Diplazium procumbens Holttum Biosystematic Study Of The Fern Genus Diplazium In West Malesia

251 ECOLOGY. On humus-rich mountain slopes in dense forest at 1500 – 2000 m sea level. SPECIMENS EXAMINED. MALAY PENINSULA. Perak: Kinta s.n January 1885, C. Curtis 3369; Larut, C.G. Mathew s.n. 1905. Singapore: Ridley s.n. 1892; J.Sinchlair 9376. Selangor: H.L. Hume 8997; H.L. Hume 9347. NOTES. No. Coll. J. Sinclair 9376 12 March 1958 showed a few differences to the description of Holttum 1940, basal veinlets of some pinnate vein group area sometimes uniting. But J. Sinclair stated in his notes that this specimen matches the type specimen of D. Prescottianum Aspidium Prescottianum Wall.. For clarification, therefore, the type specimen should be seen and compared to the Sinclair’s specimen.

49. Diplazium procumbens Holttum

Diplazium procumbens Holttum, Gard. Bull. S.S. 11: 95. 1940. Fig. 4. -- - TYPE: Malay Peninsula, Pahang, Frasser’s, R.E. Holttum SFN 36503 holotype, SING. Rhizome creeping, 8-13 mm diam. Stipe 30-47 cm long, glabrescent, pale brown, black at base. Lamina deltoid, bipinnate, 41.5 – 73 cm long, ? wide; largest pinnae 25-27 cm long, 12-23 wide; pinnules sessile or the shortly stalked to 2 mm long, larger ones to 7.5 by 2-2.7 cm, base truncate, apex acuminate, margin lobed ¾ way or more to costae; large lobes 6-7 mm wide, oblong, almost at right angle to costae, apex rounded, slightly toothed toward apex; veins 6-7 pairs, all forked in larger lobes, usually simple in smaller ones; costae bearing scattered small narrow brown toothed scales beneath. Sori spreading from cortule 13-12 of the length of the veins; indusia very thin, pale brown. SPORES. Monolete, bilaterally symmetrical made asymmetric by perine, heteropolar; polar outline excluding perine transversely elliptical; equatorial longitudinal view excluding perine plano-convex; equatorial transverse view, proximal face convex, distal face hemispherical; perinate. Size: E: 43.0353.7863.20±4.72, P: 29.5233.2237.31±2.39. Laesura: concealed by perine. Perine: alate under LM, costate under SEM, irregular envelope separated 252 from exine surrounds the spore in irregular, wing like costae, often anastomosing to form a loose reticalution, lacunae shallow irregular polygons 8-22 µm, muri 1.6-6.6 µm, surface of muri and lacunae smooth. CHROMOSOMES. 2n = 123 Cytotype: T.Ng. Praptosuwiryo 1173, BO. ANATOMY. Transverse section of stipe near lamina: Vascular strand form an uninterrupted V-shaped or U-shaped with an angle 100º, end ridge in both inward and outward directions do form an angle 120º. DISTRIBUTION. Malay Peninsula, Sumatra, Java. ECOLOGY. Terrestrial. Rock soil, on open wet ground by stream. SPECIMENS EXAMINED. --- MALAY PENINSULA. Pahang: R.E. Holttum 11478; 3800 ft., R.E. Holttum 21645; R.E. Holttum SFN 36503, C.H. Addison 37201; I.H. Burkill R.E. Holttum 8844; E.J.H. Corner s.n. 12 Agust. 1937; R.E. Holttum 21645. Perak: King 7894. --- JAVA: T.Ng. Praptosuwiryo 1142, 1238, 1455, 1344, 1348, 1388, 1392, 1520, 1522, 1565, 1693, 1699, 1816, 1714, 1715, 1734, 1772, 1795, 1821. --- SUMATRA: T.Ng. Praptosuwiryo ...

50. Diplazium profluens Praptosuwiryo, sp. nov. Plate 11.