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Evans: Hepaticae of Puerto Rico 159 



ported from the West Indies. Neither of these has yet been found 

 in Puerto Rico, but a third species occurs in recent collections from 

 the island. It is apparently undescribed and may be characterized 



as follows : 



Brachiolejeunea insularis sp. nov. 



y 



Dull-yellowish or brownish-green, sometimes almost black 

 scattered or growing in depressed mats : stems 0.25 mm. in diam- 

 eter, sparingly pinnate, the branches obliquely to widely spread- 

 ing, similar to the stem but with somewhat smaller leaves, never 

 microphylious : leaves closely imbricated, the lobes slightly falcate, 

 ovate, 1. 2-1. 7mm. long, 0.85-1.2 mm. wide, rounded to subcordate 

 at the base and rounded or very obtuse at the apex, margin entire, 

 strongly outwardly curved from the antical base to the apex; lobule 

 ovate-triangular in outline, 0.85-1 mm. long, 0.35-0.45 mm. wide, 

 the inflated portion forming a conical water-sac about half as long 

 as the lobe, keel nearly straight from a more or less arched base, 

 usually forming a continuous line with the postical margin of lobe, 

 free margin rounded to cordate at the base, usually bearing from 

 eight to ten more or less distinct teeth, those normally developed 

 two or three cells long, one or two cells wide at the base and curved 

 inward toward the lobe, apical tooth very variable ; cells of lobe 

 more or less convex, averaging 14 /a at the margin, 28 x 22 [i in the 

 middle and 35 x 28/1 at the base, intermediate thickenings infre- 

 quent, oval : underleaves loosely imbricated, plane, broadly orbic- 

 ular, 0.6-0.7 mm. long, 0.75-0.85 mm. wide, distinctly auriculate 

 at the base with crenulate auricles, margin otherwise entire or ir- 

 regularly sinuate, apex broad, truncate to retuse : inflorescence 

 paroicous : 9 inflorescence borne on a long branch and innovating 

 on both sides ; bracts erect-spreading, indistinctly complicate and 

 unequally bifid, the lobe ovate to oblong, 1.4 mm. long, 0.85 mm. 

 wide, rounded to obtusely pointed at the apex, margin more or less 

 sinuate and crispate but not toothed, lobule adnate to lobe for 

 greater part of its length, ovate to oblong, 0.85 mm. long, 0.35 

 nim. wide, apex mostly acute, rarely blunt, margin mostly entire but 

 rarely with a tooth near the apex, wing broad, approximately semi- 

 circular, entire, usually adnate for its whole length ; bracteole 



lowed by subsequent authors. The synonymy of the species is as follows : Frullanoides 

 dmnfoha Raddi, Mem. Soc. Ital. Modena Fis. 19: 38. 1823; 20: //. 2. f. 5. 

 1829. Jungermannia bicolor Nees, in Martius, Fl. Bras, i 1 : 349. 1833. Lejeunea 

 bicolor Nees, in Montagne, Flor. Boliv. 66; d'Orbigny, Voy. dans l'Amer. Merid. 7'. 

 1839. Phragmicoma bicolor Nees, in G. L. & N. Syn. Hep. 294. 1845. Ptycho- 

 coleus densifolius Trevis. Mem. 1st. Lomb. III. 4: 4°5- l8 77- Lejeunea {Brachio- 

 Lejcunea) bicolor Spruce, Hep. Amaz. et. And. 131. 1884. Brachiolejeunea 

 bicolor Schiffn. in Engler & Prantl, Nat. Pflanzenfam. I 3 : 128. 1895. 



