The Genus Rkcardia in Chile. 183 



labelled A. profunda) ; Port Gallant, Citniiiiigliain ijy in part 

 (M.) ; Island Harbor, Citiuiinghain 4j (M.) ; Staten Island, 

 1882, Spega^::iiu 39, 44 (M., apparently listed as R. piniiatifida, 

 i6, p. 254). 



The following additional stations for Ancura florihunda are 

 given in Stephani's papers: Punta Arenas, Duscn (29, p. 8); 

 Clarence Island, Racovitza lySd, iSje (30, p. 4) ; Hale and 

 Atalaya Islands, Puerto Gray, Skyring, Otway Bay, Canal Ino- 

 centes, Canal Inga, Skottshcrg (32, p. 7, and 22, p. 50, etc.). 

 There are likewise two reports from the Falkand Islands (31, p. 2, 

 and 32, p. 7). 



There are several important characters of R. florihunda which 

 the material at hand does not show very clearly. It is impossible 

 to determine, for example, how the young plants attach themselves 

 to the substratum. The specimens examined are all mature and 

 show a densely tufted habit, the plants being apparently erect and 

 wholly destitute of rhizoids. Some are in pure colonies, while 

 others occur in admixture. The color is a dull green, more or less 

 tinged with yellow or brown and often becoming a dark brown with 

 age. 



The living part of the axis (Fig. 12, A, B), which shows long- 

 continued growth, is mostly 1.5-2.5 cm. in length; the width is 

 0.7-1.2 mm. and the thickness about 0.5 mm. in the wider speci- 

 mens. The upper surface (Fig. 12, D) is plane or slightly con- 

 cave, while the lower surface is somewhat convex. Toward the 

 sides the axis thins out slightly but the edges are rounded and 

 there is no indication whatever of wings. In the median portion 

 the axis is mostly eight to ten cells thick. The surface-cells, which 

 form a uniform layer over the entire structure, average about 45 p, 

 in length and 32 fx in width. Between these and the interior cells 

 the change in size is very abrupt, the latter measuring 160-220 fx 

 in length by about 75 ju in width. The cell-walls are everywhere 

 slightly but uniformly thickened, and the outer walls of the 

 surface-cells are either plane or very slightly bulging. 



The branching of the axis (Fig. 12, A, B) is exceedingly irregu- 

 lar. The branch-rudiments or branches occur at intervals of 

 0.5-2.5 mm. on each side. The branch-rudiments (Fig. 12, C), 

 which are more frequent than in R. diversiflora, are in the form of 

 short, deeply indented lobes with the apical cell at the bottom of the 



