CHLOROPHYCEJE 



171 



densely branched in all directions without possess- 

 ing any main axis. It forms gelatinous cushions 

 or irregularly globular masses. Bolbocoleon has a 

 creeping thai 1 us of rows of cells without erect 

 branches, though the cells exhibit an upward pro- 

 tuberance. Small conical cells, ending upwards in 

 fine bristles, and with very little colouring matter, 



FIG. 53. Bolbocoleon piliferum. a, filament with hairs; b, cells with 

 zoospores. Highly magnified. (After Pringsheim.) 



occur on and between the ordinary vegetative cells. 

 Entodcrma grows as an endophyte within the mem- 

 branes of other Algae ; it is irregularly branched, and 

 sometimes is developed after numerous cell-divisions 

 into a kind of tissue-mass. The divisions as a rule, 

 however, take place only in the pointed terminal 

 cell. Epidadia is a creeping epiphyte on the surface 

 of Flusim and other Bryozoa, and in many respects 



