XIV. A.LGM. 973 



TRIBE III. CHLOROSPORE^, 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 (Hydrodictyon, Trypethallus) , or 

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

 ceous plates (Ulva, Udotea, Anadyomene), sometimes tubular (Enteromorpha) , some- 

 times umbrella-shaped (Acetabularia), or resembling a Moss, a Lycopod, or the branch 

 of a Conifer (Caulerpa). BEPRODUCTIVE 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. CONFERVA. Tubes or cells containing ovoid spores furnished 

 with 2-4 vibrating hairs. 



PRINCIPAL GENERA, 



Conferva. Ulva. Anadyomene. Caulerpa. Penicillus. 



Ulothrix. Dasycladus. Cymopolia. 



Hydrodyction. Coleochsete. Microdyction. 



Chsetophora. Acetabularia. Halymeda. 



Microspora. Draparaaldia. Bryopsis. Neomeris. Udotea. 



Cladophora. Codium. Bellotia. 



SECTION II. UNICELLULARES. Each cell producing several spores furnished 

 with vibrating hairs. 



PRINCIPAL GENERA. 



Codiolum. Characium. 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. 



GENERA. 

 CEdogonium. Bolbochaete. ? Derbesia. 



TRIBE IV. VATJCHERIEM. 



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. 



