406 



c and d). The plant has only a few rhizoids (fig. 67, e). The main 

 branches are about 60 n thick. 



Formå varians is marked by being subject to considerable 

 variation in the form of its sporangia, and even if the Færoese 



Fig. 68. Ectocarpus siliculosus (Dillw.) Lyngb. f. varians Kuck. Different parts of the plant. 

 a, b 100 : 1 ; c, d, e, f 150 : 1; g 270 : 1. 



specimens do not exhibit the extreme variations described by 

 Kuckuck, 1. c., yet I feel quite justitied in referring the specimens 

 found by me to this form, and Dr. Kuckuck to whom I showed 

 my preparations agrees with me in this. Fig. 68 represents some 

 fragments of this plant. As may be seen, the form of the sporangia 

 varies considerably, being sometimes like typical siliculosus, some- 



