Metzgeria leptoneura Spruce 1885
Creators: name: Sukkharak, Phiangphak
name: Chantanaorrapint, Sahut
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Plantae
Marchantiophyta
Jungermanniopsida
Metzgeriales
Metzgeriaceae
Metzgeria
Metzgeria leptoneura

description: 4. Metzgeria leptoneura Spruce (1885: 555) (Fig. 4)
Type: — PERU. “in monte Campana andium, Spruce s.n. ” (holotype MANCH; isotypes F, G, W) (So 2003).
Thallus dioicous, up to 2.9 cm long, 0.7–1 mm wide, dichotomously branched, appressed to the substrate to convex dorsally, margins strongly recurved, light green. Thallus apex slightly obtuse. Hairs double, strongly curved, numerous; 2 rows on ventral side of midrib. Midrib in cross section orbicular, 141–146 × 98–103 µm, composed of 2 cells wide on both dorsal and ventral sides, 20–25 medullary cells, dorsal epidermal cells 18–20 × 46–50 µm, ventral epidermal cells 61–63 × 38–41 µm, medullary cells 13–33 × 11–21 µm. Wing 14–24 cells wide; marginal cells 50–66 × 23–33 μm, median cells 45–73 × 21–41 μm. Oil bodies not seen. Antheridial branches spherical, 0.2–0.3 × 0.2–0.4 mm, midrib present, without hair. Female involucres obovate, 0.1–0.2 × 0.2–0.3 mm, with hairs along margin, on outer surface. Capsule spherical, valve 0.1–0.3 × 0.5–0.7 mm. Elaters spiral, brown, 250–370 × 5–7 μm, with a single helicoidal band of thickenings. Gemmae at apex and margin of branches.
Additional illustrations: — Kuwahara (1958: Figs. I2, II5, 12, V10–20 as M. hamata; 1960: Fig. 5a–f as M. parvipapulosa, Fig. 10k, l as M. hamata; 1966: Fig. 1a–g as M. hamata; 1968a: Fig. 2 as M. iwatsukii; Fig. 7 as M. sharpii; 1969c: Pl. 94d as M. renauldii); Piippo (1991: Figs. 9, 11–12, Figs. 5, 7d–i as M. australis); Stephani (1985: Icon. n. 7552 as M. allanii, n. 7565 as M. recurva, n. 7566 as M. renauldii, n. 7579 as M. leptoneura, n. 7645 as M. curviseta, n. 7663 as M. longipila, n. 7671 as M. papulosa, n. 7676 as M. sandei, n. 7678 as M. atrichoneura, n. 7679 as M. colensoi); So (2003: Fig. 3d).
Ecology: — Metzgeria leptoneura in Thailand is collected from branches, branchlets, twigs, tree trunks, base of trees, fallen trees, logs, moist soil, and mixed soil, roadside bank in hill evergreen forest, evergreen forest along stream, mossy hill evergreen forest rich in Ericaceae, moist area of dense forest with partial shade light, moist area of open forest with partial light at the altitude ranging from 700–2570 m.
Specimens examined: — THAILAND. Chiang Mai: Doi Pui, 18 Novermber 2004, Santanachote 287 (CMUB); 11 December 2005, Santanachote 511 (CMUB).— Doi, Inthanon, 18°35’ N 98°30’ E, 18 December 1965, Touw 9702, 9707, 9736 (BKF); 18°33’ N 98°29’ E, 20 January 2010, Akiyama, Irie, Printarakul & Kanzai 1322 (BKF); 17 January 2010, Printarakul 2818, 2873 (CMUB); Ang-ka, 31 December 1974, Patanapolpaiboon s.n. (BCU); 14 December 1978, Thaithong 826 (2 packages), 802, 833, 845, 851, 855, 860, 939 (BCU); 9 August 2005, Santanachote 510 (CMUB); 9 March 2011, Printarakul 3601, 3621 (2 packages) (CMUB); 15 April 2012, Printarakul 5255 (CMUB); Doi Hua Suea, 18°29’ N 98°33’ E, 27 October 2018, Kraichak 1754 (hb. Kasetsart Univ.); Kew Mae Pan Nature Trail, 18°33’ N 98°28’ E, 28 October 2018, Kanjananuch 20 (hb. Kasetsart Univ.). Trat: Koh Chang, 30 December “1974”, Jintana, Ariya, Suwanna s.n. (BCU). Nakhon Si Thammarat: Khao Luang, 8°30’ N 99°45’ E, 7 February 1966, Touw 12005 (BKF).— Khao Nan National Park, Khao Nan Yai, 13 March 2006, Sukkharak 206 (BCU).
Distribution: —Worldwide (Zhu & So 2001; So 2003).
Notes: —The species characterized by 1) strongly decurved thallus margin, 2) marginal hairs of thallus strongly falcate and hooked, usually in pairs, and 3) ventral epidermal cells of midrib very large and protruding, triangular in cross-section.
description: Published as part of Sukkharak, Phiangphak & Chantanaorrapint, Sahut, 2020, The liverwort genus Metzgeria (Metzgeriaceae, Marchantiophyta) in Thailand, pp. 251-262 in Phytotaxa 441 (3) on page 257, DOI: 10.11646/phytotaxa.441.3.2, http://zenodo.org/record/13872573