JUNGEKMANNIACEAE. 515 



obovoid, sometimes compressed, with from four to ten rounded keels without 

 wings or teeth. [Greek, armed Lejeunea.] About 65 species, mostly tropical. 

 Type species: B. laxifolia (Tayl.) Schiffn. 



Autoecious ; perianth ten-keeled. 1. B. bahamensis. 



Dioecious ; perianth five- to seven-keeled. 2. B. corticalis. 



1. Brachiolejeunea bahamensis Evans, Bull. Torr. Club 35: 383. 1908. 



Dull green, varying to brown or almost black, scattered or growing in 

 depressed mats. Dorsal lobe of leaves convolute about the stem when dry, 

 squarrose when moist, about 0.9 mm. long; lobule usually with five or six 

 teeth, each usually three or four cells long; leaf-cells averaging about 25 X 18 ^t; 

 underleaves broadly orbicular, rounded at base; inflorescence autoecious; male 

 bracts in from three to ten pairs, the androecium often proliferating; female 

 inflorescence usually with two innovations; bracts winged, the lobule obtuse, 

 acute, or apiculate. Perianth with ten rounded keels, scarcely compressed. 



On bark, Abaco, New Providence, Watling's and Crooked Islands : Florida ; 

 Cuba ; Porto Rico. BAHAMIAN BRACHIOLEJE.UNEA. 



2. Brachiolejeunea corticalis (Lehm. & Lindenb.) Schiffn.; Evans, Mem. Torr. 



Club 8: 131. 1902. 



Jungermannia corticalis Lehm. & Lindenb. Pug. 4: 50. 1832. 



Very similar in appearance to B. "bahamensis. Lobule usually with only 

 four teeth, each only one or two cells long; underleaves cuneate at base; in- 

 florescence dioecious; lobule of female bracts rounded; perianth with five to 

 eight keels. 



On bark, Great Bahama and Cat Island : Florida ; tropical America. BARK 

 BRACHIOLEJEUNEA. 



14. LOPHOLEJEUNEA [Spruce] Schiffn. in E. & P. Nat. 

 Pflf. I 3 : 129. 1894. 



Plants prostrate, usually dark brown or almost black, rarely olive green, 

 often glossy, medium-sized, irregularly branched, the branches as in Eadula. 

 Leaves complicate-bilobed, the dorsal lobe not squarrose when moist, often 

 revolute at the rounded or bluntly pointed apex, entire except in the vicinity 

 of the female inflorescence; lobule inflated along the keel, the margin not invo- 

 lute, the apical tooth usually represented by a blunt, slightly projecting cell, 

 with the hyaline papilla near its proximal base; leaf -cells with distinct tri- 

 gones or apparently uniformly thickened. Underleaves plane, orbicular to reni- 

 form, undivided. Antheridia borne in pairs in the axils of saccate bracts, the 

 androecia more or less elongated, with the bracteoles everywhere present. 

 Female inflorescence borne on a more or less elongated branch, without sub- 

 floral innovations; bracts more or less strongly toothed, the lobule much smaller 

 than the lobe and sometimes reduced to a minute basal tooth; bracteole usually 

 undivided but sometimes toothed. Perianth strongly compressed with two sharp 

 ventral keels, the keels with toothed or laciniate wings. [Greek, crested 

 Lejeunea.'] About 70 species, mostly tropical. Type species: L. Sagraeana 

 (Mont.) Schiffn. 



