PHAEOPHYCEAE. 555 



Streblonemopsis irritans Val. forms wart-like galls on 

 Ci/stosird ojjii iifioidt's. 



Entonema grows between and into the cells of lihodujjhi/ceae 

 and Melanojjhyceae. 



3. RHODOPHYCEAE. 



The HhvdopJn/rirn' or F/oridrae occur endophytic only in other 

 algae ; c.f/. Harveyella mirabilis (Reinsch) vegetates in thalli of 

 Bhodomeleae and Polydphoneae, but reproduces itself outside 

 its host. Species of Chorcocolax and other genera have a similar 

 mode of life. 



