(Reprinted from the American Journal of Botany, S: I31-I50, March, 1918.] 



NOTEWORTHY LEJEUNEAE FROM FLORIDA^ 



Alexander W. Evans 



Our knowledge of the Hepaticae occurring in Florida has been 

 materially increased during the past few years. This is due in great 

 part to the careful collections made by Mr. Severin Rapp in the 

 vicinity of Sanford, Orange County, although Dr. J. K. Small, Mr. N. 

 L. T. Nelson and other collectors have made notable discoveries. In 

 1915 Miss Caroline C. Haynes^ published a list of sixty-four species 

 which Mr. Rapp had found, including twenty-four members of the 

 Lejeuneae. In the present paper six additional Lejeuneae are noted. 

 Four of these are apparently undescribed, although one has already 

 been reported from Sanford under another name. One of the re- 

 maining species has been previously reported from Cuba and the 

 other from Jamaica. Of the new species two, according to our present 

 knowledge, are endemic to Florida. The number of Lejeuneae now 

 known from Sanford is twenty-nine; from the entire state of Florida, 

 forty-four; from the entire United States, forty-eight. 



I. Cololejeunea contractiloba sp. nov. 



Plants very delicate, pale green, scattered or growing in loose 

 mats: stems prostrate, 0.03 mm. in diameter, irregularly and some- 

 times abundantly branched, the branches widely spreading, similar 

 to the stem: leaves distant to subimbricated, obliquely to widely 

 spreading, the lobe plane or slightly convex, sometimes inflexed at the 

 apex, ovate to ovate-lanceolate, when well developed 0.2-0.3 mm. 

 long and 0.12-0. 18 mm. wide, but often considerably smaller, gradually 

 narrowed to an acute apex tipped with a single cell, both dorsal and 

 ventral margins rounded in the basal half and straight or nearly so 

 in the apical half, crenulate or denticulate from projecting cells; 

 lobule often rudimentary, when well developed broadly ovate, about 

 0.13 mm. long and o.ii mm. wide, strongly inflated throughout, apical 

 tooth consisting of a single rounded projecting cell, lying in a more 

 ventral plane than the rest of the free margin and bearing the hyalme 

 papilla at its dorsal base, proximal tooth scarcely evident, consistmg 

 of a rounded cell separated from the apical tooth by a single cell, smus 



1 Contribution from the Osborn Botanical Laboratory. 



2 Bryologist 18: 19-22. 1915. 



131 



; 



