91 



the surface the filaments grow gradually slender, becoming more 

 and more torulose and more richly ramified (Fig, 75 c, d), woven 

 together, forming a rather firm but yet, seen under the micro- 

 scope, open plectenchyma (Fig. 75 e) ; the diameter of the outer- 

 most filaments varies from 8 — ^10—13 fj. ; the walls here in the 

 outermost filaments are rather thick, thicker than those of the 



Fig. 74. Avrainvillea asarifolia Bergs. 

 Habit of plant. (About -^li :1). 



filaments in the middle of the flabellum. Sometimes the apex of 

 the filaments runs out in a long hair (Fig. 75 /). 



The chromatophores are roundish or oblong and contain a 

 pyrenoid (Fig. 75 g). In older fdaments a good deal of starch 

 is present. 



This characteristic species has its nearest ally, as to the struc- 

 ture of the filaments, in the Indian Ai>r. amadelpha described 



