110 



Fig. 118. 



Galaxaura occidentalis nov. 

 spec. Parts of the thallus. The figure 

 to the left from a specimen preserved 

 in alcohol , that to the right from a 

 dried specimen. (About 1,5 : 1). 



fronde jnveniliori rmmerosissimae, rectse, clavatae subcylin- 

 dricse, summo mucronatee, ca. 40 ( long* et 11 p. latse. 



The base of the plant 

 is a broad disc by means 

 of which it is fastened to 

 the substratum ; it consists 

 of numerous rhizoidal fila- 

 ments. These are dichoto- 

 mously ramified and com- 

 posed of cylindrical, nearly 

 colourless cells, with uneven 

 walls, about 14 thick. 



From this basal part 

 the erect shoots (Fig. 118) 

 grow up in all directions. 

 These are much branched 

 and the ramification is more 

 or less regularly dichoto- 

 mous. In the lower part 



the thallus is terete but it soon grows flat; in the dried plant 

 the edges are mostly prominent the thallus thus getting a ca- 

 naliculate appearance (compare Fig. 118). The branches are 

 about 2 3 mm broad 

 and about 1 mm thick ; 

 the internodes taper 

 somewhat below and 

 are often jointed at 

 the base. The plant 

 preserved in spirit is 

 not canaliculated but 

 has broadly rounded 

 edges. 



The colour of the 

 dried plant has a 

 greyish or dirty olive- 

 brown tinge; in the 

 lower part the sur- 

 face is dull and of a 

 mealy appearance : in 



the upper young parts often smooth and glossy, sometimes 

 shining like mother of pearl and of a light greyish -yellow 

 colour. 



Fig. 119. Galaxaura occidentalis nov. spec. 

 a, transverse section of the periferic tissue 

 showing lobed cells, b, the lowermost cells in 

 in the peripheric tissue seen from above. (About 



200:1). 



