8 4 



PATAGONIAN EXPEDITIONS I BOTANY. 



robustiusculis, strictis parallele confertis, usque ad 3.5 cm. altis, iterum 

 iterumque bifurcatis vel apice saltern fasciculatim et fastigiatim ramulosis ; 

 folia dense conferta, usque ad 2.4 mm. longa et 0.45 mm. lata, siccitate 

 appressa, suprema subspiraliter torta, humiditate patula, imbricata, stricta, 

 lanceolata, acutissima, integerrima, baud decurrentia, carinata, plerumque 

 utroque latere subplane replicata, marginibus planis vel rare subreflexis, 

 nervo rubro, valido, basi 0.06 mm. crasso, laevissimo, cum apice desinente ; 

 cellulae laevissimae, parietibus valde incrassatis, basales rectangular, apicales 

 minutissimae, 0.005-0.008 mm. magnae, omnino hexagonae ; cetera ignota. 



FIG. 12. 



a b c 



Macromitrium bifasciculare C. Mull, a, folia, -Ijl ; b, cellulse apicales, ^|^ ; c, sectiones foliorum, &-. 



' Hab. Fuegia australis ad Villarino in rupibus litoreis (?). 



Nearest to Macromitrium saddleanum Besch., but much lower, more 

 densely tufted and with denser ramification, besides differing from that 

 species in its non-decurrent leaves and its excurrent leaf-nerve. The 

 upper cells, originally hexagonal, are in the older leaves by hard incrassa- 

 of the membranes very small, oval or nearly round. 



Gen. ZYGODON Hook, et Tayl. 

 ZYGODON CURVICAULIS Dusen n. sp. 



PI. IX, Figs. 6, 7. 



Plus minusque dense caespitosus, caespitibus parvis, lutescenti-viridibus, 

 humillimis; caulis gracilis, usque ad 1.5 cm. altus, erectus vel adscendens, 

 plerumque vage curvatus, apice haud rare subuncinatus, simplex vel parce 

 ramosus, tota longitudine radiculosus, radiculis atropurpureis, minutissime 

 papillosis, illis, qui ex axillis excedunt laevissimis et brevissimis, gemmis 



