Porella stephaniana (C. Massal.) S. Hatt., J. Hattori

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 : 219-220

2. Porella stephaniana (C. Massal.) S. Hatt., J. Hattori

Bot. Lab. 5: 81, 1951. ( Fig. 3)

Madotheca stephaniana C. Massal., Mem. Accad. Agric. Verona 73(2): 23, 1897.

Korean Name: Dong-gang-se-jul-i-kki (ǭġljẃḋnj)

220 JOURNAL OF SPECIES RESEARCH Vol. 1, No. 2

20.0µm 2.0 mm C D 1.5 mm E F H

A G

B

Plants 30.0-80.0× 3.2-3.8 mm, prostrate to ascending, green to dark green. Stems irregularly branched, brownish green to reddish green, cross section ca. 0.25-0.30× 0.40 -0.50 m, cortex cells smaller, thick-walled in 1-3 layers, 10.0-15.0×5.0-7.5 µm, inner cells larger, thin-walled, colorless, 15.0-30.0×12.5-20.0 µm, trigones concave. Rhizoids scarce. Leaves imbricate, falcately spreading; lobe obliquely inserted, line insertion arched, not decurrent, concave, obliquely ovate to broadly ovate, 1.5-2.5 × 1.2-1.5 mm, margin slightly crispate, incurved with 2- 5 dentate near base, apex acute; lobule transversely insert- ed, not decurrent, narrowly ligulate, parallel with the stem, 0.8-1.2× 0.4-0.5 mm, margin irregularly dentate, apex acute to obtuse. Cells in the median leaf polygonal, 25.0- 37.5×20.0-25.0 µm, trigones concave, marginal cells subquadrate 10.0-15.0×12.5-17.5 µm, trigones concave, basal cells 37.5-50.0×22.5-30.0 µm, trigones concave; cuticle smooth. Oil bodies 10-15 per cells, elliptical to spherical, slightly granulate, ca. 5.0-7.0×4.0-6.0 µm. Underleaves imbricate, transversely inserted, line insertion arched, short decurrent, oblong to narrowly ligulate, 0.9- 1.2× 0.4-0.5 mm, margin irregularly dentate, apex obtuse to truncate.

Habitats. On shaded limestone near the stream in broadleaved deciduous forest.

Distribution. Korea, China, Japan ( Hara, 1956; Hattori, 1978).

Specimens examined. Donggang River , Yeongwol-eup, Yeongwol-gun, Gangwon-do, N 37̊16 ′35.9′′ E 128̊32 ′ 05.8′′, Alt. 222 m, 17 Aug. 2010 leg. & det. S.S. Choi 7937 ( JNU; NIBR) .

Porella stephaniana is a calcicolous species. This species is characterized by (1) lobe stoutly dentate toward base of the ventral margin, (2) lobule dentate nearly throughout margin and (3) median cells 30.0-35.0×25.0 µm, marginal cells 20.0×15.0 µm, walls thin ( Hattori, 1978).

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