Metzgeria consanguinea Schiffner (1893: 271)

Sukkharak, Phiangphak & Chantanaorrapint, Sahut, 2020, The liverwort genus Metzgeria (Metzgeriaceae, Marchantiophyta) in Thailand, Phytotaxa 441 (3), pp. 251-262 : 252

1. Metzgeria consanguinea Schiffner (1893: 271) ( Fig. 1 )

Type: — INDONESIA. “in summo apice montis Pangerango”, 20 February 1890, Karsten s.n. (holotype FH; isotypes BM, FH, G!, JE!, S, W) ( So 2003) .

Thallus dioicous, up to 1 cm long, 0.8–1.3 mm wide, dichotomously branched, appressed to the substrate, margins plane to slightly recurved, pale green. Thallus apex obtuse or ascending attenuated to form gemmiferous branch. Hairs single, straight, sparse; single on ventral side of midrib. Midrib in cross section orbicular, 66–76 × 75–83 µm, composed of 2–3 cells wide on both dorsal and ventral sides, 10–13 medullary cells, dorsal and ventral epidermal cells 11–16 × 33–40 µm, medullary cells 8–13 × 15–21 µm. Wing 10–18 cells wide; marginal cells 36–75 × 16–40 μm, median cells 33–50 × 25–47 μm. Oil bodies not seen. Antheridial branches not seen. Female involucres obovate, 0.1–0.2 × 0.1–0.2 mm, with hairs along margin. Sporophyte not seen. Gemmae ovoid, 83–100 μm in diameter, at apex and margin of attenuated branches.

Additional illustrations: — Kuwahara (1965a: Fig. 1h–n as M. harae ; 1968a: Fig. 1 as M. acuta ; 1969a: Figs. a–o as M. macrospora ; 1969b: Fig. 1 as M. acuta ; 1975: Fig. I, Fig. II as M. darjeelingensis , Figs. III–IV as M. macrocellulosa ; 1978a: Fig. 1 ; 1983: Fig. 1 as M. vandenberghenii ; 1986: Fig. 11 as M. agnewiae ); Piippo (1991: Fig. 2a–c as M. acuta , Fig. 2d–g ); Srivastava & Udar (1975: Figs. IX–XI as M. nilgiriensis ); Stephani (1985: Icon. n. 7554 as M. elliotii , n. 7572 as M. attenuata , n. 7646 as M. cuspidata Steph. nom. in sched., n. 7664 as M. longitexta ); Vanden Berghen (1948: Fig. 18E–I as M. elliotii ; 1951: Fig. 1 as M. convexa ); Zhu & So (2001: Fig. 12); Costa (2008: Fig. 29); So (2003: Fig. 1A–B ).

Ecology: —In Thailand, this species is found on branches, twigs, tree trunks, felled trees, and rocks in lowland evergreen forest, hill evergreen forest, and upper montane rainforest at altitude of 250–2300 m.

Specimens examined: — THAILAND. Chiang Mai: Chiang Dao Mt. , 19°23’ N 98°53’ E, 27 October 2017, Sukkharak 97/1189, 119/1196, 120/1196, 122/1198 (hb. Burapha Univ.) ; 28 October 2017, Sukkharak 168/1212 (hb. Burapha Univ.) ; 18 December 2017, Sukkharak 201/1230, 202/1230, 207/1232, 211/1232 (hb. Burapha Univ.).— Doi Pui , summit, 18°50’ N 98°55’ E, 28 November 1965, Touw 8602 ( BKF).— Doi Inthanon, 18°35’ N 98°30’ E, 17 December 1965, Touw 9580 ( BKF) ; 20 December 1965, Touw 10147 ( BKF) ; 18°33’ N 98°29’ E, 17 January 2010, Akiyama, Irie, Printarakul & Kanzai 1278 ( BKF). Prachinburi: Khao Yai National Park , Khao Khieo, 14°30’ N 101°30’ E, 16 February 1966, Touw 12132 ( BKF). Nakhon Si Thammarat: Khao Luang, 8°30’ N 99°45’ E, 2 February 1966, Touw 11412 ( BKF).—Khao Nan National Park, Khao Nan Yai, 8° N 99° E, 27 January 2007, Sukkharak 524 ( BCU) .

Distribution: —Worldwide ( Zhu & So 2001; So 2003; Costa 2008).

Notes: — Metzgeria consanguinea is easily separated from other Thai Metzgeria by the frequent production of attenuated branches.

Figures

FIGURE 1. Metzgeria consanguinea. A. Part of thallus with attenuated apex and gemma, dorsal view; g = gemma. B. Part of thallus with attenuated apex and gemma, ventral view; g = gemma. C. Part of thallus with obtuse apices, dorsal view. D. Part of thallus with obtuse apices, ventral view. E. Part of female thallus with involucres, ventral view. F. Marginal cells of wing and hairs, ventral view. G. Median cells of wing, dorsal view. H. Midrib and median cells of wing, dorsal view. I. Cross section of thallus. [A–E, G–I from Sukkharak 202/1230 (hb. Burapha Univ.); F from Sukkharak 168/1212 (hb. Burapha Univ.)].

FIGURE 2. Metzgeria furcata. A. Part of thallus, dorsal view. B. Part of thallus, ventral view. C. Part of female thallus with involucres and adventitious shoot, ventral view; a = adventitious shoot. D. Marginal cells of wing and hairs, ventral view. E. Median cells of wing, dorsal view. F. Midrib and median cells of wing, dorsal view. G. Cross section of thallus [All from Sukkharak 121/1197 (hb. Burapha Univ.)].