Asplenium mixtum Roxburgh (1844: 499) Revision of the fern genus Diplazium (Polypodiales: Athyriaceae) in Thailand Pongkai, Puttamon Zhang, Li-Bing Boonkerd, Thaweesakdi Pollawatn, Rossarin Phytotaxa 2023 2023-12-22 631 1 1 69 36HR4 (Roxb.) C. V. Morton (1974: 294) C. V. Morton. A 294 1974 Roxb. [178,769,1454,1481] Polypodiopsida Athyriaceae Diplazium Plantae Polypodiales 31 32 Tracheophyta species mixtum    Asplenium mixtumRoxburgh (1844: 499).    TYPE: INDONESIA. Ambon?, anon. s.n. ( C. Smith?) ( lectotype BR[ BR0000006989866], designated by Morton (1974)).   Asplenium prescottianum Wallich ex Hooker (1860: 251).  Diplazium prescottianum(Wall. ex Hook.) T. Moore (1859: 334). Type: SINGAPORE. 1922,  Wallich, 235( lectotypeK-W [ K001109599], designated by Morton (1974); isolectotypes K000443459!, K000443460!). Plants terrestrial. Stems erect, 5–6 cmdiameter, bearing thick black roots, apex scaly; scales about 15 × 1 mm, narrowly lanceolate, concolorous, dark brown, margin entire. Fronds up to 1.30 m, imparipinnate; petioles 60–80 cm, 5–6 mmdiameter, glabrous, green with dark brownish base. Laminae 43–50 × 18–25 cm, outline oblong, suddenly becoming smaller upword, long acuminate apex, terminal pinna not distinct, glabrous, papyraceous, deep green; lateral pinnae 11–12 pairs, alternate, 13–17 × 1.7–2.0 cm, bolong, falcate, apex caudate-attenuate, base obtuse, margin crenate, moderately auricle at acroscopic base; aucicle, apex round to obtuse, margin subentire, stalked; stalk 2.0– 2.5cm, longest at lower pinnae; veins pinnate, veinlets 3–4 pairs. Sori 0.5–1.0 cm, elongate along veinlets, diplazoid, indusiate; indusia thin, firm, persistance. Spores monolete, 40.5–43.0 × 23.5–25.5 μm, bilateral, concavo-convex to plano-convex, perispore present; ornamentation: labryrinth.   FIGURE 16.  Diplazium mettenianum(Miq.) C.Chr. A ,lamina. B,a part of pinna with sori. C,scale showing entire and not black marginal cells. P. Pongkai 20 (BCU).   FIGURE 17.  Diplazium mixtum(Roxb.) C.V. Morton. A ,frond. B,a part of pinna with sori. C,scale showing entire and not black marginal cells. J. Sinclair 9376(SING).    Thailand:—SOUTH-EASTERN: Trat(Ko Chang); PENINSULAR: Nakhon Si Thamarat (Khao Luang), Yala (Ban Chana, Ban Malao).   Distribution:— Malaysia, Singapore. Ecology:— Onhumus-rich mountain slopes in dense evergreen forests at medium elevations.  Specimens Examined:— THAILAND. Prachinburi, Khao Yai,  K. larsen, T. Smitinand & E. Warncke312( BKF);  MALAYSIA. Perak, Anonymous s.n.( K).  SINGAPORE. Crangie,  H. J. Murton 100( K); Tanjong Gul,  J. Sinclair 9376( K); no locality,  N. Wallich 235( K); ibis.,  T. Lobb 32( K). 4502099321 [142,1314,1566,1588] TYPE, C, BR Indonesia Ambon 31 32 BR0000006989866 1 lectotype 4502099356 [394,712,1602,1624] K Singapore Type Wallich 31 32 K001109599, K000443459, K000443460 2 lectotype 4502099322 [189,775,158,185] Thailand Trat 34 35 1 Trat 4502099352 BKF Thailand Distribution On Malaysia 34 35 1 Prachin Buri