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 6. Diplazium donianum (Mett.) Tardieu (1932: 58) . Fig. 9 . Asplenium donianum Mettenius (1859: 177) . Type : INDIA . Assam , W . Griffith s.n. ( holotype K001089390 ) . Plants terrestrial. Stems creeping, 3–5 mm diameter, covered with scales at apex; scales 4–6 × 1 mm , linear, dark brown, margin thick and toothed. Fronds 50–60 cm , imparipinnate; petioles 20–30 cm , 5–6 mm diameter, green when living, brown when dried, black at lower portion, grooved above. Laminae 30–40 × 20–30 cm , oblong in outline, terminal pinna distinct from lateral one, glabrous, subcoriaceous, green; lateral pinnae 1–3 pairs, alternate, 15–20 × 3.5–5.0 cm, oblong or narrowly-lanceolate, apex acuminate, base acute or obtuse, margin entire or subentire, stalted; stalks 6–10 mm ; costa grooved with minute hairs on adaxial surface; veins free, veinlet simple or forked, extending to margin. Sori more than 1 cm , elongate along veins, longest on acroscopic side of veinlets, indusiate; indusia thin, persistance. Spores monolete, 55–72.5 × 35–50 μm, bilateral, concavo-convex to plano-convex, perispore present; ornamentation: prominent wing folds. FIGURE 9. Diplazium donianum (Mett.) Tardieu. A , whole plant. B, a part of pinna with sori. C, toothed and thick margin sc scale showing toothed and black marginal cells. A. Sathapattayanon 41 (BCU). Thailand : —NORTHERN: Chiang Mai ( Doi Suthep ), Nan ( Khao Nok ), Tak ( Doi Musoe ), Phitsanulok (Thung Salaeng Luang); NORTH-EASTERN: Loei ( Phu Kradueng ); EASTERN: Nakhon Ratchasima ( Khao Yai ); SOUTH-WESTERN: Kanchanaburi ( Thong Pha Poom ); CENTRAL: Nakhon Nayok ( Khao Yai ); SOUTH-EASTERN: Chanthaburi , Prachin Buri ( Khao Yai ), Trat ( Koh Chang ); PENINSULAR: Nakhon Si Thammarat ( Khao Luang , Khao Nan , Ron Phibun , Khiriwong ), Satun . Distribution: — Bhutan , India , Nepal , China , Taiwan Island , Japan , Myanmar , Vietnam , Malaysia and Singapore . Ecology: —On mountain slopes in light shade or in dense evergreen forests, usually below 1,000 m elev. Specimens Examined:— THAILAND . Satun , A.F. G. Kerr 14535 (BK); no locality, A.F. G. Kerr 9309 (BM); Kanchanaburi , Thong Pha Poom, A. Sathapattayanon 41( BCU); Loei , Phu Kradueng, E. Hennipman 3683 (L); Nakhon Si Thammarat , Khao Luang, E. Hennipman 3684 (L); ibis, E. Hennipman 3698 (L); Nakorn Ratchasima, Khao Yai, G. Murata, N. Fukuoka C. Phengklai T16254 (L); no locality, J.F. Maxwell 01–139 (L); Nakhon Nayok , Khao Yai, J.F. Maxwell 01–732 (L); Nakorn Ratchasima, Khao Yai, J.F. Maxwell 74–875 (BK, L); Prachinburi , Khao Yai, K. Iwatsuki & N. Fukuoka T7392 (L); Prachinburi , Khao Yai, K. Larsen, T. Smitinand & E. Warncke 313 (L); Phisanulok, Tung Salaeng Luang, M. Tagawa , K. Iwatsuki & N. Fukuoka T2039 (L); Nakhon Si Thammarat , Khao Luang, M. Tagawa , K. Iwatsuki & N. Fukuoka T4563 (L); ibis, M. Tagawa , K. Iwatsuki & N. Fukuoka T5269 (L); Nakhon Si Thammarat , Khao Luang, M. Tagawa , K. Iwatsuki, H. Koyama & A. Chintayungkun T14641 (L); Kanchanaburi , Thong Pha Poom, P. Pongkai 150 (BCU); ibis, P. Pongkai 152 (BCU), Chiang Mai , Doi Inthanon, P. Srisanga & P. Suksathan 3246 (QBG); Nakhon Nayok , Khao Yai, S. Chongko 9 (L); Nakhon Nayok , Khao Yai, S. Chongko 9 (BKF); no locality, Sangkachun 749 (K); no locality, T. Smitinand 5908 (K); Nan , Khao Nok, W. La–ongsri et al. 1993 (QBG). CHINA . Hong Kong, Alexander s.n (K); Guangdong , C.G. Matthew s.n. (K); no locality, D.E. Boufford & B. Bartholomew 24963 (BM); no locality, W.T. Tsang 22367 (BM). JAPAN . K. Iwatsuki 3023 (BM); M. Ogata 133 (BM); M. Tagawa 2733 (BM). SINGAPORE . T. Lobb 33 (K). TAIWAN ISLAND . T. Tanaka 367 (BM); VIETNAM . W.T. Tsang 29527 (K); MALAYSIA . Pahang , B. Molesworth–Allen 4170 (K). Note: —This species is similar to Diplazium bantamense in the field, but can be separated from the latter by having creeping rhizome, lacking gemmae and having stalk more than 5 mm long.