184 Evans: Hepaticae from Florida 



except along the free margin, which is more or less appressed to 

 the lobe. Two marginal teeth in the outer half of the lobule may 

 usually be discerned. The inner tooth when normally developed 

 points outward and consists of a row of two or three cells. The 

 outer tooth, situated midway between the inner tooth and the end 

 of the keel, is much larger and is apparently accountable for the 



specific name. This tooth points forward and is normally subulate 

 in shape, averaging perhaps eight cells long and two cells wide in 

 the lower half; it is, however, subject to a good deal of variation 

 in size and shape and sometimes bears a short secondary tooth near 

 the base. The underleaves are bifid to beyond the middle, and their 

 straight divisions spread widely and are obtuse or subacute at the 

 apex. D, uiiidentata is usually found on the bark of trees. Ac- 

 cording to Spruce * it is scarcely distinct from D. pellucida 

 (Meissn.) Schiffn., which also has a wide distribution in tropical 

 America. This latter species, however, is epiphyllous in habit and 

 the lobes of its leaves are usually hyaline-margined. 



4. Cololejeunea diaphana sp. nov. 



L 



r 



Bright- or pale-green, scattered or very loosely cespitose, often 

 mixed with other Lejewieae : stems prostrate and closely adherent 

 to the substratum, 0.035 mm. in diameter, sparingly and irregu- 

 larly branched, the branches widely spreading : leaves distant, ob- 

 liquely to widely spreading, the lobe ovate to lanceolate, 0.25 mm. 

 long, 0.15 mm. wide, attached by a very short and almost trans- 

 verse line of insertion, scarcely falcate, postical margin straight or 

 somewhat curved, forming a continuous line with the keel, antical 

 margin more strongly curved, apex acute to subobtuse, usually 

 tipped with a single cell, margin varying from entire to slightly 

 crenulate or denticulate from projecting cells ; lobule (when well- 

 developed) inflated, ovoid to obovoid, o.i mm. long, 0.07 mm. 

 wide, keel slightly arched, free margin curved, involute toward the 

 base, tipped at the apex with a rounded cell and bearing a short 

 blunt tooth midway between the apex and the end of the keel ; 

 stylus reduced to a single papilla ; leaf-cells plane or nearly so, 

 averaging 13 // at the margin, 18 x 13 // in the middle and 30 X 

 \6 p. at the base, thin-walled throughout or with very minute tri- 

 gones : inflorescence autoicous : 9 inflorescence sometimes on a 

 short branch, sometimes on a leading branch, innovating on one 

 side, the innovation sterile or again floriferous; bracts erect-spread- 



* Hep. Amaz. et And. 302. 1884, 



