!h. 



J I- 



t 



THE GE^US CHLOROCHYTRIUM, 



7 



the instability of these characters in the forms that have come under my 

 observation U far too conspicuous to justify tlieir being regarded as the sole 

 bases of specific distinction in other nearly rekted forms. Hence, the only 

 logical coarse to adopt is to merge the four species into one under the 

 name Chloroclifjtrbim Lemmv. Whether the cells of C. pallidum^ Klebs, are 

 sufficiently constant in size to justify its being regarded as a s[)ecial variety 

 under tlie name C. Lemnce, Cahn, var, pallidum, Klebs, or whether it is 

 merely a " place-variety" of the typical form, as Klebs and Freeman have 



Text-figure 1. — Chhrochytrinm Lemuel in leaves o^ Bryum pseiuhtruiuetnun, 



F 



A. Part of Bryum leaf with endophytic ChlorocJiytrlum cells, XlJ:4; E <fe C, Individual 



Chorochytriuni cells^ showing button-like excrescence and form of chloroplast : tlie 

 endophjte has caused a splitting; apart and crushiJiy; of the adjacent Bryiivi cells, 

 Xo35» [N.B. — Details of internal structure of Bryum cells omitted.] 



r m 



suggested, is a question of little importance, and could only be determined 

 from a prolonged study of the living alga. That the size of the cellulose 

 stopper is subject to variation is shown by the different statements made by 

 Kny and by Szynianski with respect to the " species " C. Knyaniim. 



In this connection it is interestinij to note that a form of C Lemaa\ 

 recently sent to the Laboratory for identification, occurred in the leaves of 



