its denticulate bracts. The gemmse in C. diaphana are somewhat more com- 

 plex than in C. Camilli, each half being composed of ten or twelve cells and each 

 apical quadrant cutting off three or four segments. In other respects the gem- 

 mae are much the same, each kind showing three organs of attachment and 

 projecting marginal cells. 



7. Lejeunea spiniloba Lindenb. & Gottsche; G. L. & N. Syn. Hep. 

 770. 1847. 



Collected in September, 1910, at San Diego de los Banos, Pinar del Rio, 

 Cuba, on limestone rocks, by N. L. Britton, F. S. Earle, and C. S. Gager (No. 

 6y22). New to the West Indies. The species was based on specimens collected 

 by Liebmann at Colipa, Vera Cruz, Mexico. In 1890 it was found by C. G. 

 Pringle at Tamasop, San Luis Potosi, Mexico. No other stations have been 

 reported. In the original description of this interesting species only the vege- 

 tative organs are alluded to. Later, however, Gottsche added an account of 

 the bracts and perianths.^ 



The most striking feature about the plant is the lobule. Instead of being 

 in the form of a short inflated sac, as is usual in the Lejeuneae, it is a slender 

 and plane lamina, ligulate to lanceolate in outline and extending parallel or 

 nearly so close to the axis. It is sometimes straight but is often more or less 

 curved with the concavity turned toward the axis. When well developed the 

 lobule, which measures about 0.35x0.06 mm., is mostly fifteen to eighteen 

 cells long and three or four cells wide throughout the greater part of its extent. 

 It tapers somewhat toward the apex, which is commonly tipped by two cells 

 side by side, more rarely by a single cell. The hyaline papilla is apical in posi- 

 tion. In poorly developed plants the lobule may be only two cells wide. The 

 lobe measures about 0.7 x 0.55 mm.; it spreads widely from the axis and is 

 broadly ovate and entire with a rounded apex. The leaf-cells, which are about 

 25 M in diameter in the middle of the lobe, have thin walls with minute and in- 

 distinct trigones. The underleaves measure about 0.35 x 0.15 mm. They 

 are distant, narrowly ovate, and sharply bifid for about half their length with 

 erect lanceolate divisions. In the perichaetial bracts the lobules are usually 

 five or six cells broad and are more sharply pointed than in the leaves, the apex 

 being commonly tipped with two superimposed cells. The perianth is five- 

 keeled, the dorsal keel being short and low. 



A close relative of L. spiniloha is L. pililoha Spruce, ^ a species now known 

 from southern Florida and from several of the West Indian Islands. In this 

 plant the lobule is filiform and consists of a single row of cells throughout most 

 of its length. Here, as in L. spiniloba, the hyaline papilla is situated at the apex. 

 The generic position of these two species is a matter of some doubt. At one 

 time the writer regarded L. pililoha as a member of the genus Cheilolejeunea.^ 

 Afterwards, however, he proposed that this genus should be defined in a narrower 



1 Mex. Leverm. 213. 1863. 



2 Jour. Linn. Soc. Bot. 30: 346. pl. 23, f. 6-8. 1894. 



3 Mem. Torrey Club 8: 147. 1902. 



