1962J 



LEAFY HEPATICAE OF LATIN AMERICA — PART I 



111 



Plants green; leaf cells with thin walls and small trigones; 

 margins of the underleaves broadly lobed and undulate, 

 with scattered hyaline cells on the top. 18. B. chimborazensis. 

 Plants large to small ; underleaves not strongly cordate, mostly 

 broadest above the middle; hyaline cells absent. 

 Underleaves deeply 4-lobed (at least those subtending the fla- 

 gelliform branches); leaf cells mostly 20-24 /i. 



14. B. quadricrenata. 

 Underleaves variously and irregularly incised-lobed above and 

 on the margins; leaf cells mostly 24-36/1, the trigones 

 large, knot-like. 15. B. awresccns. 



Underleaves mostly shortly incised or with only a few short incurved teeth 

 on the apical margin. 

 Leaf cells mostly 27-48 /i in length. 



Some of the underleaves hyaline above or throughout ; teeth of 



the leaves long and sharp (rarely short). 8. B. pallide-virens. 



Underleaves never hyaline. 



Underleaves twice as long as broad, conspicuously 4-lobed 



27. B. elongate 



Underleaves about as long as broad, faintly lobed between two 



incurved teeth. 26. B. sublonga. 



Leaf cells mostly 18-24/1 in the apical part of the leaf. 



Plants of medium size to large ; leaves spreading, cells 20-24 /i, 



underleaves broadest above the middle. 16. B. glaziovii. 



Plants small to thread-like ; underleaves quadrate to orbicular. 

 Leaves ascendent, vittate ; underleaves appressed ; cuticle coarse- 

 ly verruculose. 52. B. sprvceana. 

 Leaves spreading to falcate and decurved, narrowed to the 

 obliquely truncate apex; underleaves squarrose; cuticle 

 smooth to faintly verruculose. 23. B. tricrenata. 

 Underleaves with entire margins, or the apical margin retuse, or with three 

 or four broad shallow lobes and an occasional short spine. 

 Underleaves subquadrate. 



Plants large, green ; underleaves cordate at the base. 



Lateral margins of the underleaves entire, convex, recurved, the 



apex retuse. 19. B. acuminata. 



Lateral margins of the underleaves plane, often undulate or sinuate, 

 convex. 



Apical margin of underleaves lobed, incised, and with scattered 

 spines and teeth and occasional hyaline cells; lateral margins 

 lobed. 18. B. chimborazensis. 



Apical margin of underleaves entire or undulate with four broad 

 lobes (rarely with a spine). 

 Leaves strongly arcuate from a conspicuous rectangular ventral 



appendage; underleaves broadest at the base. 31. B. arcuata. 

 Leaves spreading or only slightly ascendent or decurved, a ven- 

 tral auricle scarcely developed. 17. B. breuteliana. 

 Plants large, yellow-brown to deep red-brown. 



Underleaves deeply 4-lobed. twice as long as broad. 27. B. elongata. 



Underleaves never deeply 4-lobed. 



Underleaves erenate-undulate, not cordate at the base; leaves 

 long, the teeth very long and coarse; cells of the apical 

 portion large, 45 X 27 /i, the walls uniform, very thick and 

 with small pits. 28. B. crassidentata. 



Underleaves cordate-auriculate, attached in a recurved line (see 

 sect. Appendiculatae) . 

 Plants smaller, not as above. 



Teeth of the leaves very small to obscure ; cells of the apical region 

 mostly quadrate, trigones small; underleaves distant, the margins 

 entire. 20. B. diversicuspis. 



