55 



Struvea cielicatula Kiitz., Tab. PhycoL, vol. 16, tab. 2. Murray and 

 Boodle, A structural and systematic account of the genus Struvea. (Annals 

 of Bob., vol. 11, p. 265). 



This nice little 

 plant occurs in small, 

 dense tufts in fissures 

 of rocks. The tufted 

 form is due to its 

 mode of growth. From 

 irregularly ramified 



rhizome-like fila- 

 ments creeping on 

 the substratum grow 

 the erect stalks which 

 at their summit bear 

 the more or less 

 regularly branched 

 fronds. The ends of 

 the branches in this 

 leaf-like part of the 

 thallus fix them- 

 selves, as is well 

 known, by means of 

 clamps not only to 

 other filaments in 

 their own leaf but 

 also to other fronds 

 with which they come 

 in contact and in 

 this way the small 

 tufts are formed. 



Mme Weber-VAX 

 BossE has described 

 this way of growing 

 in a very detailed 

 manner in »Etudes 

 sur les Algues de 

 I'Archipel MalaisieiiA 

 (Ann. du Jard. de Buitenzorg, vol. VIII, p. 86 — 87). 



The development of the thallus takes place in the following 

 way. From the irregularly ramified and septate rhizoids, by 

 means of which the plant is fastened to the substratum, nearly 



Fig. 39. Struvea anastomosans (Harv.) Piccone. 

 a and b, tops of young stalks showing develop- 

 ment of the frond, c, somewhat more developed 

 frond, d, plant prepared out from a tuft, with 

 rhizoids and ramified stalk so common in this 

 species; below to the right a young stalk is 

 growing out. e, parts of the frond showing the 

 mode of attachment by means of tenacula. 

 /, chromatophores with pyrenoids. 

 {a, b, c, d, about 6:1; e, 20:1; /, 250:1). 



