Diplazium megasimplicifolium Praptosuwiryo, sp. nov. Plate 8.

236 main vein. It is grows on moist humus-rich soil in shady forest in southern slope of Mt. Salak West Java. ECOLOGY. The species epithet is from the Latin mega and segmentum meaning the large segment in illustrating the large size of its large lobed segments.

38. Diplazium megasimplicifolium Praptosuwiryo, sp. nov. Plate 8.

TYPE: Borneo: Bukit Raya, Tumbang Tubus, Veldkamp 7998, 150 m, 5 May 1983 holotype, BO. Rhizoma breve erectum, gracilis. Stipites ad 15 cm longae, in sicco brunneus dilutus, glabratus, basi deciduis squamatus; squamis ?. Lamina simpliter, ellipticus, ad 40 cm longae, 7.5 – 10.6 cm latae, angustatus versus apicem acuminatus, gradatin decrescens versus basin qui subito contractus e latitude 1 cm vel minus, basi cuneatus, margine integrae; subcartaceus; rhachides prominens; venae in parvus caterva in angulum 65-70º cum costa formantes, ad 5-7 mm seorsum, copiosus anastomantes e margine 23-45 versus costae. Sori in venae lateralis elongate, venae interiora et venae exteriora areolae c.1.5 mm latis formantes, ramis basalis acrocopicus et venulae anastomosis diplazioideus. Indusiis dilutis brunneis, integris, persistens. Rhizome short, erect, slender. Stipe 14-15 cm long, pale brown, glabrous, fallen scales at base. Scales on stipes ?. Lamina simple, elliptical, to about 40 cm long, 7.5 – 10.6 cm wide, narrowed toward acuminate apex, narrowed gradually to the base which is suddenly contracted from a wide of 1 cm or less, base subequally cuneate, margin entire. Texture thin, subcartaceous pale green on upper surface when dry, paler beneath. Rachis distinct on both surface; veins in small group at an angle about 65-70º to the costa, the group about 5-7 mm apart, each vein group forked at the costa, lower branch forked 5-7 times, lateral members of the vein group copiously anastomousing 23-45 way from margin to costa. Sori elongate along lateral veins, both outer and inner vein group forming areoles about 1.5 mm wide, basal acroscopic branch and also those anastomousing veinlets diplazioid. Indusia thin, pale brown, margin entire, persistent. DISTRIBUTION. Borneo. 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.