Revision of the fern genus Diplazium (Polypodiales: Athyriaceae) in Thailand Author Pongkai, Puttamon 0000-0003-0273-1889 Office of National Science Research, National Science Museum, Technopolis, Khlong 5, 39 Moo 3, Khlong Luang, Pathum Thani, 12120, Thailand. & Puttamon. p @ nsm. or. th; https: // orcid. org / 0000 - 0003 - 0273 - 1889 uttamon.p@nsm.or.th Author Zhang, Li-Bing 0000-0002-4905-040X Missouri Botanical Garden, P. O. Box 299, St. Louis, Missouri 63166 - 0299, USA and Chengdu Institute of Biology, Chinese Academy of Sciences, P. O. Box 416, Chengdu, Sichuan 610041, China & Libing. Zhang @ mobot. org; https: // orcid. org / 0000 - 0002 - 4905 - 040 X hang@mobot.org Author Boonkerd, Thaweesakdi 0009-0001-5864-7208 Office of National Science Research, National Science Museum, Technopolis, Khlong 5, 39 Moo 3, Khlong Luang, Pathum Thani, 12120, Thailand. & Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. & bthawees @ googlemail. com; https: // orcid. org / 0009 - 0001 - 5864 - 7208 bthawees@googlemail.com Author Pollawatn, Rossarin 0000-0001-6798-7274 Office of National Science Research, National Science Museum, Technopolis, Khlong 5, 39 Moo 3, Khlong Luang, Pathum Thani, 12120, Thailand. & Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. & Office of National Science Research, National Science Museum, Technopolis, Khlong 5, 39 Moo 3, Khlong Luang, Pathum Thani, 12120, Thailand. & Rossarin. p @ chula. ac. th; https: // orcid. org / 0000 - 0001 - 6798 - 7274 * Corresponding authors: Puttamon. p @ nsm. or. th; Libing. Zhang @ mobot. org & Office of National Science Research, National Science Museum, Technopolis, Khlong 5, 39 Moo 3, Khlong Luang, Pathum Thani, 12120, Thailand. ossarin.p@chula.ac.th text Phytotaxa 2023 2023-12-22 631 1 1 69 https://phytotaxa.mapress.com/pt/article/download/phytotaxa.631.1.1/51384 journal article 10.11646/phytotaxa.631.1.1 1179-3163 10422862 19. Diplazium phanerotis Kunze (1846: 443) . Fig. 25 . Type : INDONESIA . Java , H . Zollinger 1491 ( lectotype G00348439 , designated by Morton (1974)) . Asplenium varium Roxburgh (1844: 498) . Diplazium roxburghii T.Moore (1860: 176) , (1862: 337), nom. nov., non Diplazium varium Gaudich. (1828) . – TYPE : Ambon ?, W . Roxburgh ( C . Smith?) 2409 ( lectotype BR [ BR 0000006984236], designated by Morton (1974)) . Plants terrestrial. Stem erect, 1.0– 1.5 cm diameter, bearing wiry roots, scaly; scales 5–6 × 0.8–1.5 mm , narrowly lanceolate, concolorous, dark brown to black, margin irregularly toothed. Fronds 35–53 cm , unipinnate; petioles 15–20 cm , nearly black, scaly at base. Laminae 20–33 × 12–18 cm , usually longer than stipe, subdeltoid in outline, gradually narrowing upwards, apex attenuate, terminal pinna not distinct, widest at base, glabrous, subcoriaceous, dark green; rachis grooved above, minutely hairy, gammae usually confined to apical portion; lateral pinnae 20–25 pairs, alternate, 8–10 × 1.0– 1.2 cm , narrowly oblong, subfalcate, apex acuminate, base truncate, margin dentate to serrate, distinctly auricle at acroscopic bases, sessile or shortly stalked at lower pinnae, 2–3 mm , longest at lower pinnae; veins pinnate with simple veinlets, veinlets 1 pair. Sori 5–6 mm , elongate along veinlets, usually on acroscopic veinlets of vein group, indusiate; indusia linear, thin, firm, persistent. Spores monolete, 35–37.5 × 20–22.5 μm, bilateral, concavo-convex to plano-convex, perispore present; ornamentation: irregular. FIGURE 23. Diplazium petrii Tardieu. A , whole plant. B, a part of pinna with sori. C, scale showing toothed and not black marginal cells. P. Pongkai 68 (BCU). FIGURE 24. Diplazium petrii Tardieu. Lectotype of D. petrii Tardieu ( Pételot 3589 , P01449476). FIGURE 25. Diplazium phanerotis Kunze. A , whole plant. B, pinna with sori. C, scale showing toothed and not black marginal cells. P. Pongkai 27 (BCU). Thailand :—SOUTH-WESTERN: Prachuap Khiri Khan ( Huaiyang waterfalls); SOUTH-EASTERN: Chanthaburi ; PENINSULAR: Surat Thani ( Ban Don , Klong Ton ), Phangnga ( Toong Rha Suung ), Krabi ( Khao Ngorn Nark ), Nakhon Si Thammarat ( Khao Luang , Khao Huai Pampun , Khao Nan , Chawang ), Patthalung ( Tha Mot ), Trang ( KHAO Chong), Satun , Songkhla (Ton Nga Chang waterfalls), Yala (Kiong Bla Hot, Ban Mae Prik, Betong) . Distribution :— Malaysia , Brunei and Indonesia . Ecology :—On moist mountain slopes in dense evergreen forests at low to medium elevations, lower than 1,000 m elev. Specimens Examined :— THAILAND . Satun , A.F. G. Kerr 14444 (BK); ibid. A.F. G. Kerr 14590 (BK); Nakhorn Si Thammarat, Khao Luang, C. Apasutaya113 (BCU); Nakhorn Si Thammarat, Khao Luang, E. Hennipman 3799 (B); Trang , Khao Chong, H. Hennipman 3799 (L); ibid., H. Hennipman 3915 (L); Nakhorn Si Thammarat, Khao Nan , J.F. Maxwell 84-481 (PSU); Patthalung, Khao Pu Khao Ya, J.F. Maxwell 86-385 (PSU); Patthalung, Tamote, J.F. Maxwell 86-745 (PSU); Patthalung, J.F. Maxwell 86-747 (L); Nakhorn Si Thammarat, Yong waterfalls, K. Jamtsho, M. Stankovic & B. Hassama 5 (PSU); Patthalung, Tha Mot, K. Laesen et al. 459806 (L, QBG); Thailand, Chantaburi , Koh Chang; K. Larsen & T. Smitinand & E Warncke 1783 (BKF); Nakhorn Si Thammarat, Khao Luang, M. Tagawa , K. Iwatsuki & N. Fukuoka T4501 (L); ibid., M. Tagawa , K. Iwatsuki & N. Fukuoka T5271 (L); Songkhla , Ton Nga Chang waterfalls, N. Putthisawong 44 (PSU); Nakhorn Si Thammarat, Khao Luang, P. Pongkai 116 (BCU), Krabi , Khao Ngorn Nark, P. Pongkai 159 (BCU); Nakhorn Si Thammarat, Khao Nan , P. Pongkai 26 (BCU); ibid., P. Pongkai 27 (BCU); ibid., P. Pongkai 28 (BCU); ibid., P. Pongkai 29 (BCU); ibid., P. Pongkai 40 (BCU); ibid., P. Pongkai 46 (BCU); ibid., P. Pongkai 61 (BCU); ibid., P. Pongkai 64 (BCU); Phangnga , Toong Rha Suung, P. Suksathan 2509 (QBG); Nakhorn Si Thammarat, Khao Nan , T. Boonkerd, Y. Sirijamorn & C. Sanguansab 132 (BCU); ibid., T. Boonkerd, Y. Sirijamorn & C. Sanguansab 140 (BCU); ibid., T. Boonkerd, Y. Sirijamorn & C. Sanguansab 144 (BCU); Prachuap Khiri Khan , Huaiyang waterfalls, Y. Yuyen 175 (BCU). BRUNEI . Temburong , A.D. Poulsen 91 (K). INDONESIA . Kalimantan , A.C. Church, Ismail & A. Ruskandi 2476 (K); Bangka Island, Anta (K); Sumatra , C.G. Matthew s.n. (K); Sumatra , C.J. Brooks 2108 (BM); Kalimantan , C.S. Awmack 252 (K); Sumatra , E. Gardette 460 (K); Sumatra , J. Dransfield 3198 (K); Kalimantan , J.S. Tukirin 3107 (K); ibid., J.S. Tukirin 3325 (K); ibid., J.S. Tukirin 3107 (K); ibid., J.S. Tukirin 3325 (K); Kalimantan , M. Kato, G. Murata & Y.P. Mogea B3735 (K); Kalimantan , M. Kato, M. Okamoto & E.B. Walujo B9202 (K); Sumatra , P.W. Korthals s.n. (K); Sumatra , W.H. de Vriese 501 (K). MALAYSIA . Malacca , A.C. Maingay 3025 (K); Selangor , A.G. Piggott 2181 (K); Pahang , A.G. Piggott 3005 (K); Perak , B. Molesworth-Allen 2716 (K); Sabah , B.S. Parris & J.P. Croxall 8946 (K); Pahang , B.S. Parris 10375 (K); Penang , C. Curtis 1000 (K); Penang , C.G. Matthew s.n. (K); Selangor , C.G. Matthew s.n. (K); Selangor , D.W. Lee UL40 (K); ibid., D.W. Lee UL46 (K); Trengganu, E.A. Turnau 821 (K); Terengganu , E.J.H. Corner 30395 (K); Negeri Sembilan Bukit Tangga, E.S. Hose & G. Hose 5037 (K); Sabah , Forest Department, Sandakan SAN130860 (K); Perak , G.F. Hose s.n. (K); Malacca , H. Cuming 387 (K); Selangor , I.H. Burkill 11871 (K); Sabah , J. Clemens & M.S. Clemens 28155 (K); ibid., J. Clemens & M.S. Clemens 40565 (K); Pahang , M. Shah 1637 (K); Penang , N. Wallich 204 (K); Negeri Sembilan Ulu Bendul, R.E. Holltum 9865 (K); Sarawak , S.T. Lai S69628 (K); Penang , T. Lobb s.n. (K); Penang , W. Norris s.n. (K); Penang , W.F. Mactier s.n. (K). PHILIPPINES . Palawan , E.D. Merrill 7260 (K).