BY R. A. BASTOW, F.L.S. 223 



variety, similar to those observable in allied plants, 

 as A.falcata and P. retrospectans. The inflexion of 

 the dorsal margins of the leaves readily distinguishes 

 P. Magellanica from its allies ; the leaves themselves 

 vary in being patulous or appressed ; but their form is 

 the same in all the plants described as above and 

 referred to this species. (PI. iv.) 



In Lond. Jour. Bot., 1844, p. 457, P. unciformis is 

 described as with tufty stems a few inches wide, \ inch 

 high, erect, nearly simple, apex uncinate, leaves imbri- 

 cate, erect, secund, appressed, ovato-rotundate ; inferior 

 margin gibbous, denticulate ; upper incurved; base 

 almost nerved ; leaves increasing in size towards the 

 top; cells minute. Related to P. hiserialis, but not 

 above one-fourth the size, denticulations more minute, 

 not round and decurrent at the anterior margin, nor 

 strikingly flexuose, as in that species. 



Stems not more than | inch high, curved. 



5. P. pusiLLA, Mont.; Lind. Sp. Hep., p. 164. Stems 



short, curved. Leaves denticulate, anterior margins 

 not decurrent. 



This plant is larger than P. minutula, the shoots of 

 the latter being scarcely one-tenth of an inch high. 

 Lond. Jour. Bot., pp. 373 and 460. 



Tasmania, Hb., Montagne. Among Lepidozia 

 ulothrix, Hombron, (Voyage au Pole Sud, Crypt t. 

 16, f. 3). Among Chiloscyphus sinuosus, Mt. Wel- 

 lington, Gulliver. 



6. P. Stuartiana (Gottsche, in Linnsea, torn. 28, p. 548). 



Branches ascending, leaves obovate-cordate, apex 

 rotundo-obtuse, dorsal margin suberect, entire, ventral 

 margin arcuato-dentate. Near to P. ambigua, Lindbg. 

 and Hamp. in Linn., t. 24, p. 640. 

 Tasmania, Stuart. 



7. P. STRoMBiFOLiA, Tayl Stems creeping, 2-4in. high, 



vaguely branched, branches ascending. Leaves more 

 crowded and secund towards the top of the shoot, 

 imbricate, semi-ovate, convex, slightly obtuse, upper 

 margin shortly decurrent, ventral margin round, 

 sparingly and unequally dentate, dorsal margin denti- 

 culate or entire. Fruit in forks. Perianth ovate, 

 mouth dentate. ,/. Stromhifolia, Lond. Jour. Bot., 

 1844, p. 578. (PI. 3, f 1.) 



Resembles P. deltoidea in appearance, but its leaves 

 are less deltoid, and more of an ovate outline, and the 



