— 143 — 



35 — 60^). Compare also the specimen (nr. 1601) mentioned above 

 p. 140. 



The specimens of these variety from the Danish Isles can be 

 referred to two forms: 



f. robusta n. f. Fig. 9. 



Plant of a robust vigorous 

 growth with numerous bran- 

 ches densely crowded. Joints 

 at the base broad, cuneate, 

 strongly 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. 9 were 

 from 30^ — 51// in diameter. 

 This form comes rather near 

 the typical figure of Ellis and 

 Solander (I.e. p. 1 10, 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. cylindica n. f. Fig. 10. 



= ? Halimeda cylindracea 

 Decaisne, Sur les Gorallines (Ann. 

 sc. nat., 2. sér , t. 16). 



Distinguished by having 

 only few erect branches which 

 give the plant a slender appea- 

 rance. The joints are nearly 

 cylindric in the lower and 

 middle part of the plant some- 

 what flattened and triden- 

 tate at the uppermost end. 

 The peripheral utricles were 

 in the specimen figured from 



35 60 a in diameter. Fig. 10. Halimeda incrassata (Ellis et So- 



lander) Lamx. var. monilis, f. cylindrica n. f. 



Forma robusta is a rather 



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