172 



BOTANY. 



known as tetraspores {A and B, t, t. Fig. 94). These ap- 

 pear to replace the swarm-spores of other seaweeds, and 

 may also be compared to the conidia of certain fungi ; they 

 are destitute of cilia, and are, as a consequence, not loco- 

 motive. 



308. The sexual organs consist of carpogones and an- 

 therids. The latter are situated singly or in groups on the 

 ends of branches {A and B, a, a, Fig. 95). The anthero- 

 zoids are small round bodies which are destitute of cUia 



Fig. 95.— Sexual reproduction of Red Seaweeds. A (Lejolisia) : a, an- 

 therid ; x\ antherozoids ; /), carpogone, with anthevozoids attached to the 

 trichogyne ; s, section of ripe spore-fruit, from which a spore (fruit-spore) 

 IS escaping. B (Nemalion) : a, antherid, and antherozoids: b, carnoeone 

 13 and IB, development of spore-fruit. Magnified 150 times. *• e . 



{A, X, Fig. 95), and are carried about by currents of water, 

 and in this way brought to the carpogones. 



309. The carpogones are somewhat variable as to their 

 complexity, being much more simple in the lower orders 

 than in the higher. In some cases (Nemalion) the carpo- 



