FLO RIB EM 



207 



discs attached to rocks, or on the leaves of Zostera, or on other seaweeds. 

 The sexual reproductive organs and the; ijonrsexual organs of propaga- 

 tion are alike formed in small cavities or coneeptacles, which are either 

 entirely imbedded in the thallus, or more often form external wart-like or 

 ovoid swellings. The female'conceptacle opens at the apex by an ostiole 

 (fig. 182, a);, the very short sporiferous filaments, the terminal cells of which 





•\ 



Fig. 184 — CoralHna riihens L. a, branch with three cystocarps and a male conceptacle ; con- 

 ceptacles of Melobesia Thureti Born, are attached to the upper part of the branch ( x 20) ; ^, longi- 

 tudinal section through a male conceptacle deprived of its calcareous incrustation (x 160) ; c. pol- 

 linoids ( x 40b). (After Bornet.) 



become the carpospores, spring from the base ■ of the cavity, and are 

 accompanied by paraphyses. The male conceptacles are of similar 

 structure ; the pollinoids (fig. 182, i) possess one or two short appen- 

 dages. The non-sexual present a general resemblance to the sexual 

 conceptacles 5 the tetrasporanges spring from their base and sides, and 

 are accompanied by paraphyses ; the contents of the sporange not uij- 



