F. Børgesen: Rhodophyceæ of the Danish W. Indies. 



RHODOPHYCEÆ 



A. Protoflorideæ. 

 I. Bangiales. 



Fam. 1. Bangiacece, 



Subfam. 1. Goniotrichieæ. 



Asterocytis Gobi. 



1. Asterocytis ramosa (Thwaites) Gobi. 



Gobi, C, in Arbeiten St. Petersb. Naturf. Ges., Bd. X, 1877, p. 85. 

 Schmitz, Fr., in Nuova Notarisia, 1894, p. 717; id. in Engler u. Prantl, 

 Nat. Pflanzenfam., I. Part, 2. Abt., p. 314. Wille, N., Algolog. Notiz., 1— IV 

 (Nyt Magazin f. Naturv., Bd. 38, 1900, p. 7, tab. 1, figs. 8—14). Rosen- 

 vinge, L. Kolderup, The marine Algæ of Denmark, 1909, p. 77. 



Hormospora ramosa Thwaites in Harvey, Phycologia Brit., pi. 213. 



Goniotrichum ramosum Hauclc, Meeresalg., p. 517. Batters, Mar. Alg. 

 Berwick, p. 13; Lakowitz, Algenfl. Danziger Bucht, 1907, p. 79. 



Growing upon specimens of Liagora elongata I have several 

 times found a small alga which undoubtedly belongs to this genus 

 and as these specimens seem to differ in no essential way from 

 A. ramosa I have referred them to it. 



The specimens found were often rather large and repeatedly 

 branched (Fig. la); in some specimens the vegetative cells were 

 nearly globular or subquadrate, about as long as broad, in others 

 the cells were oblong or ellipsoidal (Fig. 1 h). 



This plant has been recently examined in detail by Wille 

 (1900, I. c.) and by Rosenvinge (1909, 1. c). Wille describes the 

 setting free of the spores which is as pointed out by Rosenvinge 

 in accordance with the earlier description of Schmitz. Wille 

 describes furthermore some few cells with membranes which he 

 supposes to be akinetes. Rosenvinge has now stated that the 

 supposed akinetes of Wille are really such. He was fortunate 

 enough to find filaments in which nearly all the cells were trans- 

 formed to akinetes. 



