113 



The specimens of this variety from the Danish Isles can be 

 referred to two forms : 



f. rohusta Borgs. Fig. 90. 



Plant of a robust vi- 

 gorous growth with nu- 

 merous branches densely 

 crowded. Joints at the 

 base broad, cuneate, strong- 

 ly calcified growing to- 

 gether to form a short 

 stem, higher up narrower, 

 tridentate or often nearly 

 cylindrical. The peripheral 

 utricles in the specimen 

 shown in Fig. 90 were from 

 30/^ — 51/^ in diameter. This 

 form comes rather near the 

 typical figure of Ellis and 



SOLANDER (1. C. p. 110, tab. 



20, fig. c). On the other 

 hand it differs rather much 

 from the figure of var. 

 monile given by Mrs. Gepp, 

 1. c. fig. 40. 



f.c?/?mrfrica Bergs. Fig.91. 



= ? Halimeda cylindracea 

 Decaisne, Sur les Corallines (Ann. 

 sc. nat., 2. ser., t. 16). 



Distinguished by having 

 only few erect branches 

 which give the plant a slen- 

 der appearance. The joints 

 are nearly cylindric in the 

 lower and middle part of 

 the plant, somewhat flat- 

 tened and tridentate at the 

 uppermost end. The peri- 

 pheral utricles were in the 

 specimen figured from 35 — 

 60// in diameter. 



Fig. 91. Halimeda incrassata (Ellis et 



Solander) Lamx. 



var. monilis, f. cylindrica Bergs. 



(About 1 : 1). 



8 



