170 Evans : Hepaticae of Puerto Rico 



absent altogether, papilla marginal at base of apical tooth, sinus 

 shallow, keel slightly arched, forming a very obtuse angle with the 

 postical margin of the lobe ; cells of lobe plane or a little convex, 

 averaging 12 ji at the margin, 24 x 18 ft in the middle and 28 x 

 18/* at the base, trigones large, triradiate with rounded ends, 

 separated from the oblong to circular intermediate thickenings by 

 narrow pits : underleaves distant to loosely imbricated, appressed 

 on the caudex but more or less squarrose on the secondary stems 

 and sometimes revolute at the apex and along the sides, broadly 

 orbicular-obovate, averaging 0.35 mm. in length and 0.4 mm. in 

 width, cuneate at the base, rounded to subretuse at the apex: in- 

 florescence polyoicous: 9 inflorescence terminating a secondary 

 stem or one of its leading branches, innovating on one side or 

 rarely on both, the innovations short and sterile or soon again 

 floriferous, rarely terminating in an antheridial spike ; bracts erect- 

 spreading, deeply and unequally bifid, complicate, the lobe oblong- 

 obovate, 0.95 mm. long, 0.5 mm. wide, more or less convex and 

 often revolute along the postical margin and at the apex, lobule 

 ovate to ligulate, 0.4 mm. long, o. 1 5 mm. wide, rounded to subacute 

 at the apex, keel very short; bracteole obovate, averaging 0.75 X 0.4 

 mm., rounded to retuse at the apex ; perianth about half exserted, 

 oblong-obovate in outline, cuneate toward the base, 1.4 mm. long, 

 0.75 mm. wide, antical keel low and broad, lateral and postical keels 

 high and sharp, usually bearing narrow wings from one to three cells 

 wide and variously sinuate orsubcrenulate on the margin : 6* inflo- 

 rescence terminating a short branch, apparently not proliferating ; 

 bracts loosely imbricated, mostly in from three to six pairs, une- 

 qually bifid, the lobe oblong to rounded at the apex, lobule similar 

 but shorter and narrower, keel strongly arched; antheridia in 

 pairs ; bracteoles similar to the underleaves but smaller : capsule 

 about 0.4 mm. in diameter, yellowish-brown ; spores greenish, 

 irregular in form, about 16/w in short diameter, minutely verrucu- 

 lose; elaters git in diameter. (Plate 8, figures 1-8.) 



On a log. El Yunque, Evans (140). Type locality: Caracas, 

 Venezuela (herb. Hampe). The species has also been found on 

 the island of Great Bahama, Britton & Millspaugh. The type 

 material preserved in the Lindenberg herbarium agrees closely 

 with the Puerto Rico and Bahamian specimens. 



Archilejeunea viridissima is closely related to A. Anberiana. 

 Through the kindness of M. Paul Hariot the writer has been sup- 

 plied with a portion of the original material of the latter species 

 from the Montagne herbarium. It shows an autoicous inflores- 

 cence and agrees with A. viridissima in size, habit, and color. 



