Evans : New West Indian Lejeuneae 373 



the innovations sterile or rarely again floriferous ; bracts obliquely 

 spreading, complicate, keel sharp but not winged, lobe oblong to 

 obovate, 075 mm. long, 0.45-0.55 mm. wide, margin as in the 

 leaves, lobule ovate-lanceolate, obtuse, 0.4 mm. long, 0.17 mm. 

 wide, margin entire or nearly so ; bracteole very slightly connate 

 on both sides, oblong, 0.4 mm. long, 0.35 mm. wide, bifid about 

 one third with erect obtuse lobes, and an obtuse or subacute sinus, 

 margin vaguely and irregularly crenulate from projecting cells • 

 perianth slightly exserted, ovoid, 0.6 mm. long, 0.35 mm. wide' 

 cuneate toward base, truncate or retuse at apex with a short beak 

 crenulate at the mouth, slightly compressed, sharply five-keeled in 

 upper part, each keel bearing two denticulate wings, one or rarely 

 two to five cells wide, surface otherwise smooth or nearly so : c? 

 inflorescence occupying a short branch or terminal on a more or 

 Jess elongated branch, not proliferating; bracts mostly in two to 

 Wteen pairs, loosely imbricated, much smaller than the leaves, 

 strongly inflated, slightly and subequally bifid, the lobes rounded 

 and crenulate at the apex, keel strongly arched, crenulate; anther- 

 wain pairs : capsule about 0.2 mm. in diameter; spores irregular 

 jn lorm about 12 fx in short diameter, greenish, minutely verrucu- 



los e. (Plate 26, figures 1-13.) 



On leaves of ferns. Jamaica : Mabess River, Maxon (1544), 

 *vans(3ll). Dominica r Laudat Mountain, Lloyd {102). The 

 specimens collected by the writer may be considered the type. 



Except for the delicate texture of the plants and the roughness 

 the leaf-lobes, the present species might be placed in the genus 

 ejeunea. In fact Trachylejeunea and Crossotolejeunea have 

 •j many characters in common that the line of demarcation be- 

 ween them is largely artificial. The roughness in T. dilatata is 

 restricted to the outer or antical surface of the lobe and to the 

 J t of the Perianth, the surface of the lobule and of the perianth 

 m ^! een the keels being smooth. Even in the lobes the basal and 



n regions are smooth and the roughness is sometimes con- 



nnpn f 



th' t a V6ry narrow border - It is not produced by a wart-like 

 b . emn £ of the walls as in certain other members of the genus 



U 11 UG t0 t ^ G ^ aCt ^ at ea °k ce ^ 1S stron gly convex or conical. 



a y the walls are thin throughout, but occasionally minute 



^'gones and very slight thickenings at the apices of the conical cells 



^ay be demonstrated. The great disparity in size between the 



abr u ' an and marginal cells is a striking feature of the plant. The 

 u Pt dilation of the lobe, the marginal denticulations, and the 



so 



