Hepaticae : Yale Peruvian Expedition of igii. 325 



thickenings narrowly oval, infrequent except near the base : underleaves 

 contiguous to loosely imbricated, plane, broadly orbicular, about 0.45 mm. 

 long and 0.55 mm. wide, cuneate at the base, broad and rounded or truncate 

 at the apex, entire throughout or sUghtly crenulate near the base : inflores- 

 cence apparently dioicous (male inflorescence unknown) : ^ inflorescence 

 borne on the stem or a leading branch, innovating on both sides, the inno- 

 vations soon floriferous, the secondary inflorescences innovating on one or 

 both sides with sterile innovations ; bracts unequal in size, those of the prim- 

 ary inflorescence suberect, the lobe of the larger one ovate, 1.2 X 0.9 mm., 

 gradually narrowed to a blunt point, entire, the lobe of the smaller 

 one more narrowly ovate, 0.8 X 0.45 mm., subacute, entire, lobule a small 

 basal fold, maximum size about 0.45 X 0.07 mm. but in extreme cases re- 

 duced to a hyaline papilla ; bracteole similar to the underleaves but relati- 

 vely narrower, about 0.75 X 0.8 mm., bracts and bracteoles of secondary 

 flowers smaller but otherwise similar to those of the primary flower ; perianth 

 sUghtly exserted, obovate in outUne from a cuneate base, i.i mm. long and 

 0.9 mm. wide (in secondary inflorescences only 0.9 X 0.8 mm.), truncate at 

 the apex with a short beak, antical surface concave, mostly smooth, rarely 

 with a spine or two in the apical region, postical surface with a broad rounded 

 keel bearing a few scattered spines in the apical portion, lateral keels bearing 

 broad wings extending from the apex sometimes to beyond the middle, 

 sharply and irregularly spinose, the spines usually six to ten on each wing, 

 mostly three to six cells long and two cells wide at the base but very variable : 

 capsule (immature) about 0.35 mm. in diameter. (Fig. 8.) 



The present plant is one of those species in which a prostrate 

 habit is retained through hfe and is remarkable for its entire, broad, 

 and usually rounded leaves. Its closest ally is perhaps D.phyllorhiza 

 (Nees) Schiffn., a species of the American tropics known to the writer 

 from descriptions only.^ This species, which shows the same habit 

 of growth as D. rotundata, is considerably more robust, the leaf-lobes 

 being 2.25 mm. long and 2 mm, wide, according to Stephani's des- 

 cription. It is further distinguished by its relatively broader leaves, 

 by its autoicous inflorescence, by the obovate-oblong lobes of its 

 perichaetial bracts, and by its spatulate bracteoles. 



XL Brachiolejeunea (Spruce) Schififn. 

 24. Brachiolejeunea densifolia (Raddi) Evans 



Brachiolejeunea bicolor (Nees) Schiffn.; Engler & Prantl, Nat. 

 Pflanzenfam. P: 128. 1895. 



Brachiolejeunea densifolia Evans, Bull. Torrey Club 35: 158. 1908.^ 



^ See Stephani, Sp. Hep. 5: 162. 1912. 



2 A full synonymy of the species may be found here. 



