220 SPECIMENS EXAMINED --- BORNEO: R.E. Holttum SFN 25529;
J.M.S. Clemens 33723; J. M.S. Clemens 31797.
26. Diplazium halimunense Praptosuwiryo, sp. Nov. Plate 5.
TYPE: Java: G. Halimun, Cikuda Paeh-Cikaniki, ca. 1300 m, 25 February 2006, T.Ng. Praptosuwiryo 2341 holotype, BO.
Rhizoma breve erectum. Stipites 31-43 cm longae, in sicco stramineus, basi brunneus squamatuss deciduis; squama linearis lanceolatis, ad 7 mm longae,
1 mm latae, margine irregularis dentatus cum filum niger spissescens. Lamina pinnata, oblongus, pinnae laterales ad 3-6-jugatae, pinna terminalis ceteris similis,
rachis non prolifera; pinnae stipitatae ad 6 mm longae vel adnatus, ovate- lanceolate, 15-21 cm longae, 3.5-5.5 cm latae, basi subequaliter cuneate, margine
fere integrae, apicem acuminatus leviter serratus. Venae libere, angulum 60-70° cum costa formantes, furcatis Sori basalis vel medius, 18-45 venulae
occupantes. Indusia brunneus, marginem subintegris, persistens. Rhizome short, erect, scales on younger part. Stipe 31.5-43 cm long,
stramineus when dry, dark brown and fallen scales at base; scales lineary lanceolate, 5-7 mm long, 1 mm broad, margin with thickening black strand,
irregularly toothed. Lamina simply pinnate, oblong in outline, lateral pinnae 3-6 pairs, terminal pinnae conform to lateral ones; pinnae ovate-lanceolate, 15-21 cm
long, 3.5-5.5 cm broad, base cuneate, margin entire, slightly serrate near apex, apex acuminate; rachis non gemmiferae, texture thinly papyraceous, light green
when living. Veins free, veins group forming angle 65-70º, forked near costa, upper branch simple and soriferous, lower branch 2-3 times forked again, outer
basiscopic also soriferous but shorther and asplenoid. Sori linear from near costa or submedial, cover 18 – 45 of their length, basal acroscopic the longer and
diplazioid. Indusia brown, margin subentire, opening when matur. PARATYPE. JAVA, West Java, Bandung, Mt. Patuha, Situ Patengan, ca.
1300-1400 m, 26 Dec. 1997, T.Ng. Praptosuwiryo 749 BO. ANATOMY. Transverse section of stipe near lamina: Vascular bundle
form an interrupted U-shaped with angle about 110º, flat base on both inward and outward directions, end bluntly ridges to form an angle 140º.
221 CHROMOSOMES. 2n = 123 Cytotype: T.Ng. Praptosuwiryo 2341, BO
DISTRIBUTION. Java. ECOLOGY. This species is growing on moist humus-rich soil of shady
places in mountain forest. In the Mt. Halimun, D. halimunense was found growing among D. donianum and D. bantamense. Ca. 1300 m.
SPECIMEN EXAMINED. --- JAVA: T.Ng. Praptosuwiryo 749, 2341. NOTES. D. halimunense may be closely related to D. bantamense, but the
last two species appears to differ from the first species. Diplazium halimunese has irregularly sharp toothed scales with thickening black strands, while the
margin scales of D. bantamense are minutely and regularly toothed; Pinnae of D. halimunense
are cuneate at base with margin entire, while pinnae of D. bantamense
are round at base with subentire or serrate at posterior portion. It also resembles D. donianum, but D. halimunense has erect rhizome, while D.
donianum with creeping rhizome. The two species have similarities in irregular
sharp toothed scales and ovate-lanceolate pinnae. Cytological observation of one individual of D. halimunense TNgP
2341b showed 2n = 123 triploid. Whereas most indivual of D. bantamense from Java are tetraploid and only some individual oktoploid. One collection
number of D. donianum planted in Bogor Botanic Gardens from Sumatra is tetraploid See Chapter 5.
ETYMOLOGY. The specific epithet is formed from name of the locality where this species is found, Mt. Halimun, Halimun National Park, West Java.
27. Diplazium hewittii Copel. C.Chr
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