CHLOROPHYCE.E 145 



DASYCLADACE.E. 



General Characters. The thallus consists of an 

 erect axial cell with no cross-walls, bearing whorls of 

 lateral branches, some hair-like and sterile, others of 

 definite growth and fertile. The shoot is attached 

 by rhizoids to its substratum. Reproduction is 

 effected after the conjugation of gametes. The 

 order is naturally divided into at least two sub-orders, 

 viz. Acetabulariece and Dasycladece. 



Acetabulariece. 



The Thalhis.The erect axis bears at its summit 

 a disc-like cap, consisting of radiating chambers, 

 which in the species of the genus Acetabularia (as 



p IG- 49. Acicularla Schenckii natural size. (After Solms-Laubach.) 



formerly denned) are united to each other laterally 

 so as to form a firm disc. Other species were for- 

 merly placed under Polyphysa, but that genus is now 



