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Evans: Heparicar oF Pugerto Rico 563 
at first deflexed, making the perianth convex antically and concave 
postically, the postical keel running lengthwise through the con- 
cavity (FIGURE 22). As the sporophyte develops the perianth 
becomes more inflated, and the lateral keels tend to straighten 
out. The surface is perfectly smooth and the three keels are 
entirely destitute of both wings and teeth. 
The male branches also arise from both stem and primary 
branches (FIGURE 16). The inflorescence usually occupies the 
entire branch but occasionally proliferates at the apex. The 
bracts, which vary considerably in number, are imbricated and 
shortly bifid with acute lobes. The antheridia are borne in pairs, 
and the bracteoles, which extend along the whole length of the 
Spike, tend to be bidenticulate at the apex. 
BRYOPTERIS FILICINA (Swartz) Nees 
Jungermannia filicina Swartz, Prodr. Fl. Ind. Occ. 145. 1788. 
frullania filicina Raddi, Mem. Soc. Ital. Modena Fis. 19: 35. 
5o23, 
Frullania (Bryopteris) filicina Nees, Naturg. Europ. Leberm. 3: 
211 (footnote). 1838. 
Bryopteris filicina Nees ; G, L..N. Syn: Hep. 284... 1845. 
Lejeunea (Lryo-Lejeunea) filicina Spruce, Hep. Amaz et And. 113. 
1884. 
Dark-green, growing in loose tufts: secondary stems 10-15 
cm. long, 0.4 mm. in diameter, rather closely pinnate, the branches 
subopposite or distinctly alternate, spreading at an angle of about 
Be mostly 1.5-2.5 cm. long, rarely subdivided ; flagelliform 
branches none : leaves imbricated (even when wet), falcate, ovate, 
about 2 mm. long and 1 mm. wide on the stem, a little smaller on 
the branches, arching a little beyond the axis, antical margin more 
or less outwardly curved from the cordate or auriculate base to 
the acute apex, postical margin slightly curved, revolute for half 
its length or more, marginal teeth usually confined to the apical 
region, from one to three on each side of the apex, mostly two or 
three cells long from a broad base, margin otherwise entire or 
Yaguely sinuate ; lobule inflated, ovate, 0.2 mm. long, 0.17 mm. 
Wide, keel arched, water-sac opening directly into the revolute 
Portion of the lobe, free margin straight or slightly rounded in the 
outer part, without a distinct apex ; cells of lobe averaging 7 / at 
€ margin, 25x 11 in the middle, and 52x I4/ near the 
base, plane or nearly so, local thickenings large and more or less 
