1968] 



LEAFY HEPATICAE OF LATIN AMERICA PART III 



337 



branched, the branches ventral, leafy, leafy becoming flagelliform, flagelliform stolon- 

 like, or very short sexual. Rhizoids abundant on the underside of the stem. Line 

 of leaf insertion oblique, nearly longitudinal. Leaves widely spreading, plane through- 

 out, subrectangular, the margin straight, the apex broad truncate, rarely retuse; cells 

 of the upper part of the leaf subquadrate in outline, mostly 20 X 20 /x, the walls 

 uniformly thickened, the trigones very small to conspicuous, the cuticle verruculose; 

 marginal cells smaller, 15 X 15 n, with thicker walls. Underleaves rudimentary, of 

 only a few cells. Plants dioicous. Male inflorescence short ventral, whitish, catkin- 

 like, the bracts in 5-10 series, small, bifid, concave. Female inflorescence on a 

 short ventral branch, the bracts and bracteoles in 3 series, bifid, the segments short- 

 triangular, the margins with short projecting cells. Perianth long, cylindrical below, 

 3-keeled above, the mouth contracted, crenulate with a few short cilia. Gemmae 

 2-celled, green, at the tips of erect small-leaved stems. 



PI. 86. Fig. 1, a-c. 



Habitat: On decaying logs. 



CUBA: Oriente: Sierra Maestra, 1000+ m, Yuncker 12598 p.p. (DPU) ; Isle of Pines: si, 

 L. N. & E. G. Britton & Wilson 14779 (NY). 



JAMAICA: si or without coll., Hb Lehmann misit Taylor (2) (type S-PA). 



PUERTO RICO: si, Heller 1148 (NY), 4749 (MO); Maricos, Steere 5817 (Hb Fulford) ; 

 Mt. Britton, Fulford, Crandall & Stotler 651, 653 p.p. (Hb Fulford); Pico del Oesta 1020 m, 

 Fulford, Crandall & Stotler 409 p.p. (Hb Fulford). 



GUADELOUPE: bois de Baines Jaunes, Le Gallo 285, 289 (Hb Le Gallo). 



DOMINICA: si, Elliott, Hep. Dom. Elliot, type of O. planifolium (BM, G-13235) ; si, 

 Elliott 1146 (G-13236), 2136 (G-13237) ; Morne Diablotin, Elliott 2120 p.p. (BM) ; Lagona Flats, 

 Elliott 2136 (BM); Four Hunt, Fishlock 12, 16b (NY); Picard Valley, Elliott 940, 961 (BM) ; 

 sl or without coll. (STR). 



COLOMBIA: Intendencia del Meta: Cordillera La Macarena, quebrada Tiranas, 1700 m, 

 Schultes & Bell 11672 (FH). 



VENEZUELA: Choroni Pass, 159S m, Fulford & Steyermark 1126 p.p. (Hb Fulford); 

 Bolivar: Cerro Venamo, Sur Oeste, 1400-1575 m, Steyermark & Dunsterville 92555 p.p. (VEN) ; 

 Valencia, Fendler (G-13250). 



BRAZIL: Central Goias, Dawson 14315 p.p. (Hb Fulford); Rio de Janeiro, Glaziou 7231, 

 type of O. glaziovii (G-13232, isotypes C, NY, S-PA); Itatiaia, Maromba River, 1100+ m, 

 Fulford, Hatcher, Hell & Vital, 766 p.p. (Hb Fulford); Caraqa, Wainio (BM) ; S. Paulo: "Brasso 

 Grande," Schiffner 1288 (S-PA, UPS). 



ECUADOR: Azuay: Rio Collay, s of El Pan, 2650-3290 m, Steyermark 53364 p.p. (F). 



2. Odontoschisma prostratum (Swartz) Trevisan, Mem. 1st. Lomb. III. 4: 419. 

 1877. 6 



Jungermannia prostrata Swartz, Prodr. Fl. Ind. Occid. 142. 1788. 

 Sphagnoecetis prostrata a Nees in G. L. & N. Syn. Hep. 149. 1845. 

 Pleuroschisma prostratum Mitten, Jour. Linn. Soc. Bot. 15: 61. 1877. 



Plants of small to medium size, pale green becoming brownish, rarely reddish, 

 prostrate with some ascending tips, in mats or creeping among other bryophytes; 

 stems to 3 cm or more long, with leaves to 1.5 mm wide, sparingly branched; branches 

 ventral-intercalary, leafy or flagelliform (stolon-like) or short sexual. Rhizoids 

 abundant over the ventral side of the stem. Leaf insertion oblique. Leaves widely 

 spreading or the rows often folded against one another, distant to imbricate, orbicular 

 to oblong, 0.7-1.0 mm long, 0.3-0.5 mm wide, somewhat concave, with a conspicu- 

 ous border of elongate cells forming an upturned edge, the apex rounded, or rarely 

 emarginate, the margin entire; cells of the marginal 1-4 rows small, 13-20 X 13 ^, 

 with uniformly thickened walls, cells of the upper part of the leaf 13-18 X 13 fi, 



See a manual of the North American species for a more complete synonymy. 



