168 



V 



B 



Fig. 84. 



Furcellaria fastigiata. Ti-aiis- 

 ver.se sections of antlieridin- 

 bearinslVontls.Decenib. 835:1. 



Fig. 85. ■ 



Furcellaria fastigiala, Carpogonial bran- 

 ches. A and /i. two-celled, C and D, 3- and 

 1-celled. In D, the oarpoHonium has pro- 

 duced an outgrowth (sporogenous fila- 

 ment ?i at the base, althougli the tricho- 

 gync is very short and unfertilized. A, 

 September, 230:1, B^D, August, 390:1. 



from small cells, not infre- 

 quently smaller than themsel- 

 ves. In a transverse section of 

 the frond these androphore- 

 cells, which seem to contain 

 chromatophores, are seen bear- 

 ing two antheridial cells of 

 different age. Probably they 

 may sometimes bear more than 

 two, and the production of an- 

 theridia may possibly be con- 

 tinued after the first has been 

 exhausted. The antheridia al- 

 ways occur in particular male 

 plants ; they were first described 

 and figured by Thuret in 1855. Fully developed 

 antheridia have been met with in December, but they 

 may probably occur much earlier. Antheridia con- 

 taining ripe spermatia have further been found in 

 January to March, and in May I have still found spe- 

 cimens with white antheridial branches containing numerous spermatia (no. 5793, 

 UL, 0jet, in Kw, 20 meters depth). 



The carpogonia appear at the end of the summer, and in August young goni- 



moblasts may already be met 

 with. The carpogonial bran- 

 ches arise in the inner cortex 

 or at the limit between the 

 cortex and the central tissue; 

 thej^ are frequently placed in 

 small groups, and two or three 

 of them may be given off from 

 one of the large storage cells. 

 They are almost always two- 

 or three-celled. The inferior 

 cells of the carpogonial bran- 

 ches are globular or ovate, they 

 contain one or two nuclei, small 

 chromatophores and numerous 

 small starch grains. The car- 

 pogonium is much narrowed 

 •^'S- 86. over the basal part, the nar- 



Fiircellaria fastiqiata, sections of fronds with young cystocarps, August. . . 



a, auxiliary cell; s. sporogenous filaments, g, gonimoblast. 210:1. rOWing being deepest Oil OUC 



