by 25 cm; lower 5–6 pairs of lateral pinnae similar to each other in size, oblong-lanceolate with caudate-acuminate apex and broadly cuneate base, 10–13 by 5 cm, with stalks 3–10 mm long; upper pinnae rather suddenly becoming smaller, sessile to adnate at base, pinnatifid to subentire; pinna-rachis densely covered with bullate scales brown with dark brown tails; pinnules patent or slightly ascending, oblong-subdeltoid, round to moderately acute at apex, cordate and shortly stalked or broadly cuneate and sessile or adnate in smaller ones, slightly auricled on both bases, pinnatisect at basal part of larger ones, up to 3 by 1 cm, lobes gradually shallower upwards; papyraceous, green. Sori dorsal on veinlets, medial or a little nearer margin, scattered from basal middle portion of frond; indusia round-reniform, about 0.7 mm diam., glabrous .

Distribution in Thailand

NORTHERN: Tak, Phitsanulok; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Trang

Wider Distribution

S China and N Vietnam.

Ecology

On rather dry ground along streams in light shade at about 800–2000 m alt.

Proposed IUCN Conservation Assessment

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