4 



In my material also I have found several times filaments in 

 which the most part of the cells were transformed to akinetes 

 (Fig. 1 d). These cells had each a very thick wall (about 2^ thick) 

 of a firm consistency, while on the other hand the common 

 membrane in the whole filament is thin agreeing with the des- 

 cription of ROSENVINGE. 



The akinetes escape through a hole in the membrane of the 

 filament (comp. fig. 1 d). They have very dense granular contents 



and are often oblong, sometimes also globular 

 or ellipsoidal; their diameter reaches a length 

 of about 14//. 



The filaments reach a thickness of about 

 16 21^, 'while the vegetative cells are about 

 6 1 /u. In one case a specimen was found in 

 which the main filament was about 25^ and 

 the diameter of the cells about 10 p while the 

 branches only reached the thickness mentioned 

 above. ROSENVINGE also mentions that he 

 has found a single specimen of a similar 

 thickness. The chromatophore is, as well known, 

 starlike (Fig. 1 c). 



Having only examined specimens preserved 

 in spirit I cannot say anything as to the 

 colour of the plant. As several authors have 

 stated that they have found Asterocytis ramosa 

 in brackish water (comp. ROSENVINGE, 1. c. 

 p. 78) I may add that the plant in the West 

 Indies was found in quite salt water. 



Found upon Liagora elongata at Long Point, 

 St. Croix. 



Geogr. Distrib. Atlantic coast of Europe, 

 Mediterranean Sea, North America. 



Fig. 



1. Asterocytis 

 ramosa (Twaites) 

 Gobi, a, part of a 

 plant, b, summit of 

 a filament with lon- 

 ger cells. c, cells 

 with chromatopho- 

 re. d, part of a fila- 

 ment with akinetes. 

 (aandfc,aboutl25:l, 

 candd, about 200:1). 



Goniotrichum Kdtz. 



1. Groniotrichum elegans (Chauv.) Le Jolis. 



LE JOLIS, Alg. mar. Cherb., p. 103. BERTHOLD, 

 Bangiacea?, p. 26. HAUCK, Meeresalgen, p. 518. RO- 

 SENVINGE, Marine Alg. of Denmark, part I, p. 75. 



Bangia elegans Ghauvin, Alg. Norm. no. 159 ; 



Mem. Soc. Linn. Norm., t. 6, 1838 (not seen), id., Recherches . . d'Algues, 

 Caen. 1842, p. 33. HARVEY, Phyc. Brit., pi. 246. 



