1966] 



LEAFY HEPATICAE OF LATIN AMERICA — PART II 



247 



Key to the Species 



Leaves and underleaves of well developed stems tending to be conspicuously narrowed 

 at the four-Iobed apex; ? bracts and bracteoles divided to one-third or one-half; 

 perianth month crenulate. 1. L. lobulatum. 



Leaves and underleaves of well developed stems not usually so constricted; 9 bracts 

 and bracteoles divided to one-fourth or less; perianth mouth of 12 short laciniae. 



2. L. quail rifolium. 



1. Lembidium lobulatum Herzog, Arch. Escuel. Farm. Fac. Ci. Med. Cordoba 



1938 (7): 24. f. 9. 1938. 



Plants turgid, whitish green, in low dense tufts or among other bryophytes; 

 leafy stems erect, to 1 cm long, radial or nearly so, slender, from a densely 

 branched rhizome system, or from stolons, or fiagelliform prostrate axes; 

 luanches from the leafy stems not seen, branches from the fiagelliform and 

 stolon-like axes numerous, intercalary from all three rows of scales, forming 

 leafy branches or fiagelliform or stolon-like axes. Rhizoids from the scales of 

 fiagelliform branches and often from the female branch. Stem in transverse 

 section with a layer of cortical cells surrounding the medulla of similar cells. Line 

 of leaf insertion transverse. Leaves distant to imbricate to 1 mm long, 0.8 mm 

 wide, small on the lower part of the stem and increasing in size upward, ovate- 

 truncate, orbicular or subquadrate in outline, bisbifid, quadrifid, trifid or bifid to 

 one-sixth or less, the lamina often 2-layered below, the lateral margins entire to 

 convex; segments short, broadly triangular, blunt to acute; leaf cells below the 

 segments 20x40 n, the walls thin, the trigones inconspicuous or absent, the 

 cuticle smooth or nearly so. Underleaves like the leaves, on most stems as large 

 as the leaves. Female inflorescence terminal on a very short leafy branch, the 

 bracts and bracteoles in three or four series, the innermost series the largest, 

 quadrifid to one-fourth or one-third the length. Perianth [only one seen] 

 cylindrical below, 3-keeled above, the mouth contracted, crenulate. Male 

 inflorescence and sporophyte not seen. PI. 54. Fig. 1, a-g. 



Habitat: Not given. 



PATAGONIA: Corral a La Aguada, Hosseus 59 (type, Hb Herzog; isotype G-1789). 



2. Lembidium quadrilobum (Stephani) Fulford, comb. nov. 



Isotachis quadriloba Stephani, Bihang, Sv. Vet.-akad. Handl. III. 26 e : 54. 1900; Icon. 



Hep., Isotachis No. 56/57. 

 Isotachis granditexta Stephani, Sv. Vet.-akad. Handl. 49 9 : 68. /. 26 c-e. 1911; Icon. 



Hep., Isotachis No. 54. 



Plants turgid, in whitish, pale or dull green, or brownish tufts, or scattered 

 among other bryophytes; leafy stems slender, 0.5-3 cm long, erect or nearly so, 

 sparingly branched, from an abundantly branched rhizome system, or arising 

 from stolon-like or fiagelliform axes with three rows of scale leaves; branches 

 from the rhizome intercalary, ventral or lateral, erect leafy, or prostrate fiagelli- 

 form or stolon-like and abundantly branched, leafy branches often showing a 

 gradual transition in form and size of the leaves from scales to large leaves. 



inflorescence; P, a perianth; X 75. 1 e. Female bract of an intermedial series, with rhizoids 

 from the lower half, X 133. 1 f . Female bract of the innermost series, X 133. 1 g. Cells of 

 the mouth of the perianth, X 600. 

 Drawn from the original material. 



