236 



i'LANT STUDIES 



upon the return of favorable conditions. These may be 

 regarded as resting cells. So notable is the fact of rejiro- 

 duction by fission that Cyanophyceas are often separated 

 from the other groups of Algas and spoken of as " Fission 

 Algse," which j)ut in technical form becomes Schizojohyceas. 

 In this particular, and in several others mentioned above, 

 they resemble the " Fission Fungi " (Schizomyeetes), com- 

 monly called " bacteria," so closely that they are often 

 associated with them in a common group called " Fis- 

 sion plants" (Schizopliytes), distinct from the ordinary 

 AlgEB and Fungi. 



2. CiiLOROPHYCEJ-; {Green ^Uijce). 



163. Pleurococcus. — This may be taken aa a type of one- 

 celled Green Alga?. It is most commonly found in masses 

 covering damp tree-trunks, etc., and looking like a green 

 stain. These fine- 

 ly granular green 

 masses are found 

 to be made wp 

 of multitudes of 

 spherical cells re- 

 sembling those of 

 Glceoc(q)s(C, except 

 that there is no 

 blue with the chlo- 

 rophyll, and the 

 cells are not im- 

 bedded in such 

 jelly-like masses. 

 The cells may be 

 solitary, or may 

 cling together in 



colonies of va,rions sizes (Fig. ".'(I I). Like Glo'dciijisit, a cell 

 divides and forms two new cells, the only reproduction 



Fic.-Jlll, Tl, iirnorviis. ii niK-crllcil yrrc'ii alKa : A. nh.uv- 

 iiiU the adiill Innn with its iiiicirns ; /;, r. /i, E, 

 various slaL^rs ol' fij\■i>i(llMtis^i^)ln in iirndiiciii;^' new 

 clis ; F. cnliinics (.f (alls \\1ik1i ha\e rriiiaiiuil in 

 contact. — (_'.\LUWELL. 



