FLORIDE.^ 



207 



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

 The sexual reproductive organs and the non-sexual organs of propaga- 

 tion are alike formed in small cavities or conceptades^ 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 



a 



i 



X 



Fig. 184 — Corallina rubens L. a, branch with three cj-stocarps and a male conceptacle ; con- 

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

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

 linoids(x 400). (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 poUinoids (fig. 182, d) possess one or two short appen- 

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

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

 are accompanied by paraphyses : the contents of the sporange not un- 



