Diplazium sorzogonense (C. Presl) C. Presl (1836: 114)

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 : 53-56

25. Diplazium sorzogonense (C. Presl) C. Presl (1836: 114) . Fig. 31 .

Asplenium sorzogonense C. Presl (1825: 45) .

Type: PHILLIPINES. Sorsogon, T. Haenke s.n. (lectotype PRC, designated by Holttum (1968), not seen) .

Plants terrestrial. Stems erect, 4–5 cm diameter, densely scaly at apex; scales 12–15 × 2–3 mm, linear with long tail apex, brown to dark brown, margin thick and toothed. Fronds 1.20–1.35 m, unipinnate-bipinnatipid, deep green, papyraceous; petioles 40–45 cm, 5–7 mm diameter, green, dark brown at lower portion, scaly throughout, grooved above. Laminae 80–90 × 35–40 cm, terminal pinna not distinct; rachis grooved above, scaly throughout; lateral pinnae 20–25 pairs, 15–20 × 2–3 cm, linear-oblong in outline, basal one or two pairs more or less reflexed, upper pinnae sessile, lower and middle pinnae shortly stalk, apex acuminate, base truncate or subtruncate, margin deeply lobed; lobes a 8–10 × 4.5–5 mm, to 4/5 way to midrib of pinnae, oblique, narrowly oblong, apex round, margin dentate; veins free, pinnate, veinlets 9–10 pairs, mostly simple. Sori 2–3 mm, elongate along veins, nearly to the margin, not extending to main veins, indisiate; indusia subcrescentic. Spores monolete, 37.5–45.0 × 22.5–25.0 μm, bilateral, concavo-convex to plano-convex, perispore present; ornamentation: prominent wing folds.

Thailand: —PENINSULAR: Chumphon (Khao Tong), Ranong (Kra buri), Surat Thani, Nakhon Si Thammarat (Khao Luang, Khao Nan, Krung Ching waterfalls), Phang Nga (Khao Katha Khwam), Satul (Ban Dan), Yala (Ban Malao, Khao Kalakhiri).

Distribution: — India, Laos, Veitnam, Malaysia Philippines, Singapore and Indonesia.

Ecology: —On rather dry mountain slopes in dense evergreen forests at 600–1,400 m elev.

Specimens Examined:— THAILAND. Chumphun, A.F. G. Kerr 11547 (BK, BM); Phung Nga, A.F. G. Kerr 18476 (BM); ibis., A.F. G. Kerr 18476 (BK); Ranong, Kra buri, D.J. Middleton et al. 1492 (BKF); Satul, Ban Dan, E. Smith 2626A (BM); Nakhorn Si Thammarat, Krung Ching waterfalls, P. Pongkai 30 (BCU); ibis., P. Pongkai 49 (BCU); Nakhon Si Thammarat, Khao Luang, P. Pongkai 119 (BCU); Surat Thani, Sakol 1235 (BK). INDIA. Khasya, W. Griffith s.n. (K). INDONESIA. Sumatra, A.G. de Wilde & B.E.E. de Wilde-Duyfjes 19408 (K); Sarawak, Gunong Mulu National Park, C. Jermy (BM); Sulawesi, D. Darnaedi 1688 (K); Sulawesi, G.J. de Joncheere 1597 (K); Sumatra Mt., H. Wiriadinata 1450 (K); Sumatra, H.N. Ridley s.n. (K); Sumatra, J.A. Lörzing 15934 (K); Sumatra, K. Iwatsuki, G. Murata, J. Dransfield & Saerudin S871 (K); Seram Manusela Nat. ParkSaunulu, Kec. Tehoru, M. Kato, K. Ueda & Z. Fanani C11660 (K); Seram W. Seram, M. Kato, K. Ueda & Z. Fanani C12973 (K). LAOS. Pu Bia, A.F. G. Kerr 21051 (BM). MALAYSIA. Negeri Sembilan Gunong Telapak Burok, A.G. Piggott 1670 (K); Negeri Sembilan Gunong Telapak Burok, A.G. Piggott 1885 (K); Penang, C. Curtis 572 (K); Perak, C.G. Matthew s.n. (K); Perak, Dr. King’s Collector 847 (K); ibis., Dr. King’s Collector 7151 (K); Perak, G.F. Hose 233 (K), Sabah, H.F. Comber 4055 (K); Selangor, H.N. Ridley 13432 (K); Perak, H.N. Ridley 15991 (K); Perak, J. Day s.n. (K); Kedah Gunong Lang, Kiah, SFN 35012 (K), Penang, L. Dalhousie s.n. (K); Pahang, M. Nur 11198 (K); Malacca, M.D. Maingay 1773 (K); Penang, N. Wallich 228 (K); Pahang, R.E. Holttum s.n. (K); Sabah, R.E. Holttum SFN25579 (K); Penang, R.W. Hullet s.n. (K); Penang, S. coll. s.n. (K); Pahang, T. Shimizu, K. Iwatsuki, N. Fukuoka & M. Hutoh M13886 (K); Penang, W. S. C. Pinwill s.n. (K); Penang, W.B. Lorrain 7043 (K); Penang, W.F. Mactier s.n. (K). PAPUA NEW GUINEA. Morobe Dist., B.S. Parris & J.P. Croxall 5975 (K); Koitaki, C.E. Carr 12071 (K); Central Dist., C.E. Carr 12545 (K); Mt. Dayman, W.E. Armit 14 (K). PHILIPPINES. Negros, A.D.E. Elmer 10392 (BM); Mindanao, A.D.E. Elmer 11805 (K); Surigao, C.A. Wenzel 2697 (K); Leyte, H. Cuming 301 (K); Mindanao, L. Co 3181 (K); Panay, Libacao, M. Ramos & G. Edaño 31451 (K). SINGAPORE. Seletar, H.N. Ridley 6557 (K).

Figures

FIGURE 31. Diplazium sorzogonense (C. Presl) C. Presl. A, lamina. B, a part of pinna with sori. C, scale showing entire and black marginal cells. P. Pongkai 49 (BCU).