269 



The branches are placed in the 

 axil of the trichoblast, or more 

 correctly they are pushed a little to 

 the left side of them (Fig. 263). 



By its way of growing and whole 

 construction and habit this plant re- 

 minds one very much of the prece- 

 ding species, but being quite sterile 

 it is impossible to give a more exact 

 definition of it. 



Found once in shallow water near the 

 shore in Store Nordsidebugt (Magens. Bay) ; 

 St. Thomas. 



3. Polysiphonia variegata (Ag.) Zan. 



ZANARDINI, G., Synopsis alg. mar. 

 Adriat. in Memorie Real. Accad. d. To- 

 rino, Serie II, T. IV, 1842, p. 162. J. 

 AGARDH, Spec. Alg., vol. II, 3, p. 1030; 

 KUTZING, Spec. Alg., p. 821; Tab. Phycolog., 

 XIII, tab. 81. HARVEY, Phycolog. Brit., 

 pi. 155; Nereis Bor.-Am., part II. p. 45. 

 THURET ET BORNET, fCtudes Phycolo- 

 giques, p. 86, pi. 42. FALKENBERG, Rho- 

 domelaceen, p. 119, tab. 21, fig. 30. BER- 

 THOLD, Beitr. z. Morphologic und Physio- 

 logie der Meeresalgen (Pringsh. Jahrb. 13, 



Fig. 264* Polysiphonia variegata (Ag.) Zan 



Basal part of a filament with rhizoids. 



(About 260:1). 



Fig. 263. Polysiphonia spec. 

 Part of filament near its sum- 

 mit with trichoblasts and 

 branches. (About 350 : 1). 



pi. XX. fig. 816)- 



Hutchinsia variegata Ag. 

 Systema, p 153. 



Cfr. DE-TON i, Sylloge 

 Alg. Vol. IV. Sect. Ill, p. 

 922, ubi syn. pluria. 



The plant grows upon 

 the roots of the man- 

 srroves and forms dense 



o 



bushes up to 10 cm or 

 more in height. It is 

 fastened to the substra- 

 tum by means of nume- 

 rous rhizoids issuing 

 from the decumbent 

 creeping filaments (Fig. 

 264). The rhizoids are 



