190
c. var. ridleyi Copel. Praptosuwiryo, stat. nov.
Athyrium ridleyi Copel., Phil. Journ. Sci. XI 1 : 39. 1908. TYPE:
Ridley 13970 Isotype, SING. Stipe deep green when living, bearing densely deep green protuberances,
minutely pilosa. Lateral pinnae up to 7 pairs; larger ones up to 10.8 cm broad, apex caudate, margin entire or crenate. Veinlets very distict, light green. Extra
areola between adjacent normal group of veins copious, the line of series extra areola up to 56 way to costa.
DISTRIBUTION. Malay Peninsula, Suamtra. SPECIMENS EXAMINED: --- MALAY PENINSULA: Ridley 13970. ---
SUMATRA: T.Ng. Praptosuwiryo 2525a.
2. Diplazium acuminatum Blume
Diplazium acuminatum Blume, En. Pl. Jav.: 193. 1828; Alderw., Mal.
Ferns: 409. 1908. Rhizome short, erect-suberect. Stipe 34-36 cm long, 2 mm thick when
dry, brown, black and scales at base, glabrous upward; scales lineary triangular, 5- 10 mm long, 0.5-mm broad, dark brown, margin sharply toothed. Lamina
pinnate, subtriangular- lanceolate in outline, 45-50 cm long, 15-23 cm broad, free pinnae 15-21 pairs below deeply lobed acuminate apex of lamina; lower pinnae
shortly stalked to 6 mm long, upper ones adnate–sessile, lineary subtriangular, larger pinnae 12-12.5 cm long, 2-2.2 cm broad, base unequal, lower base cuneate,
upper truncate, apex acuminate, margin lobed ½-34 way to costa; lobus oblong, basal acroscopic the largest, 3.5-5.5 mm wide, ends truncate, entire or slightly
toothed; texture firm; rachise gemmiferous on upper part; veins free, forming angle about 50-55° to costa, pinnate in the lobes, veinlets 5-7 pairs, all simple,
forming angle about 15-20º to main veins. Sori elongate from near costule covers 13-23 way of their length or almost reaching the margin, basal acroscopic
diplazioid; indusia brown, rolled back, margin entire, firm. DISTRIBUTION. Sumatra.
ECOLOGY. In the mountain forest at 400-1000 m dpl.
191 SPECIMENS EXAMINED: --- SUMATRA: J.A. Lörzing 14051, 6311; J.
Buumee A. 841. NOTES. Kato 1994 states that this species is similar and perhaps related
to D. megaphyllum Baker Chist from E. Myamma, SW China, Taiwan, Vietnam and Thailand, in general habit and leaf morphology, but from it in the regularly
anastomosing veins. D. megaphyllum generally has free veins.
3. Diplazium aequibasale Baker C.Chr
. Diplazium aequibasale
Baker C.Chr.; Ind. 227. 1905; Alderw., Mal. Ferns: 404. 1908. J. Fac. Sci. Univ. Tokyo 3 15: 101. 1991.
Rhizome short, erect. Stipe 21-28 cm long, pale brown when dry, black and scales at base; scales ovate-lanceolate, 3-5 mm long, 1-1.5 mm broad, fragile,
margin entire. Lamina simply pinnate, lateral pinnae 3-4 pairs, terminal pinnae like the laterals, the largest; lower pinnae shortly stalked to 3-4.5 mm long, upper
adnate, lanceolate, to 14 cm long, 2.5 cm broad, base cuneate, margin entire or crenate near apex, suddently narrowed near apex, acuminate; texture rather thin,
surface naked; costa rounded beneath, grooved on upper surface; veins group forming angle about 65-70° to costa, each group of 3 veins, middle vein forked 1-
3 times, occasionally the outer of vein group uniting with the inner close to the margin. Sori bearing at 1-3 veins in each vein group, those on the outer vein of
the group extending from the costa to margin, rest shorter, acroscopic outer veins usually diplazioid; indusia brown, narrow, margin entire, persistent, fragile,
opening when mature. CHROMOSOMES. 2n = 164 Cytotype: T.Ng. Praptosuwiryo 2026, BO
DISTRIBUTION. Java, Sumatra, Malay Peninsula, Borneo. ECOLOGY. It is rheophytic species and usually grown at lowland clay
stream-bank. 20- 400 m. SPECIMENS EXAMINED. --- JAVA: Scheffer 16584
.
--- BORNEO: A. Kostermans 10448, T.Ng. Praptosuwiryo 2148. --- SUMATRA: O.
Posthumus 695; T.Ng. Praptosuwiryo 2026a, 2026b, 2157. --- MALAY PENINSULA: R.E. Holttum SFN 24780.
192
4. Diplazium albido-squamatum Alderw.
Kategori