1966] 



LEAFY HEPATICAE OF LATIN AMERICA — PART II 



175 



It has also been reported from the following localities: Patagonia (Kiihnemann, 1949; 

 Stephani, 1900b, 1911) and Tierra del Fuego (Massalongo, 1885; Stephani, 1900b). 



The original material of this species was collected in South Island, New Zealand, at 

 Dusky Sound by Menzies (B). The species has an Antarctic distribution and occurs in the 

 Auckland Islands, New Zealand, and Tasmania in addition to the localities in South America. 



2. Acromastigum laetevirens (Sande LaCosta) Evans, Ann. Bryol. Suppl. 3: 



94. 1934. 



Mastigobryum laelevirens Sande LaCosta in Stephani, Hedwigia 25: 133. pi. 4- j. 4-6. 

 1886. 



Mastigobryum laetevirens Angstrom in Stephani, Spec. Hop. 3: 540. 1909. Icon. Hep., 

 Mastigobryum A T o. 4S7. 



Plants in depressed dingy green mats; stems to 10 mm long, with leaves 

 0.3 mm broad, the branching dichotomies 2.5-3 mm apart, the branches in 

 transverse section with seven large thick-walled cortical cells surrounding the 

 medulla of smaller cells. Rhizoids colorless, on the bases of the underleaves. Line 

 of leaf insertion oblique, the leaves incubous. Leaves imbricate, erect-spreading, 

 asymmetric, rectangular to ovate, deflexed above, 0.5-0.6 mm long, 0.25-0.3 mm 

 wide at the base, the apex equally or unequally bifid; dorsal segment triangular- 

 acute, eight to ten cells wide at the base, the ventral segment triangular but 

 usually four to six cells wide at the base; cells of the lamina below the segments 

 averaging 20 the walls thin, the trigones small, the cells near the base larger, 

 scarcely forming a vitta, the cuticle minutely verruculose or striolate-verruculose. 

 Underleaves approximate to broadly orbicular, subimbricate, appressed, 0.2-0.25 

 mm long, 0.25-0.3 mm wide, divided to the middle into three broad, rounded to 

 truncate lobes. Other parts not seen. PI. 38. Fig. 2, a-e. 



Habitat : Not given. 



CHILE: Corral, K. Krause (typeG). 



This species has also been reported from Hale Harbor (Stephani, 1911) and from 

 Valdivia (Herzog, 1960). 



3. Acromastigum cunninghamii (Stephani) Evans, Ann. Bryol. Suppl. 3: 



106./. 25. 1934. 



Bazzania cunninghamii Stephani, Hedwigia 32 : 205. 1893. 



Mastigobryum cunninghamii Stephani, Spec. Hep. 3 : 540. 1909; Icon. Hep.. Mastigobryum 

 No. 4S5. 



Plants pale, yellowish-green; stems 1-2 cm long, with leaves to 0.4 mm broad, 

 the leafy dichotomies 2-6 cm apart; ventral flagelliform branches few; branches 

 in transverse section with seven large, thick-walled cortical cells surrounding 

 the medulla of smaller cells. Rhizoids colorless, on the underleaves. Line of 

 leaf insertion oblique, the leaves incubous. Leaves imbricate, widely spreading, 

 asymmetric, ovate to rectangular, 0.4-0.5 mm long, 0.15-0.25 mm wide at the 

 base, unequally bifid for one-third to one-half of their length; dorsal segment 

 triangular, four to six cells wide at the base, the ventral segment slightly longer, 

 two cells wide nearly to the tip; cells of the lamina below the dorsal segment 

 averaging 16-20 /*xl8 n, the walls more or less uniformly thickened, the lumina 

 angular-rounded, a vitta of larger cells present in the ventral half of the lamina, 

 the cuticle smooth. Underleaves contiguous to subimbricate, appressed, orbicular- 

 quadrate, divided to the middle or beyond into three similar ligulate to ovate, 

 truncate segments. Sexual branches and sporophytes not seen. PI. 38. Fig. 3, a-c. 



Habitat: Not given. 



