Diplazium petelotii Tardieu (1932: 66)

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 : 39-42

publication ID	https://doi.org/ 10.11646/phytotaxa.631.1.1
DOI	https://doi.org/10.5281/zenodo.10422948
persistent identifier	https://treatment.plazi.org/id/DD531D17-E245-FFC7-09E9-BC6B1F5629A4
treatment provided by	Plazi
scientific name	Diplazium petelotii Tardieu (1932: 66)
status

Treatment

17. Diplazium petelotii Tardieu (1932: 66) View in CoL . Figs. 21 View FIGURE 21 , 22 View FIGURE 22 .

Type: VIETNAM. Tonkin, Pételot 542 bis (lectotype P01449498 !, designated here; isolectotypes P01449495 !, P01449499 !) .

Plants terrestrial. Stems stout, erect, up to 5 cm diameter, apex scaly; scale up to 12–15 × 1.0– 1.5 mm, linear with long tail apex, concolorous, dark brown, margin toothed. Fronds up to 1.2 m, bipinnate; petioles 54–58 cm, 4.5–5.5 cm diameter, deep green, base scaly, groove above. Laminae 60–62 × 40–50 cm, ovate-oblong in outline, glabrous, papyraceous, deep green; pinnae 8–10 pairs, upper pinnae suddenly becoming smaller upward to form pinnatifid apex, terminal pinna not distinct; lateral pinnae 25–30 cm × 5–7 cm, alternate, oblong, apex long acuminate, middle gradually becoming reduce upward to form pinnatifid apex, stalked; stalk 2–3 cm; pinnules 3.5–4.0 × 1.0– 1.5 cm, oblong, apex acute or round, base obtuse, margin subentire to slightly serrate, sometime lobed at basal pinnules, lobes about ¼ way to midrib; vein free, pinnate; veinlets 2–3 pairs. Sori 2–4 mm, along veinlet, linear, slightly curve, indusiate; indusia linear, thin, persistent. Spore monolete, bilaterally symmetrical, kidney-shaped, 52.84–33.68 × 31.15–26.18 µm; ornamentation smooth.

Thailand: —NORTHERN: Chiang Rai (Mae Kok), Chiang Mai (Doi Suthep), Phitsanulok (Phu Rom Rot) .

Distribution: — China and Vietnam.

Ecology: —On mountain slope in dense evergreen forests at 1,000–1,300 m elev.

Specimen examine:— THAILAND. Chiang Mai, Doi Suthep, S. Chodchoy 62 (KU). VIETNAM. Lao Cai, Van Ban District, H. van der Werff et al. 17346 (L); Tonkin, Pételot 542 (P).

Note: — We found three duplicates of Pételot 542 bis at P that collected by Pételot from Tonkin, Vietnam. We selected P01449498 ! as the lectotype because it is the most complete specimen .