14 



Dansk Botanisk Arkiv, Bd. 2. Nr. 2. 



Ectocarpus Rallsiæ is evidently nearly related to Ectocarpus 

 coniferus and Ectocarpus irregularis. The most essential differences 

 are as follows: the frequently stalked sporangia, the shape of the 



plurilocular sporan- 

 gia, this being more 

 cylindrical, tapering 

 rather suddenly to- 

 wards the apex (comp. 

 M lle Vickeks' fig. 1. c); 

 and also the distri- 

 bution of the sporan- 

 gia, these being placed 

 anywhere upon the 

 filaments, much more 



irregularly than in 

 Ectocarpus coniferus. 

 Furthermore the fila- 

 ments in Ectocarpus 

 Rallsiæ are nearly all 

 fairly uniform, rea- 

 ching a diameter of 

 about 27 p.. 



This species was only- 

 found once, S t.Th o mas: 

 Store Nordside Bugt. 



Geogr. Distrib. 



West Indies. 



5. Ectocarpus 

 rhodochortonoides 



nov. spec. 

 Ectocarpus fila- 

 mentis erectis e filis 

 repentibus, horizont- 



alibus, irregulariter 

 flexuosis, egredienti- 

 bus instructus. 



Filamenta erecta, parce ramosa, 21 p. crassa, superne in pilum 

 transformata. Articuli in inferiori parte filorum usque ad 3 plo 

 longiores quam latiores, in puis usque ad 14 plo. 



Sporangia plurilocularia sessilia, interdum breve pedicellata, 



Fig. 7. Ectocarpus Rallsiæ Vickers. 

 a part of thallus with plurilocular sporangia. 

 b filament with plurilocular and unilocular spor- 

 angia c, cells in active state in the upper end 

 of a hair, d, base of a plant. 

 (a and b, about 90 : 1 ; c and d, about 70 : 1). 



