THALLOPHYTA— ALG.E 



45 



Certain conceptacles in some of the Fucacete do not give rise 

 to sexual organs. These are generally known as cryptostomata. 



Fig. 794. 



Fm. 796. 



Fig. 795 



Fig. 794. Vertical section of a female couceptacle of Fi/ciis resicidosus con- 

 taining oogonia and paraphyses. After Thuret. Fig. 795. Antberidia, 



a, a, on the branched hairs of the male conceptacle. After Thnret. — — 

 Fig. 796. Oogonium with the oospheres fully separated, and disengaging 



themselves from their coverings. After Thuret. Fig. 797. An oosphere 



without a cellulose coat being fertilised by antherozoids so as to form an 

 oospore. 



These cavities contain only paraphyses, which are of greater 

 length than those in the fertile conceptacles. 



The Laminaeiace^ afford examples of the largest Algae of the 



