Diplazium xiphophyllum (Baker) C. Christensen (1906: 241)

Pongkai, Puttamon, Zhang, Li-Bing, Boonkerd, Thaweesakdi & Pollawatn, Rossarin, 2023, Revision of the fern genus Diplazium (Polypodiales: Athyriaceae) in Thailand, Phytotaxa 631 (1), pp. 1-69 : 66

31. Diplazium xiphophyllum (Baker) C. Christensen (1906: 241) . Fig. 38 .

Athyrium xiphophyllum Baker (1879: 40) .

Type: MALAYSIA. Veitch, s.n. (holotype K000491792 !; isotype K000491791 !) .

Plants terrestrial. Stems erect, 4–5 cm diameter, clothed with scales at apex; scales 10–15 × 1.5–2.0 mm, linear with long tail apex, concolorous, brown, margin entire. Fronds up to 1.4 m, pinnate; petioles up to 80 cm, 5–6 mm diameter, glabrous, light green, dark brown and scaly near base. Laminae 50–60 × 40–50 cm, oblong in outline, glabrous, subcoriaceous, light green; terminal pinna distinct like lateral one, 15–20 × 3–4 cm, oblong, apex attenuate, base cuneate, margin subentire or lobed; lateral pinnae 4–7 pairs, alternate, 25–30 × 4–5 cm, oblong, apex attenuate, base cuneate, margin subentire, stalked; stalks 2–3 mm; veins pinnate, veinlets 2 pairs, free, occasionally anastomosing but never copiously; gemmae sometimes present on rachis. Sori 2.0– 2.5 cm, elongate along veinlets, usually longest on basal veinlets of vein group, diplazoid; indusia thin, persistance. Spores monolete, 32.5–40.0 × 25.5–27.0 μm, bilateral, concavo-convex to plano-convex, perispore present; ornamentation: prominent wing folds.

Thailand: —PENINSULAR: Nakhon Si Thammarat (Groong Ching waterfalls, Khao Luang, Khao Nan), Narathiwat (Ban Waeng), Yala (Ban Chana) .

Distribution: — Malaysia, Philippines, Brunei and Indonesia.

Ecology: —On moist mountain slopes in shady dense evergreen forests at medium elevations.

Specimens Examined:— THAILAND. Nakhon Si Thammarat, Khao Luang, M. Tagawa , K. Iwatsuki & N. Fukuoka T5304 (L); Nakhon Si Thammarat, Khao Luang, P. Pongkai 113 (BCU); Nakhon Si Thammarat, Krungm Ching waterfalls, P. Pongkai 143 (BCU); Nakhon Si Thammarat, Khao Nan, T. Boonkerd, S. Chantanaorapint & W. Khwaiphan 62 (BCU); Nakhon Si Thammarat, Khao Nan, T. Boonkerd, Y. Sirichamorn & C. Sanguansab 241 (BCU). BRUNEI. Temburong, A.D. Poulsen 114 (K). INDONESIA. Sumatra, E. Gardette 359 (K); Borneo, F.W. Burbidge s.n. (K); ibis., Veitch s.n. (K). MALAYSIA. Pahang, A,G. Piggott 2915 (K); ibis., A,G. Piggott 2956 (K); ibis., A,G. Piggott 2963 (K); ibis., A,G. Piggott 3000 (K); Selangor, A,G. Piggott 3139 (K); Pahang, A.G. Piggott 2963 (K); Selangor, A.G. Piggott 3139 (K); Perak, B. Molesworth-Allen 2732 (K); ibis., B. Molesworth-Allen 2858 (K); Pahang, B.S. Parris & P.J. Edwards 10403 (K); Sabah, B.S. Parris 10720 (K); Perak, C. Curtis 1361 (K); Sabah, C.B. Kloss SFN19028 (K); Perak, C.G. Matthew s.n. (K); Perak, G.F. Hose 285 (K); Selangor, H.N. Ridley 7833 (K); Sabah, J. Clemens & M.S. Clemens 29406 (K); ibis., J. Clemens & M.S. Clemens 29438 (K); Sabah, J. Low s.n. (K); Kalimantan, K. Iwatsuki, M. Kato, G. Murata & Y.P. Mogea B1910 (K); Kinabalu, M.S. Clemens 29438 (BM); Sabah, R.E. Holttum SFN25258 (K); Selangor, R.E. Holttum SFN37357 (K); Perak, W. Robinson 39 (K); Sabah, W.L. Chew, E.J.H. Corner & A. Stainton 1438 (K). PHILIPPINES. Mindanao, A.D.E. Elmer 11319 (K); ibis., A.D.E. Elmer 11745 (K); Paragua, E.D. Merrill 746 (K); Leyte, H. Cuming 305 (K).

Figures

FIGURE 38. Diplazium xiphophyllum (Baker) C. Chr. A, lamina. B, a part of pinna with sori. C, scale showing entire and not black marginal cells. T. Boonkerd et al. 62 (BCU).