F. Borgesen: Rhodophyceæ of the Danish W. Indies. 5 



Bangia Alsidii Zanard., Bibl. Ital., t. 96, 1889 (not seen); id., Synop- 

 sis Alg. mar. Adriat. (Memorie d. r. Accademia d. Scienze di Torino, Serie 

 II, Tomo IV, 1842, p. 217, tab. VI, fig. 7). 



Goniotrichum Alsidii (Zanard.) Howe, The marine Algæ of Peru (Me- 

 moirs of the Torrey Botanical Club, vol. XV, 1914, p. 15'). 



The specimens found reached a length of about 1mm.; at 

 their base they were about 25 — 3b ju thick, at the summit only 

 about Ibjui. 



They are fixed to the substratum by means of a small disc 

 formed by the basal cell (Fig. 2 c). 



Fig. 2. Goniotrichum elegans (Chauv.) Le Jolis. 



a and b, parts of the thallus showing ramification, c, base of a plant. 



d, summit of plant with longitudinally divided cells. (About 150 : 1). 



The fdaments (Fig. 2 a and b) consist for the most part of 

 a single row of cells and in some specimens these were almost 

 the only ones which occurred, but several specimens had filaments 

 which more or less consisted of 2 — 3 or even 4 cells in transverse 

 section. The cells in these filaments are irregularly arranged, 



') The reason I do not follow Dr. Howe in using Zanardini's name for 

 this species is because it seems impossible judging from Zanardini's 

 description and figure to say quite certainly which species of Goniotri- 

 chum we have to do with. 



