340 Alexander W. Evans, 



The leaves are distant to loosely imbricated, and the convex 

 lobes spread widely from the axis but appear to spread obliquely 

 on account of the rcvolute apical portions (Fig. 11, A). The lobes 

 are ovate and measure about 1.3 mm. in length and 1.1 mm. in width. 

 At the antical base a large and dilated auricle is developed, which 

 often covers over more or less completely the hne of attachment 

 (Fig. 11, C). The margin is entire and the apex is broad and 

 rounded in the Peruvian material, although Spiuce says that it 

 is usually obtuse. 



The lobule, which measures about 0.7 X 0.35 mm., shows the 

 usual division into water-sac and appendiculum, these being about 

 equal in length. The water -sac is rounded above and inflated 

 in the upper and outer portions. The free margin spreads almost 

 at right angles from the axis and is more or less outwardly curved ; 

 the outer part of tlie margin forms a distinct angle with the rest 

 and meets the outer edge of the appendiculum at an obtuse angle, 

 forming however a very acute angle with the outer boundary of 

 the sac. In other words the apex of the lobule is not prolonged 

 as a free process. Most of the free margin is appressed but the 

 outer part is free and helps form the narrow cylindrical passage 

 into the sac. The appendiculum is ovate-triangular, the base 

 being at the sac, one side forming the outer edge, and the other 

 being at the keel between the lobule and the lobe. This keel, on 

 robust leaves at least, is curved inward, the end usually extending 

 to the antical surface of the axis and sometimes meeting the auricle 

 at the base of the lobe; on branch-leaves the keel is often straight 

 or nearly so. The stylus is minute and usually consists of a short 

 row of cells tipped with a hyahne papilla. 



The underleaves are large but rarely overlap except toward the 

 apex of a stem or branch. They are plane or somewhat revolute 

 along the sides and are orbicular in outline, measuring about 

 0.75 mm. in length. They are further distinguished b}^ being bifid 

 about one eighth their length, the divisions being sharp and the 

 sinus rounded. In most cases the divisions are triangular and 

 erect but they may be connivent. The margin is entire or nearh" 

 so, and the base is auriculate on each side (Fig. 11, D), the auricles 

 being usually involute along their inner edges in such a way that 

 the underleaf seems to end in two pointed processes (Fig. 11, A). 

 The modified underleaf at the base of a branch is broad and bears 

 a shallow apical sinus separating two blunt and divergent divisions 

 (Fig. 11, A, at base). 



Tlie leaf-cells average al)out Hi // along the margin of llic lolic, 



