F. Børgesen: Rhodophyceæ of the Danish W. Indies. 63 



of Nemalion luhriciim according to the statement of L. Kurssanow 

 in "Flora", 99. Bd., 1909 p. 311. It is here pointed out in ac- 

 cordance with the opinions of earher investigators and in con- 

 tradiction to Wolfe's statement that a pyrenoid is present in 

 the middle of the chromatophore. 



Rarely the vegetative cells terminate in a rather long hair 

 (Fig. 65 A). 



Most often the main cell-thread in the middle of the above 

 mentioned groups of assimilating-filaments terminate in a carpo- 

 gonium and further also often 2 — 4 or more side-branches like- 

 wise bear terminal carpogonia (Fig. 65 A). Fig. 65 C shows a 

 branch dichotomously divided, in which the branches terminate 

 in a carpogonium. 



The carpogonial branch is composed usually of 4 cells, but 

 sometimes only 3 occur, occasionally even 5. This is in agreement 

 with Nemalion miiltifidum where the number of cells also is some- 

 what variable. Bornet and Thuret^) give the number to be 3 — 4, 

 Janczewski^) indicates it to be composed of 3 cells and Wolfe 

 (1. c, p. 613) writes: "This carpogonic branch is composed usually 

 of three cells; since, however, the number varies from two, in the 

 simplest noted, to as many as five, it cannot be considered as 

 in any way significant". A well developed nucleus was found in 

 each of the cells of the carpogonial branch (Fig. 6b B); on the 

 other hand the chromatophore was not very conspicuous even if 

 it was not quite absent as Janczewski describes it. The cells of 

 the carpogonial branch are roundish-subquadrangular and usually 

 a little shorter and thicker than the vegetative cells in the lowest 

 part of the cell-thread. By means of this they are also most 

 often easily recognisable though I must confess that it may 

 sometimes be difficult to decide where the carpogonial branch 

 begins and the vegetative cells end, as Wolfe has also pointed 

 out in this way concerning the carpogonial branch of Nemalion 

 miiltifidum (1. c. p. 613): "The lowest cell of the series partakes 

 to some extent of the characters of both, and thus lessens the 

 abruptness of the transition between the two types". 



The carpogonium bears a rather short and often somewhat 

 bent trichogyne which is swollen towards its apex. In spite of 



^) Bornet, E. et G. Tu uret, Recherches sur la fécondation des Floridées 



(Ann. se. nat. Botanique, V. sér., t. 7, 1667 p. 141). 

 *) Janczewski, E., Notes sur le développement du cystocarpe dans les 



Floridées. (Mém. de la Soc. Nat. d. Se. Nat. de Cherbourg, vol. XX, 



p. 109). 



