411 



plurilocular sporangia (b), which latter have not been found on 

 Bet pyenocarpus. 



I have also come across plurilocular sporangia occurring on 

 rhizoids such as were observed by Sauvageau (1. c). They are 

 found on thc basal rhizoids, especially of the older piants. 



Fig. 71. Ectocarpus fasciculatus (Griff.) Harv. Formå, a portion of a plant with unilocular sporangia; 

 b branch with plurilocular sporangia; c cell with chromatophores. a and b 160: 1; c 200: 1. 



This species is most commonly met with on exposed coast 

 especially in the littoral zone near low-water mark and in the 

 sublittoral in shallow water. It is quite a common epiphyte, espe- 

 cially on old Himanthalia lorea, Alaria esculenta, Laminaria digitata 

 and other larger algæ growing behveen tide -marks. Plurilocular 

 sporangia occurred in May, June, July and November and uni- 

 locular sporangia in May and June. 



