Diplazium subintegrum Holttum. A 1937
Creators: name: Pongkai, Puttamon
name: Zhang, Li-Bing
name: Boonkerd, Thaweesakdi
name: Pollawatn, Rossarin
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Polypodiopsida
Polypodiales
Athyriaceae
Diplazium
Diplazium subintegrum

description: 26. Diplazium subintegrum Holttum (1937: 125). Fig. 32.
Type: MALAYSIA. Pahang, Holttum, R.E. 31350 (holotype SING, isotype K000443923!).
Plants terrestrial. Stems erect, 5–6 cm diameter, densely scaly at apex; scales 12–15 × 2–3 mm, narrowly-lanceolate with long tail apex, brown, concolorous, margin entire with caducous membrane. Fronds 60–75 cm, pinnate; petioles 30–40 cm, 4–5 mm diameter, nearly black, glabrous, densely scaly at lower part. Laminae unipinnate 30–35 × 15–20 cm, outline oblong; terminal pinna distinct, about 10 × 4 cm, subdeltoid, apex acuminate, margin near base lobed; lateral pinnae 10–12 pairs, 10–15 × 2.0– 2.5 cm, narrowly oblong, apex acuminate, base round, margin subentire to crenate, dentate or serrate near apex, stalked; stalks 1.5–2.0 mm long; veins free, pinnate, veinlets 2 pairs. Sori 8–10 mm, elongate along veinlets, diplazoid, usually on acroscopic veinlets of vein group, indusiate; indusia linear, thin, pale brown, persistent. Spores monolete, 37.5–45.0 × 25.0–27.5 μm, bilateral, concavo-convex to plano-convex, perispore present; ornamentation: prominent wing folds.
Thailand: —NORTHERN: Phitsanulok (Salaeng Haeng); CENTRAL: Nakhon Nayok (Khao Yai); SOUTH-EASTERN: Prachinburi (Khao Yai), Chanthaburi (Khao Soi Dao), Trat (Koh Chang); PENINSULAR: Nakhon Si Thammarat (Khao Luang, Khao Nan), Yala.
Distribution: — Malaysia and Indonesia.
Ecology: —On rather dry ground near stream banks in light shade at 800–1,000 m. elev.
Specimens Examined:— THAILAND. Prachinburi, Khao Yai, C. Khunwasi 54 (BCU); Nakorn Nayok, Khao Yai, E. Hennipman 3998 (L); Nakorn Nayok, Khao Yai, J.F. Maxwell 01-535 (L); Nakorn Nayok, Khao Yai, K. Iwatsuki & N. Fukuoka T7379 (L); Nakorn Nayok, Khao Yai, K. Larsen, T. Smitinand & E. Warncke 163 (L); ibis., K. Larsen, T. Smitinand & E. Warncke 312 (L); no locality, M. Tagawa et al. T4790 (K); Nakhon Si Thammarat, Khao nan, P. Pongkai 35 (BCU); Nakhon Si Thammarat, Khao Luang, P. Pongkai 66 (BCU); Nakhon Si Thammarat, Khao Luang, P. Pongkai 67 (BCU) ibis., P. Pongkai 114 (BCU); ibis., P. Pongkai 115 (BCU); Nakorn Nayok, Khao Yai, S. Chongko 50 (L); Nakhon Si Thammarat, Khao Luang, T. Boonkerd 35 (BCU); Nakhon Si Thammarat, Khao Nan, T. Boonkerd, Y. Sirijamorn & C. Sanguansab 58 (BCU); Chanthaburi, Khao Soi Dao, T. Shimizu et al. T-23921 (L). INDONESIA. Java, PE-BO Team 28 (K). MALAYSIA. Pahang, A.G. Piggott 2424 (K); ibis., A.G. Piggott 2427 (K); Pahang, B. Molesworth-Allen 2929 (K); no locality, B.E.G. Molesworth-Allen 1328 (BM); Pahang, B.E.G. Molesworth-Allen 1712 (BM); Pahang, B.S. Parris 10583 (K); Perak, C.G. Matthew s.n. (K); Perak, H.C. Robinson s.n. (K); Selangor, H.N. Ridley 7844 (K); Perak, J. Day s.n. (K); Pahang, K.M. Wong 35205 (K); Perak, R. Jaman & Z. Mohamad 4148 (K); Pahang, R.E. Holttum 31350 (K); ibis., R.E. Holttum SFN23338 (K).
description: Published as part of Pongkai, Puttamon, Zhang, Li-Bing, Boonkerd, Thaweesakdi & Pollawatn, Rossarin, 2023, Revision of the fern genus Diplazium (Polypodiales: Athyriaceae) in Thailand, pp. 1-69 in Phytotaxa 631 (1) on page 56, DOI: 10.11646/phytotaxa.631.1.1, http://zenodo.org/record/10422862