FLORIDE^. 



131 



A still greater amount of complexity occurs in the genus 

 Dudresnaya, where the trichophore and carpogoniura are 

 formed at some distance from each other, and are not in 

 organic continuity. The carpogonia originate as large cells, 

 terminating in short septate branches. The trichogyne ter- 

 minates a row of cells constituting the trichophore. These 



Fig. 20.— Sexual organs of a red seaweed i^Nemalion). A, the end of a 

 branch bearing a cluster of antheridia, S, on one branchlet, and on the 

 other a female organ terminated by a trichogyne, t; 0, the basal portion 

 that becomes the cystocarp or fruit ; two- antherozoid^, s, are seen 

 attached to the trichogyne near its tip. B and C, stages in the develop- 

 ment of the cystocarp ( x 300). (From Prantl.) 



cells very soon put out a number of short branches, and 

 when this stage of development has been reached, the polli- 

 noids become attached to the trichogyne, and their contents 

 absorbed. The short branches springing from the cells of 

 the trichophore increase in length and are csMsd fertilizing- 

 tubes : these grow between the cells of the thallus until they 



