NOTEWORTHY LEJEUNEAE FROM FLORIDA I37 



Nees, are known from Florida. L. fioridana agrees with L. glaucescens 

 in most of its vegetative characters, but is distinguished from it by its 

 much larger bracts and bracteole, by the short keels of its perianth 

 (projecting slightly upward as horns), and by the fact that the female 

 branches are often long. These features will serve to separate the 

 species also from L. cladogyna. L. flava is distinguished by its larger 

 size, by its much larger underleaves (which are often imbricated), by 

 the variable length of its female branches, and by its usually well- 

 developed lobules of the Lejeimea type. 



3. Lejeunea lon'Gifissa Steph. 

 Lejeunea longifissa Steph. Sp. Hepat. 5: 747. 1915- [Fig. 3.] 



On bark of trees. Florida: Sanford, March, 1917, S. Rapp 8j>.. 

 Cuba: Monte Verde, February, 1859, C. Wright. The type material 

 was collected in Cuba, no further data being given by Stephani. 

 Since the type has not been available for comparison, the writer has 

 been dependent upon the original description, which agrees in all 

 essential respects with the specimens listed above. 



The plants are pale green and cling closely to the substratum, 

 forming thin irregular mats. As in so many of the Lejeuneae the best 

 development of the leaves is found on sterile branches, rather than on 

 those bearing sexual organs. In the latter position the lobules of the 

 leaves are often imperfectly formed, although they rarely show the 

 extreme reduction found in L. cladogyna and L. miniitUoha. On 

 sterile branches the leaves are loosely arranged and sometimes do not 

 overlap at all. The lobes are plane or nearly so and spread obliquely. 

 They are broadly ovate and slightly falcate, measuring, according to 

 Stephani, 0.67 x 0.4 mm. The Florida specimens do not attain these 

 dimensions, the largest lobes being about 0.4x0.3 mm., but the 

 Cuban specimens have lobes 0.3-0.6 mm. in length. The apex of 

 the lobe varies from rounded to very bluntly pointed, while the 

 margin is entire or vaguely sinuate. The lobule, when well developed, 

 is strongly inflated throughout, broadly ovate in outline, and measures 

 about 0.12 x 0.1 mm. The free margin is involute as far as the apical 

 tooth, which consists of a single, slightly projecting, blunt cell, with 

 the usual hyaline papilla on the proximal side. The leaf-cells have 

 thin walls with distinct trigones and frequent intermediate thickenings. 

 According to Stephani the marginal cells measure 18 m, the median 

 27 IX, and the basal cells 45 x 27 m, these measurements agreeing with 

 those made by the writer. 



