118 



Dansk Botanisk Arkiv, Bd. 3. Nr. 1 



2. Wrangelia bicuspidata nov. spec. 

 Frons mediocris, ca. 7 cm alta, cæspitosa, ramosa, ecorticata 

 vel in ramis principalibus subcorticata, in superiori et inferiori 

 parte cellularum magnarum filis decurrentibus et assurgentibus, 

 ex cellulis basalibus ramellorum ortis, munita. 



Cellulæ in ramis principalibus permagnæ, subcylindricæ, 120 n 

 latæ et 10-plo longiores, in superiori parte ad genicula verticilla- 



tim ramellosæ, ramellis mol- 

 lissimis, pluries dichotome 

 divisis, a basi ad apicem 

 leniter tenuioribus, termi- 

 nali articulo generaliter bi- 

 cuspidato, cellulis in parte 

 basali ca. 50/^ latis, supre- 

 mis ca. 1 /i latis. 



Fructificatio ignota. 

 All the specimens found 

 were sterile so in referring 

 them to Wrangelia I have 

 only had the vegetative 

 thallus to rely on, but this 

 shows so much likeness to 

 the other species of Wran- 

 selia that I have no hesi- 

 tation in referring it to 

 this genus. 



As being especially 

 characteristic of this 

 plant may be mentioned 

 the fact that the cor- 

 tical layer is not much 

 developed and that the 

 apices of the assimilating 

 filaments mostly end in two short acute conical cells. 



Wrangelia bicuspidata is a sublitoral alga growing in rather 

 deep water, 20—30 meters or more. It is an epiphyte, as in the 

 case of Wrangelia penicillata found upon different large algæ, 

 e. g. Caulerpa, Halimeda, Avrainvillea etc. and is fixed to these by 

 means of thin rhizoids growing out from the lowermost parts of 

 the filaments. 



The plant has a beautiful rosy colour and forms loose, flabby 

 tufts up to seven cm or more in height (Fig. 127). The principal 



Fig. 128. Wrangelia bicuspidata nov. spec. 

 Part of a main branch with the basal 

 parts of the branchlets from which fila- 

 ments grow out upwards and downwards. 

 (About 60 : 1). 



