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Rhizoids abundant from the scale-leaves, the bases of some branches, and the 

 base of the female inflorescence when on a very short branch ; stem hyaline to 

 pigmented with brown, in transverse section with a cortical layer of 12-24 rows 

 of large cells surrounding the medulla of cells of similar size. Line of leaf 

 insertion transverse. Leaves imbricate, variable in size even on oik stem, 

 subquadrate to longer than broad, 1.0-1.8 mm long, 1.0-1.6 mm wide, quadrifid, 

 often bisbifid, to one-fifth of their length, or smaller and bifid or trifid, the 

 lamina often 2-layered below, the margins entire, the segments triangular, acute 

 to blunt; leaf cells of the segments and upper part of the leaf 35x35 n, to 

 40-65 X 35 /j. in the lower part, or large throughout the leaf, the walls thin or 

 uniformly thickened, the trigones small, conspicuous, the cuticle smooth or 

 nearly so. Underleaves similar, sometimes a little smaller. Plants dioicous. 

 Male inflorescence in terminal spikes or becoming intercalary, on short slender, 

 erect branches with small, quadrate leaves and underleaves, trigonous; bracts 

 and bracteoles in four or more series, small, suggesting small quadrate leaves 

 with three or four short segments, very concave; antheridia single [?] in the 

 axils of the bracts, large, whitish. Female inflorescence terminal on a short leafy 

 branch from a rhizome or stolon, or a flagelliform axis, the bracts and bracteoles 

 similar to the leaves in outline, in two to four series, the innermost series largest, 

 quadrifid to one-sixth. Perianth to 4 mm long, cylindrical below, 3-keeled above, 

 the mouth contracted, with to 12 lanceolate laciniae. Elaters bispiral; spores 

 minutely verruculose, 18 p. in diameter. Sporophyte not seen. PI. 55. Fig. 2, a-h. 



Habitat: Abundant on peat mounds, occasionally on wood, in Sphagnum and 

 Polytrichum bogs and Sphagnum moors. 



PATAGONIA— TIERRA DEL FUEGO: 175-190 km along road from Punta Arenas to 

 Natales. Fulford 78 p.p., 82, 92, 93 p.p., 97, 99 p.p., 110a, 118b p.p., 119, 122, 246 p.p., 247 p.p., 

 248a, 249, 250, 269 p.p., 270 p.p., 281, 285 (Hb Fulford) ; Fuegia, Dmen [182] (type G-11102) ; 

 Fuegia, Halle the type of /. granditexta (type G-3693), the same (G-2692). Fuegia, Lago 

 Fagnano, Halle 127 (UPS). 



Additional localities are reported by Arnell (1955, 1958), Kiihnemann (1949) and 

 Stephani (1900a, 1901a, 1911). 



References 



Herzog, Th. 1951. Revision der Lebermoos Gattung Lembidium Mitt. Ark. Bot. II. 1: 471— 

 503. f.1-13. [1952]. 



Schuster, R. 1963. Studies on Antipodal Hepaticae I. Jour. Hattori Bot. Lab. 26: 185-309. 



Micropterygium Lindenberg in G. L. & N., Syn. Hep. 233. 1845. 



Leafy stems ascendent to erect from a prostrate, branched rhizome system, 

 whitish to green, becoming light or dark brown, in mats or scattered among 

 other bryophytes; stems simple or irregularly branched, the branches axillary, 

 intercalary, lateral branches leafy, ventral branches leafy or flagelliform; in 

 transverse section the stem with a cortical layer of 12 rows of slightly larger 

 cells with thick, light to dark brown walls surrounding the medulla of usually 

 colorless cells with thinner walls. Rhizome radial, with three rows of scale-leaves, 

 branched, the branches intercalary, like the rhizome, or flagelliform, or erect 

 radial, with three rows of small orbicular leaves and eventually becoming leafy, 

 or leafy from the beginning. Rhizoids branched at the tips, colorless to brown, 

 on the scale-leaves of the rhizome and the flagelliform branches. Line of leaf 

 insertion transverse to slightly oblique, attached to four cells of the stem, the 

 leaves equitant-imbricate. Leaves orbicular, broadly ovate, lanceolate to sub- 



