510 JUNGERMANNIACEAE. 



Loaves with basal ocelli : caducous leaves borne on short spread- 

 ing branches with crowded persistent underleaves and limited 



growth. 1. R. Bertcroana. 



Leaves without basal ocelli ; caducous leaves borne on ordinary 



branches. 

 Dioecious : bracteoles present along the whole length of the 



androecia. -. R- Brittoniae. 



Autoecious ; bracteoles restricted to the base of the androecia. 3. R. phyllobola. 



1. Kectolejeunea Berteroana (Gottsche) Evans, Bull. Torr. Club 33: 12. 1906. 



Lejeunea Berteroana Gottsche; Steph. Hedwigia 27: 282. 1888. 



Pale green, scattered or in depressed tufts. Leaves imbricated, the dorsal 

 lobe widely spreading, plane or nearly so, obliquely ovate, about 0.5 mm. long, 

 rounded at the apex; lobule inflated, ovoid-cylindrical, involute, apex tipped 

 with uniformly thickened walls, averaging about 10,u,; basal ocelli much larger, 

 usually occurring in groups of two to six; underleaves normally contiguous, 

 orbicular, plane, bifid about half way with acute lobes and sinus; inflorescence 

 dioecious ; female inflorescence borne on a short branch with a single subfloral 

 innovation; bracts with plane lobules, otherwise much like the leaves; perianth 

 unknown; caducous leaves borne on short spreading branches with crowded 

 persistent underleaves and limited growth. 



On bark, Soldier's Road and Grantstown, New Providence : Florida ; West In- 

 dies. BERTERO'S RECTOLEJE.UNEA. 



2. Eectolejeunea Brittoniae Evans, Bull. Torr. Club 38; 209. 1911. 



Yellowish green, growing in depressed mats. Leaves imbricated, the dorsal 

 lobe widely spreading, plane or nearly so, broadly ovate to orbicular, about 0.5 

 mm. long, rounded at the apex, margin vaguely crenulate; lobule inflated, 

 triangular-ovoid, involute, apex tipped with a straight, slightly projecting cell; 

 leaf cells with indistinct trigones, averaging about 25 /j. in the middle of the 

 lobe; underleaves scarcely overlapping, orbicular, bifid about one half with 

 sharp or blunt lobes; inflorescence dioecious; male inflorescence variable in 

 length, the bracteoles present throughout and similar to the underleaves ; female 

 inflorescence usually on an elongated branch, with one or two subfloral inno- 

 vations; bracts and braeteoles a little larger than the leaves; perianth oblong 

 to obovate; caducous leaves borne on prastrate branches. 



On bark, Great Bahama and New Providence : Florida ; Cuba ; Hispaniola. 

 MRS. BRITTON'S RECTOLEJECXEA. 



3. Eectolejeunea phyllobola (Nees Mont.) Evans, Bull. Torr. Club 33: 15. 



Lejeunea phyllobola Xees & Mont, in Sagra, Hist. Cub. 9: 281. 1845. 



Pale green, growing in depressed mats. Leaves loosely imbricated, the 

 dorsal lobe widely spreading, ovate-orbicular, about 0.5 mm. long, rounded at 

 the apex, entire or nearly so; lobule inflated, ovate, involute, apex usually 

 tipped with a single rounded cell; leaf cells thin-walled but with distinct tri- 

 gones, averaging about 20,u.; underleaves distant, broadly ovate to orbicular, 

 bifid to about the middle with narrow and usually sharp divisions ; inflorescence 

 autoecious; male inflorescence with the bracteoles restricted to the basal por- 

 tion; female inflorescence usually borne on a short branch with a single sub- 

 floral innovation; bracts, bracteoles and perianths much as in the preceding 

 species; caducous leaves borne on prostrate branches. 



On bark. Great Bahama, New Providence, Cat and Watling's Islands : Florida ; 

 Bermuda : West Indies. LEAF-SHEDDIXG RECTOLEJEUXEA. 



8. CHEILOLEJEUNEA [Spruce] Schiffn. in E. & P. Nat. 

 Pflf. I 3 : 124. 1894. 



Stems prostrate, small or medium-sized, irregularly branched, the branches 

 as in Eadula; rhizoids springing from the bases of the underleaves. Leaves 



