1968] 



LEAFY HEPATICAE OF LATIN AMERICA — PART III 



327 



or rose-purple, prostrate, in mats or creeping among other bryophytes. Stems 1-2 

 cm long, with leaves 0.3-0.8 mm wide, occasionally branched; branches lateral, of 

 the Frullania type, or ventral-intercalary, leafy, the ventral branches sometimes short 

 bearing a female inflorescence; stem in transverse section with a cortical layer of 

 6-8 rows of large thick-walled cells surrounding about 6 smaller cells. Rhizoids 

 from the ventral surface of the stem and the lower part of the female inflorescence. 

 Line of leaf insertion short, nearly transverse. Leaves bilobed, the segments trian- 

 gular, ending in a short to long uniseriate, capillary point, dorsal margin of the lamina 

 convex from a straight base, entire or with several teeth, the sinus broad V-shaped 

 to lunulate, entire or with several teeth, the ventral margin with a large inrolled 

 inflated sac. Underleaves absent. Plants monoicous or dioicous. Male inflorescence 

 terminal becoming intercalary on the stem or a branch, the bracts bifid, without a 

 ventral sac, bracteoles absent. Female inflorescence on a very short ventral-inter- 

 calary branch, the bracts and bracteoles long-ovate, keeled, bifid, serrate. Perianth 

 long, 3-keeled above, the mouth broad, crenulate, toothed or short-ciliate. Shoot- 

 sporophyte relationship a shoot-calyptra. Capsule brownish, ovoid, the wall 2-lay- 

 ered, with characteristic wall thickenings; seta in transverse section of 8 large outer 

 cells surrounding 4 inner cells. Spores light brown. Sporeling protonema filamentous, 

 of the Cephalozia type. Gemmae 1-celled, in chains from the tips of leaves. 

 Type species: Jungcnnannia curvijolia Dickson, 1790. 



Key to the Species 



1. Dorsal margin and sinus of the leaf entire, without projections. 



2. Leaf segments short, the tip only a few cells (1-3) long. 2. N. yunckeri. 

 2. Leaf segments long, the tip 4-7 cells long. 



3. Cells of the segments mostly subquadrate ; sinus bordered by similar cells. 



1. N. curvijolia. 



3. Cells of the segment mostly long-rectangular; sinus bordered by 1 or 2 rows of 



similar long cells parallel to the margin. 3. N. caribbeania. 

 1. Dorsal margin and sinus of the leaf spinose or toothed. 



2. Spines numerous, sharp, long, mostly 2-celled. S. N. wrightii. 



2. Teeth few, of one blunt cell. 4. N. bicornis. 



1. Nowellia curvifolia (Dickson) Mitten in Godman, Nat. Hist. Azores 321. 

 1870. 



Jungermannia curvifolia Dickson, PI. Crypt. Fasc. 2: 15. 1790. 

 Jungermannia Baueri Martius, Fl.Crypt. Erlangensis 172. 1817. 

 Cephalozia curvifolia Dumortier, Recueil Obs. Jungerm. 18. 183S. 

 Trigonanthus atrvifolius Spruce in Hartman, Skand. Bl. ed. X. 143. 1871. 



Plants small, chain-like, whitish-green of yellow-green becoming red or rosy 

 purple, in mats or creeping among other bryophytes. Stems slender, 1-2 cm long, 

 with leaves to 0.4 mm wide, occasionally branched; branches lateral, of the Frullania 

 type or ventral-intercalary, leafy, the ventral branches often short, bearing a female 

 inflorescence. Rhizoids long, slender, colorless, from cells of the ventral side of the 

 stem. Line of leaf insertion short, nearly transverse. Leaves broadly obovate, 

 bilobed to one-half their length, concave with the outer part curved upward, imbri- 

 cate, the segments long-triangular from a base 5-8 cells wide and ending in as erect 

 or curved, uniseriate 5- to 7-celled tip, the dorsal margin convex from a straight base, 

 the ventral margin with a large sac, the sinus usually broad V-shaped; cells of the 

 leaf tip 30-39 X 13-20 n, cells of the segment mostly quadrate, 20-25 fx, rarely to 

 30 X 20-25 fi, the walls uniformly thickened, without distinct trigones, the cuticle 

 essentially smooth. Underleaves absent. Plants monoicous and dioicous. Male in- 



