968 



The reproductive organs of Flaridece have received various names. Ceramidia are oval conceptacles, 

 presenting an aperture (ostiole) at the top, and containing quaternary spores (spherosporcs). Kalidia, cap- 

 sules, and cystocarps are bodies of the same form as the preceding, but containing undivided spores. 

 These organs and the follovfing terminate, when young and unfertilized, in a sort of long hair on which 

 the antherozoids rest, and -which MM. Bornet and Thuret have termed trichogyne ; this hair is intended 

 to transmit the fertilizing fluid. FaveUcs are spherical conceptacles, axillary or terminal, with a smooth 

 wall, sometimes surrounded by a sort of involucre, formed of small branchlets {Ceramium, &c.). Coccidia 

 are coriaceous conceptacles, usually open at the top, and containing reproductive corpuscules (Delesseria). 

 Styehidia are little spikes containing quaternary spores regularly arranged. The fronds of some Floridece 

 sometimes bear on their surface isolated cells, forming a sort of sporangium, containing four spores 

 {Delesserid) ; sometimes each of the cells of the membranous frond gives birth to spores {Porphyrd). 



The antheridia of Floridece form a thin layer, transparent at the surface of the frond, or little axillary 

 tufts either naked or involucred (Oriffitlma seteced), or appear as a small distorted palette {Chondiia), or 

 as a small conical mass (Lejolida). In all cases the antheridia, whether united in little racemes, or in 

 an assemblage of small utricles, contain an oblong or globose antherozoid, with neither hairs nor motion. 

 In Porphyra, the antheridia originate in the transformation of the marginal cells of the frond, which 

 divide into a large number of small colourless cells, becoming so many antherozoids. 



Tbibe II. PE^OSFOEEM et FTlGAGEM, Thuret.— APLOSPOBEJE, Dene.— 



MELANOSPOEE^, Earv. 



Macrocystis pyrifera. 

 (The adult plant is from 60 to 200 feet in length.) 



Fiicus serratm. Branched jolited hairs, 

 bearing the antheridia (mag.). 



