NOTEWORTHY LEJEUNEAE FROM FLORIDA 139 



The inflorescence is autoicous, as in all the other species of Lejeunea 

 known from the United States. The female inflorescence is sometimes 

 borne on a short branch and sometimes on a more or less elongated 

 branch. It innovates on one side and occasionally on both, the 

 innovations being sometimes short and sterile, sometimes again florif- 

 erous. The bracts are exceedingly variable. The lobe of the outer 

 bract is usually broad and blunt, the margin varying from entire to 

 coarsely and irregularly sinuate or toothed. The lobe of the inner 

 bract is usually narrow and sharper. The lobule of the outer bract 

 is also blunt in most cases and often shows two indistinct teeth at the 

 apex; the lobule of the inner bract is usually slender and long-pointed. 

 Unfortunately these differences between the bracts are not always 

 apparent. The bracteole is slightly connate on both sides; it is 

 deeply bifid with a narrow sinus and slender, long-pointed divisions, 

 and the margin is sometimes sparingly and irregularly toothed. The 

 perianth is obovoid and distinctly five-keeled, the dorsal keel being 

 shorter than the two ventral. The keels are crenulate and sometimes 

 show very narrow and interrupted wings. The apex of the perianth 

 is rounded or truncate and the beak is distinct. The measurements of 

 the involucral leaves and perianths which Stephani gives are somewhat 

 higher than those made by the writer. According to him the lobes 

 of the bracts measure 0.9x0.45 mm. while the perianth is said to 

 be 1.25 mm. long and 0.67 mm. wide. In the writer's experience the 

 lobes of the bracts measure 0.35-0.7 x 0.22^.35 mm., and the perianth 

 0.5-0.9x0.35-0.5 mm. Stephani speaks of the perianth as being 

 "quasi pedunculata," so that his measurements were evidently made 

 from plants which had passed maturity. In view of the great vari- 

 ation in size exhibited by the bracts and perianths, the discrepancies 

 just noted hardly seem sufficient to warrant a specific separation. The 

 male spikes vary in position and in length and apparently never pro- 

 liferate. They sometimes occupy short branches and sometimes 

 terminate long branches, and the bracts are mostly in two to six pairs. 

 The antheridia are borne singly or in pairs. 



Perhaps the most striking features of L. longifissa are the deeply 

 bifid underleaves, from which it receives its specific name, and the 

 variable perichaetial bracts, some of which at least have sharp- 

 pointed and coarsely toothed lobes. In all the other species of 

 Lejeunea known from Florida the lobes of the bracts are either rounded 

 or very bluntly pointed, while their margins are entire or vaguely 



