NOTEWORTHY LEJEUNEAE FROM FLORIDA 1 45 



0.3 mm. wide, the inflated portion forming a nirrowly ovate water- 

 sac, keel strongly arched near the base, then almost straight and 

 forming a very wide angle with the slightly involute ventral margin 

 of the lobe, free margin rounded at the base, then almost straight to 

 junction with lobe (including the apical sinus), bearing usually from 

 five to seven short and strongly inflexed blunt teeth, each consisting 

 of a single projecting cell and separated from its neighbors by about 

 two cells, apical tooth like the others, hyaline papilla proximal to the 

 apical tooth and situated on the dorsal surface of the second cell from 

 the margin, cells of lobe more or less convex, averaging about 13 ^t 

 at the margin, 25 x 20 ;a in the middle, and 32 x 16 /x at the base, 

 trigones distinct, triangular, mostly with two convex sides and one 

 concave side, intermediate thickenings infrequent, oval: underleaves 

 loosely to closely imbricated, plane, broadly orbicular, mostly 0.3- 

 0.35 mm. long and 0.35-0.4 mm. wide, apex rounded to truncate, 

 base shortly cuneate, rounded, or minutely and indistinctly auriculate, 

 margin entire: inflorescence dioicous: d^ inflorescence at first terminal, 

 afterwards proliferating; bracts mostly in six to ten pairs, closely 

 imbricated, similar to the leaves but the lobe relatively broader, 

 lobule with a broader inflated portion, ovate, truncate at the outer 

 end, the sinus forming about a right angle with the rest of the free 

 margin, apical tooth one or two cells long, not inflexed, margin other- 

 wise entire or nearly so; bracteoles similar to the underleaves; an- 

 theridia in pairs : vegetative reproduction by means of small caducous 

 leaves borne on specialized upright branches with persistent squarrose 

 underleaves: 9 plant unknown. [Fig. 5.] 



On bark of trees. Florida: Sanford, March, 1911, and May, 

 1912, 5. Rapp; Robinson's Spring, eight miles south of Sanford, May, 

 1917, S. Rapp. Honduras: in deep swamp along Highland Creek, 

 near Puerto Sierra (Tela), at about sea-level, February, 1903, P. 

 Wilson 56g. The Florida plants lack both antheridia and archegonia; 

 the Honduras specimens bear antheridia only. Mr. Rapp's specimen, 

 collected in 191 7, may be designated the type. 



The close relationship existing between Ptychocoleus and Brachio- 

 lejeunea has already been emphasized by the writer in another con- 

 nection.'* In their vegetative organs the two genera are essentially 

 alike, and the only constant difference between them is the absence of 

 subfloral innovations in Ptychocoleus and their presence in Brachio- 

 lejeunea. Since the plants just described are wholly without arche- 

 gonia it is clearly impossible to determine their generic position beyond 

 all question. They are referred to Ptychocoleus largely on account of 

 their caducous leaves, borne on specialized branches, the leaves 



* Bull. Torrey Club 35: 161, 162. 1908. 



