372 Evans : New West Indian Lejeuneae 



Indian Lejeuneae, not yet known from Puerto Rico and apparently 

 new, have been distinguished, and six of these are described and 

 figured in the present paper. One local species from the Blue 

 Mountains of Jamaica is made the type of a new genus; the 

 others belong to genera which have been discussed in connection 

 with the Puerto Rico flora, and the reader is therefore referred to 

 the series noted above for an account of the generic peculiarities. 

 The type specimens of the new species are preserved in the herba- 

 rium of the writer, at New Haven, Connecticut. 



Trachylejeunea dilatata sp. nov. 



Pale green, dull, scattered or forming thin depressed mats: 

 stems 0.085 mnl - i° diameter, loosely adherent to the substratum, 

 copiously and irregularly pinnate, the branches widely spreading, 

 simple or sparingly subdivided, often with smaller leaves than the 

 stem but not microphyllous : leaves contiguous to loosely imbric- 

 ated, the lobe strongly falcate, obliquely spreading, convex, abruptly 

 dilated from a narrow base, orbicular-obovate in general outline, 

 °- 3 570- 5 mm - long, antical margin decurrentby a single cell, straight 

 or slightly incurved near the base, then strongly outwardly curved 

 to apex, postical margin also outwardly curved, apex broad and 

 rounded, rarely very bluntly pointed, margin denticulate from pro- 

 jecting cells except close to antical base ; lobule inflated through- 

 out, abruptly contracted in the outer part to a circular opening, 

 ovate, 0.17 mm. long, 0.14 mm. wide, keel strongly arched, form- 

 ing an angle of about 90 with postical margin of lobe, free mar- 

 gin curved and entire, revolute, meeting surface of lobe at about 

 a right angle, apical tooth consisting of a slightly projecting cell, 

 short and blunt, bearing the hyaline papilla in a slight depression on 

 the proximal side, sinus straight or lunulate, forming with the apical 

 tooth the greater part of the opening into the water-sac ; cells of 

 lobe averaging 15 ft at the margin and 35 x 21 ju in the middle and 

 at the base, postical surface plane or nearly so, antical surface 

 varying from plane to convex and conical in passing from basal 

 and median regions toward the margin, walls thin throughout or 

 with very minute triangular trigones ; ocelli none : underleaves 

 distant, plane, orbicular, 0.12 mm. long, bifid to about the middle 

 with erect, acute to obtuse divisions, mostly three or four cells long 

 and three or four cells wide at the base, sinus obtuse, margin entire 

 or subdenticulate from projecting cells, sometimes unidentate on 

 sides, basal region cuneate : inflorescence autoicous : 9 inflores- 

 cence sometimes borne on a leading branch, sometimes on a more 

 or less abbreviated branch, innovating on one, rarely on both sides, 



