116 



Fig. 125. Wrangelia Argus Mont. Disc- 

 shaped haptera growing out from a basal 

 cell in a ramulus found in the lowermost 

 prostate part of the thallus. The upper 

 large cell in the main filament is broken 

 off. (About 150:1). 



Wrangelia plebeja J. Ag., Spec. 

 Alg., vol. II, pars. 3, 1863, p. 707: Epi- 

 crisis, 1876, p. 623. 



This species especially differs 

 from Wiwngelia penicillata in its 

 small size being seldom more than 

 1 ! 1 / 2 cm high, the acute ends 

 of the filaments composing the 

 ramuli and the lack of a dense 

 cortical layer. 



The West Indian specimens 

 are as to their external habit 

 much like figure 4/ of MON- 



TAGNE, 1. C. 



Wrangelia Argus is a littoral 

 alga growing even in rather ex- 

 posed places. It is fixed to the 

 substratum by means of nume- 

 rous, often very robust hapterse 

 which grow out from the basal 

 cells in the ramuli found in the 

 lowermost more or less prostrate 



St. Croix: in several lo- 

 calities near Christiansted in the 

 harbour, Long Reef, Lt. Princess. 



Geogr. Distrib.: Warmer 

 parts of the Atlantic Ocean, 

 Mediterranean Sea, Ceylon etc. 



Fam. 4. 

 Wrangeliacece. 



Wrangelia C. Ag. 



1. Wrangelia Argus Mont. 



MONTAGNE, J. F. C., Sylloge 

 generum specierumque Crypto- 

 gamarum, Paris 1856, p. 444. 



Griffithsia Argus Mont, in 

 WEBB et BERTHELOT, Hist. nat. 

 des iles Canaries, vol. Ill, Sectio 

 III, Paris 183650, p. 176, tab. 

 8, fig. 4. 



Fig. 126. Wrangelia Argus Mont. 

 Upper end of a branch with ra- 

 muli and tetrasporangia. (About 

 80 : 1). 



