THE THALLOSE HEl'ATICAE OF THE JUAN FERNANDEZ ISLANDS 557 



marginal wing with a wavy edge is present at the periphery of the spherical 

 face, and the latter bears a series of low flat ridges sometimes forming a vague 

 reticulum. 



Male receptacles are not present in the American material, but the New 

 Zealand specimens illustrate their characteristics. The stalks are about i cm. 

 high and are destitute of green tissue with air-chambers. When well-developed 

 the disc is about 0.5 cm. across and shows eight blunt lobes separated by 

 shallow sinuses. When poorly developed the lobes are often very indistinct. 



The margins of the cupules are rather closely dentate to short-ciliate, the 

 teeth varying from one to eight cells in length and from one to three cells in 

 width at the base. In the apical portion on the outer surface a few scattered 

 teeth are sometimes present but the surface is otherwise smooth. 



Probably the closest all)- o{ J\I. foliacca is the widely distributed M. paleacea 

 Bertol. of the Northern Hemisphere. The two species are very distinct, how- 

 ever, in their cupules and involucres. In M. paleacea both of these organs are 

 deeply lobed and the lobes bear teeth or cilia, giving the effect of pinnate 

 structures; in M. foliacea the cupules and involucres are toothed or ciliate but 

 the lobes, even if present at all, are vague and a definitely pinnate appearance 

 is not produced. On the whole J/, foliacea is a little more robust than 7l/. 

 paleacea, and the epidermal pores, although built up on the same cruciate type, 

 tend to be slightly larger and to show more cells in the innermost row of the 

 outer series. 



Whether Lehmann's M. Notarisii is actually a synonym of M. foliacea 

 is doubtful. The published descriptions would hardly lead to this conclusion; 

 they point rather to M. cJienopoda L. At the same time the descriptions are 

 not altogether decisive, and the only way in which the question could be de- 

 finitely answered would be by the study of Lehmann's original specimens. 



Area of distribution: New Zealand and Tasmania; Chiloe and Juan 

 Fernandez. 



J u n g e r m a n n i a 1 e s . 



Riccardiaceae. 



Riccardia S. F. Gray. 



*7. R. fuegiensis Massal. Nuovo Gior. Bot. Ital. 17: 255 pi. 26 f. 34 

 (1885); EVAN.S, Trans. Connecticut Acad. 25: 113 (1921). 

 Alpine heath, among grasses. 



Masafuera: the High Plateau, iioo m., mixed with other bryophytes 

 (no. 20). 



The determination is based on a few scattered stems, but these show 

 ventral lamellae and are therefore referred to R. fuegie^isis, the only species in 

 which these structures have as yet been described. Unfortunately the material 

 from Masafuera is less robust than typical Chilean plants, the margins of the 



