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GENERA 



BELONGING TO THE FIRST ORDER OF THE SECOND CLASS. 



Telesto. Polypidoms branching ; fistular ; creta- 

 ceo-membranous, opaque, longitudinally striated. 



Liagora. Lichen-formed ; slightly incrusted with 

 a chalky substance. 



Neomeris. Simple, cellular in the upper part; 

 embossed in the middle, and scaly in the lower part. 



Acetabularia. Umbelliferous ; umbel flat and 

 striated in rays. 



Polyphysa. Stem simple, and crowned with eight 

 to twelve pyriform and polypean bodies. 



Nesea. Pencil-form ; branches articulated, cylindri- 

 cal, and dichotomous. 



Galaxaura. Fistular, dichotomous, and articu- 

 lated. 



