Marsupella vermiformis (R.M.Schust.) Bakalin & Fedosov, 2019

Bakalin, Vadim A., Fedosov, Vladimir E., Fedorova, Alina V. & Nguyen, Van Sinh, 2019, Integrative taxonomic revision of Marsupella (Gymnomitriaceae, Hepaticae) reveals neglected diversity in Pacific Asia, Cryptogamie, Bryologie 20 (7), pp. 59-85 : 70-71

Marsupella vermiformis (R.M.Schust.) Bakalin & Fedosov , comb. nov., stat. nov.

( Figs 4 H-K; 5L-M)

Marsupella stoloniformis subsp. vermiformis R.M.Schust. , The Journal of the Hattori Botanical Laboratory 80: 72, fig. 13 (1996) (The type RMS 67-5379 is cited for F, but was not located).

Since the original description of this taxon is very short (only two lines) we provide a detailed morphological diagnosis of the species based on the material seen from Korea.

SPECIMENS EXAMINED. — Republic of Korea, Jeju-do, Mt. Halla, 33°21’42.1”N, 126°32’02.8”E, 1861 m, 21.IX.2012, S. S. Choi 120911, 120897, 120898 (JNU,VBGI).

DESCRIPTION

Plants strongly vermicular, forming loose patches, deep green when fresh then turning to brown to blackish brown in the herbarium, without red or purple pigmentation, orbicular in cross section, 100-140 Μm in diameter, 3-6 mm long, freely ventrally branched, from leafless “rhizome”, brownish to whitish in color, densely ventrally branched. Rhizoids virtually absent, to solitary, colorless, obliquely spreading, short (less than 100 Μm long). Stem 100-140 Μm in diameter, orbicular in cross section, outer layer cells with external wall thin to obscurely thickened, tangential walls subequally thickened, trigones small, concave, walls brown in color, 6-10 Μm in diameter, inner cells with walls unequally thickened, walls colorless, trigones moderate, concave. Leaves appressed to the stem (lacerate into two parts when try to detach), transversely inserted and oriented, not decurrent, widely triangular, 75-110 Μm long and 125-175 Μm wide, divided by V-shaped sinus descending to º/5-½ of leaf length into two subequal triangle lobes with acute apices. Cells in the midleaf 5-10 × 5-8 Μm, walls moderately thickened, trigones small, concave; cuticle smooth; oil-bodies 1-2 per cell, spherical, 2-3 Μm in diameter. Dioicous. Pants suddenly dilated to the perianth,

to form the head-like structure, perianth completely hidden within bracts, nearly conical, 75-100 Μm long and 200-230 Μm wide, smooth, perigynium 120-150 Μm long, with one pair of bracts; bracts nearly orbicular to orbicular-triangular in shape, c. 250 × 250 Μm, covering perianth and then occlude one with another.

Figures

FIG. 4. — A-G, Marsupella koreana Bakalin & Fedosov, sp. nov.: A, plant habit, B, cells in leaf middle, C, cells in the leaf margin, D-G, leaves; A-G, types from holotype Kor-23-18-15 (VBGI); H-K, Marsupella vermiformis (R.M.Schust.) Bakalin & Fedosov, comb. nov., stat. nov.: H, plant habit; I-K, leaves; H-K, types from Choi-120911, VBGI. Scale bars: A, D-G, 1 mm; B,C, 100 µm; H, 1 mm; I-K, 200 µm.