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

227

32. Diplazium latisquamatum Holttum

Diplazium latisquamatum Holttum, Gard. Bull. S.S. 9 : 124. 1937. Fig. 3. Gard. Bull. S.S. 11: 90. 1940. Fig. 3; --- TYPE: R.E. Holttum SFN 31311 holotype, SING, S. Terla, Ulu Telom, Pahang, Malay Peninsula. –Athyrium latisquamatum Holtt. Holttum, Rev. Fl. Malaya 2: 563. f. 334. 1966. Rhizome short, erect. Stipe 52-100 cm long, 5-9 mm thick, dark brown, nearly black at base, scales throughout, more dense at base; scales rounded-ovate, dark brown, center thicker, margin entire, 4-8 mm long, 2.5-4 mm broad, thickening black strand irregularly near apex. Lamina bipinnate-tripinnatifid, 50- 125 cm long, about 40-80 cm wide; pinnae stalked 2.5-5.5 cm long, lanceolate, larger pinnae 26-54 cm long, 15-18 cm wide, pinnulae 10-13 pairs below pinnnatifid apex of pinnae, basal pinnules a little reduce, smaller on acroscopic than on basiscopic side; pinnulae sessile on upper ones, shortly staked on lower ones, the larger 6.5-11 cm long, 1.8-3 cm wide, base broadly cuneate to subtruncate, gradually narrowed to acuminate apex, margin lobed to within 1.5-2 mm of the costa 34 way to costa, lobes slightly oblique, 2.5-6 mm wide, commonly 5 mm wide, apex truncate, margin entire or toothed near apex; texture thin, firm; rachis occasionally gemmiferous at the adjacent to the costae at the apex of lamina, glabrous; costae bearing scattered small rounded-ovate scales beneath; veins pinnate in lobes, veinlets 5-7 pairs, simple or forked. Sori covering ¼-12 way of veinlet, acroscopic basal veinlets usually diplazioid. Indusia thin, brown, broad, torn from margin to the base when opening, persistent. DISTRIBUTION. Malay Peninsula, Java, Borneo. ECOLOGY. In moist shady valley of montane forest. These plants often grow in very wet ground. Elevation: 1200-2700 m. SPECIMENS EXAMINED --- JAVA: Matthew 609; Meijer 1453, 1818; Popta 203; Raciborski 108. --- MALAY PENINSULA: R.E. Holttum SFN 31311 holotype, SING. --- BORNEO: J. M.S. Clemens 27122, 27951, 28391, 29716, 32516, 32952. 228

33. Diplazium lobbianum Moore