Porella chinensis (Steph.) S. Hatt., J. Hattori Bot.

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 : 220-221

3. Porella chinensis (Steph.) S. Hatt., J. Hattori Bot.

Lab. 30: 131, 1967. ( Fig. 4 )

Madotheca chinensis Steph., Mém. Soc. Sci. Nat. Cherbourg 29: 218, 1894.

Korean Name: Deok-hang-se-jul-i-kki (Ḥḇljẃḋnj)

Plants 30.0-80.0×2.0- 3.5 mm, prostrate to ascending, green to brownish green. Stems frequently densely bipinnate, brownish green to reddish green, cross section ca. 0.20-0.25× 0.25-0.35 m, cortex cells smaller, thick-wall- ed in 2-3 layers, 12.5-20.0×10.0-12.5 µm, inner cells larger, thin-walled, colorless, 20.0-30.0×17.5-25.0 µm, trigones concave. Rhizoids scarce, fasciculate at base of underleaves, pale reddish brown. Leaves imbricate; lobe obliquely inserted, line insertion arched, not decurrent, concave, obliquely ovate to broadly ovate, 1.6-2.3×1.0- 1.4 mm, margin slightly crispate, slightly incurved, mostly entire to rarely toothed, apex obtuse to rounded; lobule transversely inserted, line insertion curving down from the level of the base of keel to 0.5-1.0 the stem wide, long decurrent, narrowly ligulate, parallel with the stem, 0.5- 0.7× 0.2-0.3 mm, lateral margins narrowly recurved, irregularly dentate, apex acute to obtuse. Cells in the median leaf polygonal, 30.0-37.5×25.0-30.0 µm, trigones concave, marginal cells subquadrate 20.0-25.0×15.0-20.0 µm, trigones concave, basal cells 30.0-37.5×25.0-30.0 µm, trigones concave; cuticle smooth. Oil bodies 10-20 per cells, elliptical to spherical, homogeneous, smooth, ca. 5.0-6.0×2.0-3.0 µm. Underleaves contiguous, transversely inserted, line insertion curving up the stem 1.0- 1.5 the stem wide, arched, long decurrent, repand-crispate, ovate to ligulate, 0.5-0.8× 0.4-0.9 mm, margin irregularly dentate, apex obtuse to acute- rounded.

Habitats. On shaded rocks or bark of tree in broad-leav- ed deciduous forest.

Distribution. Korea, China, Russia ( Hattori, 1967; Konstantinova et al., 2009).

Specimens examined. Mt. Deokhang , Anui-ri , Singimyeon , Samcheok-si, Gangwon-do, N 37̊ 19′24.2′′ E 129̊ 00′17.6′′, Alt. 664 m, 14 Oct. 2009 leg. & det. S.S. Choi 7006 (JNU; NIBR).

Porella chinensis is characterized by (1) lobe almost entire margin (2) lobule and underleaves long decurrent and (3) stems frequently densely pinnately-branchded ( Hattori, 1967). In the Korean flora, this species is easily distinguished from P. grandiloba by its long decurrent lobule and underleaves.

New Korean name is given as ‘Deok-hang-se-jul-i-kki’, is based on the name of locality.

Figures

Fig. 4. Porella chinensis (Steph.) S. Hatt. A. plant (ventral). B. underleaves. C, D. part of plant (dorsal). E-H. leaves. I. cells at leaf apex. J. median cells of leaf. Scale bars: 2.0 mm for A, C, D, G; 1.0 mm for E-H; 0.5 mm for B; 20.0 µm for I, J.