THE 



205 



germinates, sending out a root-hair at one end and 

 dividing up at the other to form a filament, as shown 

 in Fig. 88, B. This mode of propagation is almost 





FIG. SS.CallitTiamnion corymlosum. A, part of an asexual 

 plant, bearing tetrasporangia ; the branches terminate in 

 long colourless hairs ; t (on left), tetrasporangium containing 

 the tetrahedrally arranged spores ; ts, empty sporangium, from 

 which the tetraspores (t) are just discharged. B, germinat- 

 ing tetraspores. C, part of a female plant, bearing two 

 cystocarps (cp], both of which are the product of a single 

 procarpium. Magnified about 80. (After Thuret and 

 Bornet.) 



universal among red seaweeds, but the position of the 

 tetrasporangia and the arrangement of the tetraspores 

 in each vary greatly 



