CHEILOLEJEUNEA PHYLLOBOLA 143 
bracts. From the second it differs more particularly in its larger 
size and in its much larger underleaves, which are rounded or sub- 
cordate at the base. 
IO. CHEILOLEJEUNEA PHYLLOBOLA (Nees & Mont.) Schiffn. 
PLATE 20, Fics. 1-13 
Lejeunea phyllobola Nees & Mont.; Ramon de la Sagra, Hist. 
fis. pol. y natur. Cuba, 9: 281. ras: Ax L N. Syn. Hep. 
369. 1845. 
Lejeunea (Hygro-Lejeunea) phyllobola Steph. Hedwigia, 29: 
81. 18090. 
Chetlolejcunea phyllobola Schiffn. Engler's Bot. Jahrb. 23: 591. 
1897. 
Hygrolejeunea phyllobola Massal. Mem. dell’ Accad. di Verona, 
73:—(33). Pl. 9. f. 12. 1897. 
ale green, growing in depressed mats: stems prostrate, 
closely appressed to substratum, 0.07 mm. in diameter, irregularly 
and rather densely pinnate, the branches sometimes upright and 
flagelliform, leafless except at apex, but with well-developed un- 
derleaves: rhizoids somewhat abundant: leaves loosely imbri- 
cated, the lobe obliquely to widely spreading, orbicular-ovate, 
0.5 mm. long, 0.45 mm. wide, rounded at the apex, margin entire 
or very slightly and irregularly sinuate from projecting cells, 
antical margin arching across axis, but almost straight near base, 
postical margin straight or slightly curved, forming a very obtuse 
angle with keel; lobule inflated, ovate, 0.1 mm. long, 0.07 mm. 
wide, keel almost straight, free margin involute to or just beyond 
apex, then obliquely truncate to end of keel, apex usually tipped 
with a single rounded cell, sometimes acute or even ending in a row 
of two or three cells, lobule often rudimentary and explanate ; cells 
of lobe slightly convex, thin-walled, but with distinct trigones and 
occasional intermediate thickenings, the latter sometimes very 
crenulate, rarely with an angular tooth near the middle of one or 
both sides: inflorescence autoicous : 9 inflorescence usually borne 
