XIV. ALG^. 



973 



Tribe III. CHL0R08P0BEM, Thuret.— CONFERVA, Agardh. 



Marine or fresh-water Algce, green, sometimes reduced to a single microscopic cell 

 {Hydrocytium), or composed of simple or branched capillary filaments (Conferva, &c.), 

 or arranged in a network with horizontal meshes [Rydrodidyon, Trypethallus), or 

 interlaced and forming spongy balls (Godium), sometimes dilated into cellular folia- 

 ceous plateSt-^PZva, Udotea, Anadyomene), sometimes tubular [Enteromorplia), some- 

 times umbrella-shaped (Acetabula/ria), or resembling a Moss, a Lycopod, or the branch 

 of a Conifer (Gaulerpa). Eepboductive organs formed by the concentration of the 

 green matter into motile spores, furnished with vibrating hairs, or the result of 

 fertilization by antherozoids. 



Section I. CoNFERViE. — Tubes or cells containing ovoid spores furnished 

 with 2-4 vibrating hairs. 



PEINCIPAL GENERA. 



Section II. TJnicellulares. — Each cell producing several spores furnished 

 with vibrating hairs. 



PEINCIPAL GENERA. 

 Codiolum. Charaeium. Hydrocytium. Sciadium. 



Sub-tribe, (Edogonieje. 



Green Algce, very simple in structure, composed of a series of simple or branched 

 cells ; spores formed by a concentration of the green matter, and escaping by a 

 peculiar division of the mother-cell, ovoid, mobile, furnished with a crown of vibrating 

 hairs, or resulting from impregnation ; antheridia formed of filaments composed of 

 a series of small cells containing 1-2 antherozoids, which issue by an operculum to 

 fertilize the spores contained in the sporangial cell. 



CEdogonium. 



GENERA. 

 BolbocLsete. 



P Dertesia. 



Tribe IV. VAUGHEBIEJE. 



Green fragile Algce, formed of simple not septate filaments, presenting two 

 sorts of reproductive organs ; the one resulting from the concentration of the green 

 matter at the extremity of the filaments, which they burst, and whence they issue 

 in the form of a large oval mobile spore, entirely covered by a ciliate epithelium ; 

 the others the result of fertilization. 



