10 VEGETABLE PHYSIOLOGY 



they form the group known as the Myxomycetes or slime- 

 fungi. One species, Mlwlium, is found frequently among 

 the refuse of tanyards and is known as ' flowers of tan.' 

 These fungi pass the greater part of their life without 



FIG. 11. VOLVOX GLOBATOB. (After Kny.) x 120. 

 A, section of a portion of the wall of tho sphere. X 1000. 



possessing any cell-walls, only forming them indeed in con- 

 nection with their processes of reproduction. 



A third mode of arrangement of a colony of proto- 

 plasts is found in the so-called Coenocytes (fig. 12). In this 

 type of structure which is represented by several very 



