968 



XIV. ALG^l. 



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

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

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

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

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

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

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

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

 Stychidia are little spikes containing quaternary spores regularly arranged. The fronds of some Florideee 

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

 (Delesseria) ; sometimes each of the cells of the membranous frond gives birth to spores (Porphyra). 



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

 tufts either naked or involucred (Griffithsia setecea), or appear as a small distorted palette (Chondria), or 

 as a small conical mass (Lejolma). lu 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. 



TEIBE II. PH^OSPORE^ et FUCACEM, Thuret. APLOSPORE&, Dcne.- 



MELANOSPOREJE, Harv. 



- Jfacrocystii pyrtfera. 

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



Fuctu ttrratus. Branched jointed hairs, 

 bearing the antheridia (mag.)- 



