237 ECOLOGY. This species grows terrestrially on lowland mountain forest
at 150 m. Hitherto it has only been found in Bukit Raya. NOTES. This species is very distinct among Malesian Diplazium in
characters combination as follow: Lamina simple elliptical with base subequaly cuneate, veins copiously anastomousing to 45 way of margin to form areoles
about 1.5 mm wide on both ounter and inner veins group. This species similar to simple frond of D. cordifolium in its copiously anasomousing veins so that the
specimen was formerly identified as D. cordifolium by de Joncheere. Unfortunately, scales that is the important characteristic for identifying Diplazium
is fallen, not found on the specimens. ETYMOLOGY. The species epithet is chosen in illustrating the large
simple frond.
39. Diplazium meijerii Praptosuwiryo, sp. nov. Plate 9.
TYPE: Sumatra: Central Sumatra, Payakumbuh, Northern slope of Mt. Sago, 900-1200 m, 21 July 1955, W. Meijer 3772 Holotype, BO.
Rhizome subprocumbent. Stipites ad 62 cm longis, prope basin 4 mm crassi, in sicco dilutus brunneus, basi nigris squamis; squama nitidus nigris,
linearis lanceolatis, ad 9 mm longis 1 mm latis, margine regularis dentatus cum filum niger spissescens, dentatis furcatis. Lamina ad 50 cm longis et latis,
bipinnata deltoideus; pinnae inferiora stipitae ad 6.5 mm latis, ad 9 cm seorsum, ascendens, oblongis subtriangularis, ad 28 cm longis 12 cm latis, punnulae ad 13
jugatae; pinnulae inferiora stipitae at 2 mm longis, superiora adnatae vel sessile, lanceolatis, ad 7.5 cm longis, 2 cm latis, basi truncates, apice acuminatus, margine
23-34 costam lobatae; lobus basalis acroscopicus multus deminutus ad 2 latis, lobi magniora ad 6 mm latae, obiquus, basin latissimus, apice truncates vel to
roundrotundatus, integer; venae liberis, in lobo pinnatus, venulae ad 6-8-jugatae, simplices vel furcatis. Textura tenuis papyraceous. Sori medius in 14-34
longitudine venularum.. Indusiis tenuis, paleis brunneis, persistens, margine laciniatus.
238 Rhizome subcreeping ?, densely scales on younger part. Stipe to 62 cm
long, 4 mm thick, light brown when dry, black and scales at base; scales lineary lanceolate, to ca. 9 mm long, 1 mm broad, black, shiny, margin toothed, with
regularly thickening black strands, teeth forked at tip. Lamina bipinate, deltoid, ca. 50 cm long and broad; lower pinnae stalked to 6.5 cm long, to 9 cm apart,
ascending, oblong subtringular, to 28 cm long, 12 cm broad, pinnulae to 13 pairs; lower pinnulae stalked to 2 mm long, upper adnate to sessile, lanceolate, to 7.5 cm
long, 2 cm broad, base truncate, apex sharply acuminate, margin lobed 23-34 way to costa; basal acroscopic lobes much reduce to 2 mm broad, larger lobes to 6
mm broad, oblique, broadest at base, apex truncate to rounded, entire; rachise not gemmiferouse; veins free, pinnate in the lobes, veinlets 6-7 pairs, commonly 7
pairs, simple or once forked. Texture thinly papyraceous. Sori medial, cover ¼- 34 of veinlets length; indusia thin, pale brown, persistent, margin laciniate.
DISTRIBUTION. Sumatra. ECOLOGY. Terrestrially, in primary forest at 900-1200 m.
NOTES. Diplazium meijeri may closely related to D. latisquamatum. D. meijeri
differs from D. latisquamatum in its black lineary toothed scales with regular thickening black strands; sori medial. D. latisquamatum has dark brown
round-ovate entire scales with irregularly thickening black strand; sori basalis. ETYMOLOGY. This species is named after W. Meijer, the collector of
this species.
40. Diplazium melanolepis Alderw.
