THE ALGsE. 



347 



By the sides of the brook a much coarser variety, called Cladop/wra 

 crispata, appears, which is frequently a troublesome pest where we 

 grow plants in pans of water in our greenhouses. The fibres are 

 visible to the naked eye, and are branched, and not continuous, as 

 those of C. nvularis are. Fig. 

 800 shows these fibres of the 

 natural size, and also when 

 magnified 100 diameters. In 

 our Central stream and in our 

 Backwater, in winter and in 

 early spring, we have numerous 



Specimens Of the beautiful frog's FIG. 800. Cladophora crispata, nat. size and x 100 diam. 



spawn conferva, the BatracJwspermum moniliforme (fig. 80 1), which 

 is figured the natural size, and also when it is magnified IOO 

 diameters. It is a much-esteemed object for the microscope. It is 

 not a universal plant in streams, but enough grows in rny garden to 

 supply all the microscopists in England. It adheres to the stones in 

 water about a foot deep. 



Fu,. 801. Katrachospermum njoniliforme, nat. size and x 100 diam. 



FJO. 802. Cladophora 



glotnerata, nat. size 



and x loo diam. 



Contrasting with this, which is of a dark colour, we observe here 

 and there small quantities of the most brilliant grass-green wavy 

 patches. This is the Cladophora glomerata (fig. 802), and a truly 

 magnificent microscopic object it is. The arrangement of its fibres 

 is barely visible to the eye ; when, however, it is magnified 100 dia- 

 meters, it shows well its branched form, and when further enlarged 

 it exhibits its more intimate structure. 



