F. Børgesen: Rhodophyceæ of the Danish W. Indies. 



81 



a 



Fig. 87. Liagora pulverulenla C. Ag. Parts of two 

 specimens from Rust up Twist. (About 3:1). 



The specimens 

 I have referred to 

 this species have a 

 more or less re- 

 gular dichotomous 

 ramification but at 

 the same time a 

 good many proli- 

 ferations are pre- 

 sent (Fig. 87). 



The assimila- 

 ting filaments (Fig. 

 88 a, b, c) are re- 

 latively short, 

 about 300 fx long; 

 they are 5 — 6 times 

 forked and their 

 outline is corymbi- 

 form. In the lower part bf the filaments the cells are subcylin- 



drical, about 9 — 12 ju thick; 

 higher up they become 

 very thin their diameter 

 varying from 3 — 6 fj. ; to- 

 wards the summits of the 

 filaments they rather sud- 

 denly grow shorter and 

 at the same time thicker, 

 oval or in the uppermost 

 part nearly spherical, their 

 diameter reaching a length 

 of up to 12 ju. The cells 

 in the summits of the young 

 assimilating filaments often 

 have long thin hyaline hairs 

 whose length sometimes 

 reaches double that of 

 the assimilating filaments. 

 When young these hairs 

 are clavate with much pro- 

 toplasm especially in the 

 thickened end (Fig. 88 d, 

 e, /) ; later they become 



6 



80Ta: 



Fig. 88. Liagora pulverulenla C. Ag. 

 a, assimilating filament, b, part of the same 

 with a hair, c, assimilating filament with 

 carpogonial branches, d, e, f, young hairs. 

 {a, about 140 : 1 ; b, 200 : 1; c, 60 : 1; (/, e, 

 f, 160:1). 



Dansk Botanisk Arkiv, Bd. 3. Nr. 1. (191C). 



