Evans: HeEpatricaAE oF Purerto Rico 541 
Brownish-green, growing in depressed mats, similar in general 
habit to S. transversale : stems 0.15 mm. in diameter: leaves im- 
bricated, the lobe plane or slightly convex along the antical side 
and sometimes revolute at the apex, scarcely falcate, ovate-oblong, 
mostly 1-1.2 mm. long and 0.7—0.85 mm. wide, rounded or sub- 
cordate at the base and arching across or just beyond the axis, 
antical margin slightly outwardly curved to the broad and rounded 
apex, postical margin nearly straight; lobule very variable and 
often poorly developed, in normal cases attaining a maximum size 
of 0.35 x 0.25 mm. but often only half as large, similar in struc- 
tureto that of S. ¢ransversale ; cells of lobe averaging 17 at the 
Margin, 28 in the middle, and 35at the base, local thickenings 
of the walls often inconspicuous : underleaves imbricated, plane or 
alittle concave (from below) and sometimes slightly reflexed at the 
apex, orbicular, 0.75 mm. long, abruptly cuneate and long-decur- 
rent at the base: inflorescence autoicous: subfloral innovation 
sterile or occupied by a male spike; perichaetial bracts similar to 
those of S. ¢zransversale but smaller, both lobe and lobule meas- 
uring 0.5—0.7 mm, in length and 0.25-0.35 mm. in width, usually 
rounded at the apex; bracteole ovate-rectangular, 0.5 mm. long, 
0.35 mm. wide, bifid one fourth to one third with a variable sinus 
and rounded to acute or apiculate divisions ; perianth about two 
thirds exerted beyond the bracts and usually extending beyond 
the leaves, I mm, long, 0.85 mm. wide, truncate at the apex and 
with a short beak, lateral keels winged in the upper part, the wings 
deeply and irregularly incised to within one or two cells of the 
keel, the alar teeth mostly from three to six cells long and one or 
two cells wide at the base, sometimes subdivided, postical surface 
with a low keel, rounded or sometimes two-angled in the upper 
part, surface-laciniae numerous, similar to the alar teeth, irregularly 
Scattered or sometimes more crowded along the angles of the pos- 
tical keel : 3 inflorescence occupying a short branch or a subfloral 
iMovation, rarely terminal on a longer branch, not proliferating : 
bracts mostly in from three to six pairs, imbricated, similar to those 
of S. transversale ; bracteoles mostly restricted to the base of the 
Spike: mature sporophyte not seen (PLATE 31, FIGURES 11-14). 
On rotten logs. Puerto Rico, without definite locality, Schwan- 
ecke. North slope of the Luquillo Mountains, Heller (779). The 
Species has also been collected in Surinam, the type locality, Aege?, 
Parker, and on the islands of Cuba, Underwood & Earle, and Guade- 
loupe, Marie. Through the kindness of correspondents the writer 
has been able to compare Heller's specimens with a portion of 
Kegel’s type material, with Schwanecke’s Puerto Rico specimens, 
