﻿Evans : Hepaticae of Southern Patagonia 427 



44. Plagiochila ansata Hook. f. &Tayl. in G. L.& N. Syn. Hep. 



649. 1847. [Plate 347.] 

 Jungermannia ansata Hook. f. & Tayl. Lond. Jour. Bot. 3 : 



457- 1844. 



Plagiochila circiualis var. Besch. & Massal. Bull. Soc. Linn, de 



Paris, 627. 1886. 



Dioicous : plants growing in loose tufts, blackish-brown vary- 

 ing to pale brown or yellowish-green : stems simple or sparingly 

 branched, sometimes innovating from below the perianth, slightly 

 or not at all radiculose : leaves distant or subimbricated, erect- 

 spreading or erect and appressed to the stem, orbicular-obovate, 

 rounded at the broad apex, cuneate at the base, margin entire or 

 repand, the antical decurrent, the postical rounded near the base 

 and less decurrent : underleaves wanting : leaf-cells polygonal 

 (mostly 6-sided), becoming elongated toward base, trigones very 

 conspicuous, separated by narrow thin-walled regions or pits : 2 in- 

 florescence terminal, the bracts in 2 or 3 pairs, passing by gradual 

 transitions into the stem-leaves, the margins coarsely and irregu- 

 larly dentate with 1-5 sharp teeth or blunt projections, innermost 

 bracts narrower than the others, ovate or obovate in shape ; peri- 

 anth long-exserted, flattened, exalate, clavate, very gradually nar- 

 rowed toward the base and truncate at the apex, mouth bilabiate, 

 ciliate-dentate, perianth 2 cells thick except close to the base where 

 it is 3 cells and near the mouth where it is only one cell. 



Stem 5 cm. or more long, 0.25 mm. in diameter ; leaves 1.5 mm. 

 Jong, 1. 4 mm. w i de . leaf-cells on edge of leaf 25 ft, in the middle 

 2 9 ! l and at the base 53 ft x 29 p. ; bracts of innermost row 1 . 5 mm. 

 X 0.95 mm. and 1.7 mm. x 1.35 mm., perianth 4 mm. long, 1.2 

 mm. wide. 



Villarina Bay. 



Plagiochila ansata is a species of wide distribution in southern 

 regions, having been reported also from the Falkland Islands and 

 from New Zealand. The type specimens from the first of these 

 localities agree closely with the Fuegian plants ; but, as the pub- 

 lished descriptions and figures of the species are somewhat inade- 

 quate, it has seemed advisable to describe and figure it anew. The 

 description given above is drawn from robust stems, particularly 

 those bearing perianths ; sterile stems and the branches and inno- 

 vations of fertile plants are sometimes much more slender and bear 

 scattered and smaller leaves. Even in the most slender forms, 

 however, the characteristic leaf-cells with their well-developed 



