F. Borgesen: Phæophyceæ of the Danish W. Indies. 9 



Sporangia plurilocularia plerumque axillaria, sessilia, dense 

 aggregata, conico-elongata, magnitudine variabili, minora = 40// 

 long, et 24// lat., majora = 110// long, et 40// lat., plerumque 

 1—3, rarius plura aggregata. Sporangia unilocularia ovata. Chro- 

 matophora disciformia numerosa in cellulis præsentia. 



The plant is fixed to the substratum by means of short 



Fig. 5. Ectocarpus coniferus nov. spec. 

 Part of a plant with plurilocular sporangia. (About 60: 1). 



rhizoids growing out from the lowermost cells in the filaments 

 (Fig. 6 6). 



The main filaments are about 40// thick consisting of cells 

 from nearly l l% to 3 — 4 times longer than broad. The lengthening 

 of the main filaments is mostly restricted to limited intercalary 

 growing-points which occur near the insertion of a branch (Fig. 6 a) 

 but now and then, also, a single cell here and there in the fila- 

 ments may start to divide. All the filaments and lateral branches 



