378 Evans: New West Indian Leteuneae 



The underleaves of Leiolejeunea agree in all essential respects 

 with those of Harpalejeunea, and this peculiarity will at once serve 

 to distinguish the genus from all the other genera of the Lejeuneat 

 Schizostipae. The leaf-lobes and leaf-cells are also much the same 



Harpalej 



characters derived from 



the lobules, bracts, and perianths are so striking that the two 

 genera could hardly be united. In Leiolejennea the apical tooth of 

 the lobule forms a continuous line with the proximal portion of 

 the free margin, while the hyaline papilla is distal in position and 

 slightly displaced from the apical tooth; in Harpalejeunea the 

 hyaline papilla is situated at the proximal base of the apical tooth 

 in a slight indentation. In Leiolejeunea the lobes of the bracts 

 are much larger than the lobules, the latter being reduced to small 

 basal folds ; in Harpalejeunea the lobules are always distinct and are 

 only a little smaller than the lobes. In Leiolejeunea the perianth 

 is practically smooth, the only indications of keels being five very 

 vague and slight elevations in the apical region ; in Harpalejeunea 

 the perianth develops five sharp keels. The absence of true sub- 

 floral innovations in Leiolejeunea and their constant presence in 



Harpalejeunea should also be emphasized in distinguishing the 

 genera. 



In the majority of the Lejeuneae with bifid underleaves, the 

 hyaline papilla of the lobule is proximal in position, agreeing in 

 this respect with Harpalejeunea. Both Euosmolejeunea and Cheilo- 

 lejeunea, however, show a distal papilla, which perhaps indicates 

 some relationship with Leiolejeunea. In Euosmolejeunea the rela- 

 tively large underleaves with pointed divisions and the sharply 

 five-keeled perianth afford distinguishing peculiarities, while in 

 Cheilolejeunea the divisions of the underleaves are also pointed 

 and the strongly flattened perianth shows sharp lateral keels and 

 a more or less distinct postical keel. The genus Leiolejeunea is at 

 present monotypic, being based on the following species : 



Leiolejeunea grandiflora sp. no v. 



Dull, yellowish green, growing in depressed mats : stems 0.05 

 mm. in diameter, loosely adherent to the substratum, irregularly 

 Pinnate, the branches widely spreading, never microphyH° us •" 

 leaves mostly more or less imbricated, the lobe falcate -ovate, 0.35 

 mm. long, 0.25 mm. wide, antical margin decurrent by a single 



