Diplazium cyamudongoense

Description: — Terrestrial fern. Rhizome erect, scaly; scales very large, dark brown, of two types, long filiform, extremely fragile, thus almost all broken, larger scales with broad base, more than 18.38 mm long, at base 1.95 mm, further upwards 0.97 mm, at the tip 0.54 mm wide, smaller scales linear, more than 15.3 mm long, at base 0.74 mm, further upwards 0.38 mm and at tip 0.08 mm wide. Fronds tufted. Stipes light green, at base dark brown, canaliculate, 40 – 47 (– 108) × 0.7 cm, base with scales similar to those from rhizome. Lamina 59 – 69 (– 105) × 47.5 – 64 cm, triangular – ovate, green, shiny on upper surface, 2 – pinnate – pinnatifid to nearly 3 – pinnate. Rachis greenish – brown to middle – brown, with few scales. Pinnae in ca. 15 – 18 pairs, alternate, arranged at an angle of ca. 45 °, (15.3 –) 23.7 – 34 × 14.5 – 17 cm; pinnae rachis light – brown to greenish, base often darker, with few scales, sometimes minutely hairy. Pinnules in 12 – 14 (– 19) pairs in each pinna, opposite, (4.5 –) 5.1 – 6.6 (– 9.2) × 1.6 – 2.3 (– 4.5) cm, oblong – lanceolate. Pinnules 3 rd order in 6 – 10 (– 12) pairs tapering into the caudate apex, opposite, 0.9 – 1.1 × 0.4 – 0.6 cm, decurrent, deeply incised; racheolule mostly winged. Sori elongate, 1.98 – 2.95 × 0.71 – 0.98 mm, in basic pinnule lobes up to 6 sori, in all other sori usually in two rows along midrib, 6 – 8 (11), paraphyses present, 237 – 350 µm long, sometimes with short branches. Indusium elongate, pale, glabrous, same size as sori attached to one side of sorus (asplenioid). Sori 6 – 11 per pinnule. Spores with alate perispore, 42 – 50.5 × 25.7 – 31.46 µm, alae curved and narrow, 4.29 – 7.15 µm high and 1.14 – 1.43 µm wide, the remaining perispore smooth with small folds.