1966] 



LEAFY HEPATICAE OF LATIN AMERICA — PART II 



275 



strongly convex, very thick-walled, the cuticle papillose-warty. Underleaves 

 absent on the leafy stem. Plants dioicous, the sexual branches short, ventral, 

 from near the base of the leafy stem. Male inflorescence short to long, hyaline, 

 catkin-like, the bracts and bracteolcs in several series, the bracts concave, the 

 bracteoles small ovate; antheridea borne singly. Female inflorescence with two 

 or three series of similar bracts and bracteoles, the inner series longest, long-ovate, 

 concave, the cells rectangular, the apex bifid, the margins lacerate. Perianth to 

 4 mm long, trigonous to cylindrical below, of two or three layers of cells, 

 contracted above with eight or nine folds or rounded keeled, the mouth fringed 

 with simple cilia three to six long cells. (Capsule oblong cylindrical, the wall 

 two-layered, the elaters bispiral, spores finely tuberculate; after Spruce.] PI. 65. 

 Fig. 1, a-h. 



Plate 65 



Fig. 1. Mytilopsis albifrons. 1 a. Leafy stem, dorsal view, X 75. 1 b. Leafy stem with a 

 ventral-intercalary leafy branch, ventral view, X40; L, juvenile [?] leaf; U, underleaves 

 on the basal part of the branch, W, wing. 1 c. Stem, dorsal view, X 75. 1 d. A leaf (complicate), 

 X 57. 1 e. Leaves, opened out, X50; W, wing. If. Transverse section through a leaf below 

 the winged keel, X 180. 1 g. Leaf cells, X 350. 1 h. Transverse section of a stem, X 140. 

 Drawn from the isotype. 



