OOSPORES. 
The Confervaceae, like the CEdogoniege, consist of rows of cells or segmented fila- 
ments, which either remain unbranched, as in Chsetomorpha, or become branched, as in 
Cladophora, Rhi%oclonium^ Stigeoclonium (Fig. 3), Draparnaldia, Chaßtophora^. With re- 
ference to their reproduction, it is only known that macro- and micro-zoogonidia are 
formed in the cells of the filaments {Chsetomorpha, Cladophora), the sexual significance 
of which is still unknown 2; and that in the other above-mentioned plants resting-spores 
are formed in certain cells of the filaments. Pringsheim suggests that they are probably 
equivalent to oospores, but that they are produced parthenogenetically. 
E. FUCOIDE^. 
The FucaeeaB comprise, in the narrow limitation proposed by Thuret^, a few 
genera of large marine Algae, the thallomes of which, often many feet long, have a 
Fig. ■L?,^.—Fucits p/afycarpiis (after Thuret) ; A end of one of the larger branches (natural size) ;yy fertile branchlets ; 
B transverse section of a conceptacle ; d the surrounding epidermal tissue ; a the hairs projecting from the mouth ; b hairs 
in the interior ; c oogonia, e antheridia (of. Fig. 2, p. 3). 
greenish-brown colour and a cartilaginous consistency. They are fixed to stones or 
other bodies by a branched attachment-disc. The thallomes branch dichotomously, 
and the further development is also frequently forked, but in other cases sympodial, as 
in Fig. 184. The ramifications, irrespectively of later displacements, all lie in one 
plane. 
^ [The Ulvacese are probably allied to the Confervacece. In them the cells are arranged so 
as to form a delicate membrane.] 
[According to Areschoiig (Nov. Act. reg. see. sei. Upsal. ser. 3. vol. IX) the microzoogonidia 
of Cladophora conjugate in pairs.] 
G. Thuret, Ann. des Sei. Nat. IL 1854, p. 19;. 
