1962] 



LEAFY HEPATICAE OP LATIN A M ERICA — 1'AKT I 



165 



Mastigobryum humifusm Stephani, Hedwigia 44: 225. 1905. 

 Mastigobryum heterocladum Stephani, Spec. Hep. 3: 502. 1908. 

 Mastigobryum spinigerum Stephani, Spec. Hep. 3: 500. 1908. 

 Bazzania conchophylla Herzog, Rev. Bryol. Lichenol. 11: 20. 1938. 



Mastigobryum incisostipulum Stephani in Herzog, Biblioth. Bot. 87: 225. /. 165, c-d. 1916. 



Plants of medium size, greenish-brown becoming deeply pigmented with 

 brown; stems to 8 cm long, with leaves to 3.2 mm broad, suberect; lateral 

 branehes 5 mm or more apart, diverging at a wide angle; flagelliform branches 

 frequent, the scale-leaves small, not as broad as the branch. Leaves approximate 

 to imbricate, deflexed, strongly so when dry, asymmetrically ovate, straight to 

 subfalcate. 1.2-2.2 mm long, to 1 mm broad at the base, narrowed to the more 

 or less obliquely truncate, tridentate apex, the dorsal margin strongly arched 

 from a cordate base, the ventral auricle undulate, entire, toothed, ciliate or ap- 

 pendiculate ; teeth mostly spreading, acute, five to eight cells long, four to six 

 cells broad at the base, the margins entire; leaf-cells thin-walled, the cell lumina 

 angular-rounded, the trigones conspicuous, with convex sides, often confluent, 

 the cuticle faintly verruculose ; cells of the apical region averaging 20 X 20 p. 

 Underleaves approximate to imbricate, subquadrate in outline, averaging 0.7 

 mm long and broad, the base cordate, the auricles rather small, not overlapping, 

 rounded, their margins entire or dentate with one or two broad teeth, or ciliate 

 by a row of two or three cells, the lateral margins convex, entire or rarely with 

 one or two teeth, the apex deeply four-lobed or -toothed, with narrow, acute 

 sinuses. Female branches occasional, the bracts of the intermediate and inner- 

 most series long-ovate, divided to one-fifth or one-sixth their length into three, 

 serrate, ciliate laciniae, the cells mostly 36 X 16 p., the cell walls thin. Male 

 branches, perianths, and sporophytes not seen. Fig. 47, a-h. 



Habitat : On rocks and bases of trees on shaded slopes in moist forests. 



MEXICO: Vera Cruz, Hacienda de Mirador, Liebmann, (type G) ; s.l., Karsten 94 (as 

 M. portorkense) (Or); s.l., Sumichrast (G) ; Chiapas: near Mapastepec, Sharp 4558 p.p. 

 (TENN). 



COSTA RICA: La Estrella, Standley 39426 (US); San Jose, Standley 41639 (US); 

 Cartago, Standley 50, 884 (US). 



COLOMBIA: Cordillera Macarena Schultes # Bell 11655 (FH). 



VENEZUELA: Cerro Huachamacare, Maguire, Cowan # Wurdack 30270 (NY). 



BRAZIL: Rio Taruma at the Rio Negro, Spruce, Hep. Sprue., type of B. spinigera (iso- 

 type NY); s.l., Ule 140 (as M. portoricense) (G) ; Rio de Janeiro, Schiffner 836 (W). S. 

 Paulo: near Itapeeerica, Schiffner 1264 p.p. (W) ; Alto da Serra, Schiffner 1706 (W); near 

 Santos, Schiffner 1939 p.p., 1953 (W). 



PERU: Mt. Guayiapurina, Spruce, Hep. Sprue., type of B. heteroclada (isotype NY) ; Mt. 

 Campana, Spruce, Hep. Sprue, type of B. humifusa (isotype NY), Spruce (as M. teretiusculum 

 and B. otites) (G). 



Fio. 47. Bazzania teretiuscula. 47 a. Stem, ventral view, X 15. 47 b. Another stem, 

 X 15. 47 c. Leaf, X 15- 47 d. Ventral auricles of three leaves, X 30 - 47 e - Leaf-cell, X 

 400. 47 f . Underleaf, X 15. 47 g. Female bract of the intermediate series, X 30. 47 h. La- 

 cinia of a bract of the innermost series, X 100. 



Fig. 48. B. acanthostipa. 48 a. Stem, ventral view, X 15- 48 b. Ventral auricle of a 

 leaf, X 30. 48 c. Leaf-cell, X 400. 48 d. Underleaf, X 15. 48 e. Female bract of the inner- 

 most series, X 30. 48 f . Portion of the perianth-mouth, X 90. 



Fig. 49. B. canelensis. 49 a. Stem, ventral view, X 15. 49 b. Leaf insertion, X 15. 

 49 c. Leaf -cell, X 400. 



Fig. 50. B. placophylla. 50 a. Stem, ventral view, X 15. 50 b. Leaf and stem, dorsal 

 view, X 15. 50 c. Ventral auricles of two leaves, X 40. 50 d. Leaf-cell, X 350. 50 e. Base 

 of an underleaf, X 40. 



