Diplazium subserratum (Blume) T. Moore (1862: 338)

Pongkai, Puttamon, Zhang, Li-Bing, Boonkerd, Thaweesakdi & Pollawatn, Rossarin, 2023, Revision of the fern genus Diplazium (Polypodiales: Athyriaceae) in Thailand, Phytotaxa 631 (1), pp. 1-69 : 58

27. Diplazium subserratum (Blume) T. Moore (1862: 338) . Fig. 33 .

Asplenium subserratum Blume (1828: 174) .

Type: INDONESIA. Java, Blume s.n. (holotype L0051577 !) .

Plants terrestrial. Stems short, ascending to erect, 2–6 mm diameter, bearing a tuft of fronds and wiry roots, apex scaly; scales 1.0–1.2 × 0.3–0.5 cm, ovate, subtriangular, concolorous, dark brown to black, margin irregulary toothed. Fronds 50–65 cm, simple; petioles slender, 10–15 cm, 3–4 mm diameter, glabrous, dark brown at base. Laminae 40–50 × 3–4 cm, narrowly oblong, gradually narrowing towards at both ends, apex acuminate, base attenuate, margin subentire or irregulary undulate, upper edges serrate, lower edges dentate, glabrous, papyraceous, deep green; veins free, simple or once forked, extending to margin. Sori 8–12 mm, elongate along veins, close to midrib, usually on acroscopic veinlets of vein group. Spores monolete, 55.5–62.0 × 37.5–44.5 μm, bilateral, concavo-convex to plano-convex, perispore present; ornamentation: rough.

Thailand: —PENINSULAR: Narathiwat (Hala-Bala), Satun (Khao Khieo range), Yala (Ban Phu Khao Thong, Betong).

Distribution: — Malaysia and Indonesia.

Ecology: —On moist mountain slope by streams in evergreen forest at about 700 m elev.

Specimens Examined:— THAILAND. Satun, A.F. G. Kerr 14541 (BK); Narathiwat, hala-bala, T. Boonkerd & R. Pollawatn 287 (BCU); Yala, Ban Phu Khao Thong, T. Boonkerd 1176 (BCU). INDONESIA. Java, C. Curtis 10 (K); Sumatra, E. Gardette 315 (K); ibis., E. Gardette 540 (K); Sumatra, H. Wiriadinata 1449 (K); Java, H. Zollinger 3092 (K); Sumatra, J.A. Lörzing 14148 (K); Sumatra, K. Iwatsuki, G. Murata, J. Dransfield & Saerudin S844 (K); Java, M. Fleisher s.n. (K); Kalimantan, M. Kato, G. Murata & Y.P. Mogea B3804 (K); ibis., M. Kato, G. Murata & Y.P. Mogea B3506 (K); Java, M. Raciborski s.n. (K); Java, T. Lobb s.n. (K); Sumatra, W. Hancock 78 (K). MALAYSIA. Negri Sembilan Gunong Telapak Burok, A.G. Piggott 1633 (K); Perak, B. Scortechini s.n. (K); Penang, C. Curtis 570 (K); Perak, C.G. Matthew s.n. (K); Sabah, C.V. Creagh s.n. (K); Perak, Dr. King’s Collector 2156 (K); ibis., Dr. King’s Collector 7121 (K); Pahang, E. Smith 865 (K) Perak, F.E.W. Venning MA68 (K); Perak, G.F. Hose s.n. (K); Pahang, G.H. Addison 37182 (K); ibis., G.H. Addison SFN37182 (K); Pahang, H.N. Ridley 13974 (K); Perak, H.N. Ridley 14225 (K), Sarawak, J. Clemens & M.S. Clemens 20406 (K); Pahang, R.E. Holttum 11474 (K); Penang, W.F. Mactier s.n. (K).

Figures

FIGURE 33. Diplazium subserratum (Blume) T. Moore.A, whole plant. B, a part of lamina with sori.C, scale showing irregulary toothed and not black marginal cells. T. Boonkerd & R. Pollawatn 281 (BCU).