/ 



)/■ 



i:f^_ 



process ■"°'^«' 



I 



and J 



of 



vision i 



^Sain, 



ifi, 



'^ ^loss- 



*' coitime 



IS thus 



s 



seen 



need 



So 



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y 



'^ -^ 



■se 



all 



as 



?'^' '^ ^o^e oft 



^lay be the 

 scarcely to 

 ^i^d contents;' 

 'SO as at last to 

 ■ ^vere the products ( 

 ? discriminated 



t 





K' 



Mh 



gomdia,butthejetf[ 

 ncy to keep on 



e of grow 



:ed. Dr.Hidss:. 

 anv one who will 



ecov 



eredbythef 



r 



a long pen 



) 



as 



i 

 I 



., be noticed i 

 underneath &• 



V, that 



)COCCUS 



-like 1)0^«^ *■ 



,f the pfO 



filament^;, 



undergo 



•pU-^^'^''^ nil ■' 



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bis 



010 



de 



of 



APPENDIX D. 



Ixix 



been seen more particularly on the bark of trees, and by 

 this means large green patches may be formed. 



5. * But in some filaments there is a still more unsuspected 

 change, namely, in the production of cells of Gleocapsa. 

 The segmentation proceeds within the filament, as in the 

 instance just quoted ; but the divisions become invested in 

 a gelatinous envelope, while the parent cell-wall breaks up. 

 These Gleocapsa-like bodies then become free, and continue 

 the segmentation process as in Gleocapsa, This I have 

 shown in PI. LVIIL fig. iga. It is a condition by no 

 means rare in the winter months; considerable masses of 

 these bodies are to be found so produced. 



« • « 



I have fre- 

 quently found Gleocapsa polydermica (Kiitzi'ng) formed, as 

 well as other so-called species. After frequent segmentation, 

 the cells are imbedded in an indefinite mass of gelatinous 

 substance/ 



" The merely accidental nature, so to speak, of the differ- 

 ence between the Chlorococcus product and the Gleocapsa 

 product of the confervoid filament of the Moss is well seen 



F 



by what occurs in certain filaments where there may be a 

 simultaneous production of the two forms side by side. In 

 reference to this. Dr. Hicks writes : — ' The cells of a fila- 



\ 



IP 



far as Icani^^l i^ient in one or in every part at once begin the process of 



quaternary segmentation, as before noticed, at first regularly, 

 but shortly after irregularly ; besides this, a certain amount 

 of free-cell formation goes on within the divisions (mother- 

 cells), so that it is difficult to say which kind of cell forma- 

 tion predominates. In this manner large irregular masses 

 of segmentation cells are produced, like some of those re- 

 sulting from the segmentation of the so-called Palmellaceae. 

 The cells set free from them are either Chlorococcus-like 

 cells of variable size, or they are like Gleocapsa, undergoing 



segmentation in their variable manner. 



• • • 



These changes 



<;an be readily observed in the colder months. They fre- 



