PHAEOPHYCEAE. 555 



Streblonemopsis irritans Val. forms wart-like galls on 

 Cystosira ojauntioides. 



Entonema grows between and into the cells of Bhodophyceae 

 and Melanophyceae. 



3. RHODOPHYCEAE. 



The Bhodophyceae or Florideae occur endophytic only in other 

 algae ; e.g. Harveyella mirabilis (Eeinsch) vegetates in thalli of 

 Bhodomeleae and Folysiphoneae, but reproduces itself outside 

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

 mode of life. 



