Three South American species of Asterella* 
ALEXANDER W. Evans 
The genus A sterella has many representatives on the American 
continent. Most of the northern species are widely distributed, 
but the southern and tropical species tend to be more restricted 
in range. Of the fifteen North American species recognized by 
the writer in his recent revisionf only two are known to extend 
into South America. These are A. venosa, which was based on 
material from Brazil, and A. lateralis, which Spruce collected in 
Ecuador. No other South American stations for either species 
have been recorded. In the present paper three species which 
are not known to extend into North Americaare discussed. Four 
other South American species have been described by Stephani 
in his Species Hepaticarum, but no material of these is available 
at the present time. 
1. Asterella chilensis (Mont.) comb. nov. 
Fimbriaria chilensis Nees & Mont.; Montagne, Ann. Sci. Nat. 
Bot. II. 9: 41. 1838. 
Hypenantron chilense Trevis. Men. R. Ist. Lomb. III. 4: 441. 1877. 
Thallus green, becoming brownish or purplish with age, the 
ventral scales usually more deeply pigmented, mostly 0.5~1 cm. 
long and 1.5-2.5 mm. wide, in fertile branches broadening out 
somewhat at the apex, plane or somewhat concave, the thin and 
slightly wavy margins not incurved when dry, branching normally 
by forking, ena ey (according to published descriptions) 
innovating at the apex, keel broad and rounded; epidermis com- 
posed of cells with toh ity thickened walls, sometimes with more 
or less evident trigones, averaging about 35 x 25 uw; pores slightly 

* Contribution from the Osborn Botanical Laboratory. 
.? The North American species of Asterella. Contr. U. S. Nat. Herb. 20: 247- 
312. 1919. In this paper full descriptions may be found of the following species 
referred toin the present article: A, elegans (Spreng.) Trevis., A. lateralis M. A. 
Howe, A. Lindenbergiana (Corda) Lindb., A. Ludwigii (Schwaegr.) Underw., A. 
tenella (L.) Beauv., and A. venosa (Lehm. & Lindenb.) Evans. 
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