54 PATAGONIAN EXPEDITIONS : BOTANY. 



of Leioscyphus (e. g., L. chiloscyphoideus] with alternate leaves ; and the 

 second distinction seems hardly sufficient to separate the genera. 







42. MYLIA CHILOSCYPHOIDEA (Lindenb.). 



Plagiochila chiloscyphoidea Lindenb. in Lehmann, Pugillus, 8: 4. 1844. 

 Leioscyphus chiloscyphoideiis Mitt. Fl. Tasmaniae, 2: 225. 1860. 

 Fuegia. 







43. PIGAFETTOA CRENULATA Massal. Nuovo Gior. Bot. Ital. 17: 237. 



PI. 21. f. 2 3 . 1885. 



Villarino Bay. (By Savatier in W. Patagonia.) 



44. PLAGIOCHILA ANSATA Hook. f. & Tayl. in G. L. & N. Syn. Hep. 



649. 1847. 



PI. VI, Figs. 1-9. 



Jungermannia ansata Hook. f. & Tayl. Lond. Jour. Bot. 3: 457. 1844. 

 Plagiochila circinalis var. Besch. & Massal. Bull. Soc. Linn, de Paris, 627. 

 1886. 



Dioicous : plants growing in loose tufts, blackish-brown varying to pale 

 brown or yellowish-green : stems simple or sparingly branched, some- 

 times 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 polyg- 

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

 conspicuous, separated by narrow thin-walled regions or pits : ? inflores- 

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

 into the stem-leaves, the margins coarsely and irregularly dentate with 1-5 

 sharp teeth or blunt projections, innermost bracts narrower than the 

 others, ovate or obovate in shape ; perianth long-exserted, flattened, ex- 

 alate, clavate, very gradually narrowed 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. long, 

 1.4 mm. wide ; leaf-cells on edge of leaf 25 JJL, in the middle 29 p, and at 



