378 



BOTANY 



TAUT II 



Harvcyclla mirahilis (^■*), one of the Florideae occurring in the North Sea, is of 



F'li;. 304. — Duilresnayacoci-inea. ^, Caipogonial branch ; f, carpogoniuni ; <, tricliogyne. 7J, cariio- 

 goiiium after fertilisation, grown out into tlie .sporogenous lilament (s/). C, fusion of the. 

 sporogenous HlamPnt with the first a\ixiliary cell (rij). D, branching of the filament and fusion 

 with six auxiliary cells (aj-ag) ; the cells a^i-ao are borne on branches originating from the axis 

 hit (diagrammatic). A', Ripe cluster of carpospores originating from one branch. (.I-D, after 

 Oltmanns ; A', after Bornict. J-C, x about .'lOO ; D, x 250 ; A', 300.) 



.Special interest. It grow.s as a parasite on anotiier red seaweed, lihodomela suh- 

 fusca, on which it ajypcars in the 



form of a small white cnshion-like growth. 



