Plagiochila shangaica Steph., Sp. Hepat.

Choi, Seung Se, Bakalin, Vadim A., Kim, Chul-Hwan & Sun, Byung-Yun, 2012, Unrecorded liverwort species from Korean flora II, Journal of Species Research 1 (2), pp. 218-223 : 218-219

1. Plagiochila shangaica Steph., Sp. Hepat. 6: 216, 1921. ( Fig. 2 )

Korean Name: Hae-an-nal-gae-i-kki (Ñüṽfflḋnj)

A C E B

Plants 30.0-70.0× 2.5-3.5 mm, prostrate to ascending, yellowish green to brownish green. Stems dichotomously branched, brownish green to reddish green, cross section ca. 0.25-0.30× 0.20-0.25 m, cortex cells smaller, thick-walled in 2-3 layers, 12.5-17.5×10.0-12.5 µm, inner cells larger, thin-walled, colorless, 15.0-17.5×12.5-25.0 µm, trigones concave. Rhizoids scarce. Leaves contiguously to imbricate, horizontally spreading, obliquely inserted, obliquely ovate to oblong, dorsal insertion line straight, recurved, ventral insertion line arched, shortly decurrent, 1.7-2.0× 0.7-1.3 mm, margin entire, apex broadly round- ed. Cells in the median leaf polygonal, 25.0-30.0×20.0- 25.0 µm, trigones triangular, marginal cells subquadrate 20.0-25.0×17.5-22.5 µm, trigones concave, basal cells 25.0-40.0×20.0-32.5 µm, walls intermediate thickenings, trigones convex; cuticle smooth. Oil bodies (2-)4-5(-6) per cells, ovate to elliptical, grape-cluster, ca. 9.0-15.0× 6.0-9.0 µm. Underleaves mostly vestigial, sometimes linear, 0.20-0.25× 0.10-0.12 mm.

Habitats. On shaded rocks near the small stream in broadleaved evergreen forest mixed with deciduous trees.

Distribution. Korea, China, Japan ( So, 2001).

Specimens examined. Mt. Geumo, Yullim-ri, Dolsaneup, Yeosu-si , Jeollanam-do, N 34̊35 ′32.7′′ E 127̊48 ′ 00.3′′, Alt. 105 m, 24 Feb. 2010 leg. & det. S.S. Choi 7127 ( JNU; NIBR); Mt. Doksil, Gageodo-ri, Heuksan-myeon , Sinan-gun , Jeollanam-do, N 34̊04 ′53.2′′ E 125̊06 ′22.5′′, Alt 516 m, 1 Feb. 2008 leg. & det. S.S. Choi 17-28b ( JNU; NIBR); Mt. Duryun, Samsan-myeon, Haenam-gun , Jeollanam-do, N 34̊28 ′19.0′′ E 126̊37 ′09.1′′, Alt 209 m, 23 Apr. 2010 leg. & det. S.S. Choi 7300 ( JNU; NIBR); Sangwangbong, Daesin-ri, Wando-eup, Wando-gun , Jeollanam-do, N 34̊ 20′55.0′′ E 126̊ 40′20.2′′, Alt 190 m, 9 Feb. 2010 leg. & det. S.S. Choi 7023 ( JNU; NIBR) .

Plagiochila shangaica is characterized by (1) stem dichotomously branched, (2) leaves oblong to ovate and (3) leaves margin entire ( So, 2001). In the Korean flora, this species is easily distinguished from the other Plagiochila species by its entire margin.

New Korean name is given as ‘Hae-an-nal-gae-i-kki’, is based on the habitat (seacoast) of locality. The ‘Haean’ means seacoast in Korea.

Figures

Fig. 2. Plagiochila shangaica Steph. A. plant (dorsal). B. plant (ventral). C. median cells of leaf. D. cells at leaf apex. E. basal cells of leaf. F-I. leaves. Scale bars: 1.0 mm for A, B, F-I; 20.0 µm for C-E.