1962) 



LEAFY HEPATiCAE OF LATIN AMERICA — PART I 



109 



long, ascendent, becoming recuwvod to falcate from a broad base, the ven- 

 tral margin always concave, the teeth long, slender, the apical margin 

 serrate-dentate; cells of the apical portion mostly ----4 m long; under 

 leaves with a hyaline border, variously incised and lobed, the margin 

 coarsely dentate to serrate. 38. B. pcntiiana. 



Plants of medium size to small, to '2 mm broad; the leaves spreading to ascend- 

 ent, the ventral margin straight or convex, the teeth short, slender, short - 

 spinose or obscure, the apical margin more or less serrate. 

 Plants small, delicate, light green rarely becoming darker, the leaves spread 

 ing, with a suggestion of a vitta, the ventral margin convex; under- 

 leases incised, strongly serrate-dentate, hyaline to a third or more of 

 their length. I forms of] 38. B. peruviana. 



Plants more or less brown, often strongly so; leaves ascendent, the ventral 

 margin straight or nearly so, the teeth short to obscure, the apical mar- 

 gins more or less serrate, most cells of the apical region "27 /t or more in 

 length; underleaves mostly undivided (or with occasional broad, shallow 

 lobes or teeth), the margin entire or with a few serrations; hyaline cells 

 absent or a few scattered along the margin, or more forming a narrow 

 border. 39. B. skottsbergii. 



. Underleaves free from the leaves. 



D. Underleaves divided to the middle into long lobes or teeth (sect. 3, Fissisti- 

 pulae). Leaves sharply 3-toothed; trigones very large, rounded; leaf margins 

 coarsely crenulate. 40. B. chimantensis. 



1). Underleaves more or less entire or divided to not more than one-third their 

 length into lobes or teeth. 

 E. Leaves with a conspicuous, usually appendiculate ventral auricle; under- 

 leaves large, cordate, attached in a recurved line; the line of the leaf inser- 

 tion curved in the upper part, the dorsal end bent downward forming a 

 hook. (sect. 4, Appendiculatae). 

 Plants with leaf apices broad, rounded-entire, subentire or with three, short 

 broad lobes or teeth; leaves spreading. 

 Leaves rounded-entire, the trigones large, knot-like. 50. B. plncophylla. 



Leaves subentire or with three low, broad teeth ; cell-walls thin, the tri- 

 gones smaller. 49. B. canelensis. 

 Plants with the leaf apices conspicuously 3-toothed. 



Ventral auricles of the leaves and the margins and auricles of the under- 

 leaves undulate and serrate to dentate; cuticle rough. 41. B. schlimiana. 

 Ventral auricles of the leaves and the auricles of the underleaves not as 

 above. 



Plants very large, the leaves falcate ; underleaves with one or more very 

 long sharp teeth at a right angle to the lateral margin. 



48. B. acanthostipa. 

 Plants of medium size to large or robust; underleaves with short mar- 

 ginal teeth or lobes, or entire, or obscurely serrate. 

 Auricles of the underleaves large, with coarse teeth and/or deeply 

 incised, and with several conspicuous appendages; ventral auricles 

 of the leaves similar. 

 Plants robust; underleaves large, the margin obscurely serrate, the 



appendages of the auricles numerous. 51. B. macrostipula. 



Plants of medium size to large; underleaves variously lobed, toothed 

 or crenulate. 



Leaves short, narrowed from a very broad base to the obliquely 



truncate apex; cells 24r-27/i, the trigones small. 45. B. boliviano. 



Leaves long, becoming falcate; cells 18 the trigones large, knot- 

 like, [some tropical forms of] 42. B. falcata. 

 Auricles of the underleaves and the ventral base of the leaf variously 



toothed or lobed or entire, but only rarely with one or more 



appendages. 



Underleaves (at least some) conspicuously 4-lobed or -toothed; ven- 

 tral auricles of the leaves more or less conspicuous, with occa- 

 sional teeth or spines. 47. B. teretiuscula. 



