234 



RHODOPHYCEAE 



cells. The primary cell of a carpogonial branch, which is cut off 

 from the apex of a growing cell, becomes pushed down to the side 



Fig. 155. Griffithsia corallina. A, portion of plant with short shoots and 

 branched hairs ( x 18). B, short shoot magnified ( x 312). C, carpogonial branch 

 ( >< 370)- ac = auxiliary' cell, cci, cc^, CC3 = central cells, ^c = pericentral cell, 

 5C = support cell, s?c = sterile cell. D, antheridial branch ( x 720). E, plant with 

 antheridia {a) {xyz). F, tetrasporic branch ( x 222). (A-C, F, after Kylin; 

 D, E, after Grubb.) 



where it divides into three cells. The second cell forms the fertile 

 central cell and gives rise to three pericentral cells, one of which 

 produces a one-celled branch whilst the others produce two-celled 

 branches. The basal cell of each of these two-celled branches gives 



