THE FIKST-TIDE POOL. 39 



rozoides meet the spores in the water directly after 

 they issue from the receptacle. 



To observe this, take an olive green receptacle, which 

 is the female, and set free a few spores in a drop of 

 sea water in a shallow cell ; then liberate a few ripe 

 filaments from an orange yellow receptacle, which will 

 contain the anther ozoides, and the whole process of 

 fertilization may be watched with a power of 250 dia- 

 meters. 



Then, if you wish further to prove the subsequent 

 process of germination, a little care and patience will 

 enable these very spores to grow from the cell of what 

 is called a " growing slide," or even in a tumbler of 

 water fresh and still, by drawing it off with a siphon, 

 and renewing it daily in the same gentle way. 



ELACHISTEA. 



(The name seemingly from a Greek word signifying " the least." They 

 are all parasitic plants.) 



Elachistea Euciola. — This is a parasitic plant 

 of no use to the collector, but very interesting to the 

 microscopist. It is found as small olive-coloured tufts 

 on Fucus Nodosus and Fucus Serratus ; triple-jointed 

 filaments, with stalked spores affixed to the base of the 

 filaments. 



Elachistea Flaccida is found on Cystoseira. 



Flachistea Stellulatce is parasitic on Dictyota. 



Flachistea Scutulata on Himanthalia. 



Elachistea Velutina also on Himanthalia. 



Elachistea Fulvinata on Cystoseira. 



