104 FLOWERLESS PLANTS 



but very attractive example, \\ith its branch- 

 ing stems, which at their tips resemble so many 

 miniatiire ostrich feathers. ^Nlanj' of the Calli- 

 thamniums grow on the larger kinds of bro\\Ti 

 seaweed, as well as on rocks and stones. 



The manner of reproduction in the case of 

 many species of red seaweeds is not fully under- 

 stood. On some kinds spores are produced in 

 little cases, and it is often possible to discover 

 these on the leaves, notably in the case of 

 Delesseria. These after floating about in the 

 water for awhile come to rest at last and 

 develop into the new plant. In other species, 

 however, it has been demonstrated that sexual 

 organs are borne on the leaves, and the 

 blending of the elements will give rise to masses 

 of spores which will ultimately develop into the 

 mature plant. 



