278 



F. BORGESEK 



the upper, well developed whorls are often more than 5 mm broad; downwards 

 the hairs gradually die away and fall off. 



This basal part, always unbranched it appears, bears the glabrous repeatedly 

 subdichotomous upper part of the thallus. It is terete and jointed, with joints 

 of varying length, from 5 to 8 mm. At the summit and also at the ends of 

 the joints now and then a more or less well developed whorl of hairs is present. 



Fig. 24. Galaxaura paschalis now spec, a— b fragments of thallus with short (a, c. 136 /i) and 

 long (b, c. m /i) assimilating filaments; c cross section in the upper part of a branch, c. 250 /'- 



The anatomy of the basal part (Fig. 24 a, b) reminds very much of what 

 we find in the group Rhodura. The whorls consist of long assimilating fila- 

 ments with shorter ones intermingled. The short assimilating filaments (Figs. 

 24 a, 25) are composed of 3 — 4 or more roundish oval cells; the uppermost are 

 smallest, almost spherical or a little longer than broad, about 20 — 25 <x thick, 

 the lowermost oblong and much larger, up to 60 \x thick. The long assimilating 

 filaments (Fig. 24 b) have basal cells of nearly the same shape as those found 

 in the short ones; the cylindrical part consists of cells about 24 \x thick and 

 80 \x long. They have rather thick walls and are only very little narrowed at 

 the cross walls. 



