1962] 



LEAFY HEPATICAE OF LATIN AMERICA — I'AKT I 



1 35 



apical margins of the underleaves with a few hyaline cells, and the more or less 

 serrate margins of the teeth of the leaves. 



19. Bazzania acuminata (Lindenberg & Gottsche) Trevisan, Mem. 1st. Lomb. 



13: 414. 1877. 



Mastigobryum acuminatum Lindenberg & Gottsche in G. L. & N. Syn. Hep. 719. 1847. 

 Mastigobryum orizabense Gottsche, Mex. Leberm. 130. 1863. 

 Mastigobryum miillerianum Gottsche, Mex. Leberm. 129. 1863. 



Plants of medium size, olive-green, deeply pigmented with brown; stems to 

 5 cm long, with leaves to 2.5 or 3 mm broad; lateral branches frequent, diverg- 

 ing at an acute angle; flagelliform branches frequent, long. Line of leaf inser- 

 tion curved in its upper half, the dorsal end curved downward, forming a short 

 hook. Leaves distant to imbricate, spreading, strongly deflexed when dry. asym- 

 metrically and broadly ovate, 1.5-2.0 mm long, 0.8-1 mm broad at the base, 

 narrowed to the usually obliquely truncate, unequally tridentate apex; teeth 

 acute, two to five cells long and broad, the sinuses lunulate, the margins entire ; 

 leaf-cells thin-walled, the trigones conspicuous, with bulging sides, sometimes 

 coalesced, the lumina angular-rounded, the cuticle verrueulose ; cells of the apical 

 region 18 X 18 /i. Underleaves distant to approximate, orbicular, broader than 

 the stem, 0.50-0.56 mm long, 0.45-0.52 mm broad, the lateral margins entire, 

 strongly recurved, the apex entire, emarginate, undulate. Sexual branches not 

 seen. Fig. 19, a-e. 



Habitat : Not given. 



MEXICO: Oaxaca, Liebmann 176b (type G) ; Vera Cruz: Orizaba, Mutter 159, type of 

 M. orizabense (G) ; Mutter 2861, type of M. miillerianum (NY); Chiapas: Mapastepec, Sharp 

 4558 (TENN). 



VENEZUELA: Caracas, Burchel (NY). 



20. Bazzania diversicuspis Spruce, Trans. Proc. Bot, Soc. Edinb. 15: 373. 1885. 



Mastigobryum diversicuspe Stephani, Spec. Hep. 3: 432. 1908. 



Mastigobryum venezuelanum Stephani, Spec. Hep. 3: 530. 1909. Non M. venezuelanum 

 Molkenboer in Sande-Lacosta. 



Plants delicate, dull green to light brown ; stems slender, to 4 or 5 cm long, 

 with leaves to 3 mm broad, prostrate ; lateral branches 1 cm or more apart, 

 diverging at a wide angle; flagelliform branches frequent, long. Leaf insertion 

 little curved in the upper part. Leaves spreading to ascendent, approximate to 

 imbricate, straight, asymmetrically ovate, to 1 mm long, 0.48 mm broad at the 

 base, narrowed somewhat to the acute, rounded-acute, or transversely truncate, 



Fig. 19. Bazzania acuminata. 19 a. Stem, ventral view, X 30. 19 b. Stem and leaf, 

 dorsal view, X 15- 19 c. Apices of leaves, X 30. 19 d. Leaf -cell, X 350. 19 e. Underleaf, 

 X30. 



Fig. 20. B. diversicuspis. 20 a. Stem, ventral view, X 15. 20 b. Leaf -cell, X 350. 



Fig. 21. B. tricuspidata. 21 a. Stem, ventral view, X 15. 21 b. Leaf, X 30. 21 c. 

 Leaf -cell, X 400. 21 d. Underleaf. 



Fig. 22. B. longistipula. 22 a. Stem, ventral view, X 12. 22b. Leaf, X 30. 22 c. Leaf - 

 cell, X 350. 22 d. Underleaf, X 30. 22 e. Another stem, ventral view, X 12. 22 f . Another 

 stem, ventral view, X 15. 22 g. A female bract of the innermost series (immature), X 30. 

 22b. Portion of the perianth-mouth, X 260. 



Fig. 23. B. tricrenata. 23 a, b. Stems, ventral view, X 30. 23 c. Leaf -cell, X 350. 



Fig. 24. B. latidens. 24 a. Stem, ventral view, X 15- 24 b. Leaf -cell, X 400. 24 c. 

 Underleaf, X 30. 



