The Classification of the Alga. 



117 



thallophytes. 

 First Class. 

 Protophytes. 

 Chlorophyll in plant cells. Plant cells without Chlorophyll. 



Cyanophyceae. 

 Palmellaceae. 



Schizomyceteae. 

 Saccharomvceae. 



Second Class. 

 Zygospores. 

 Conjugation of moving cells, 

 Volvocineae, 



( Hydrodict}-eae ). 



Conjugation of resting cells 

 Conjiigateae, 

 (including Diatomaceaei. 



Third Cl.-i~ 

 Oosporece. 



Mvxomvceteae. 



Zvsromvceteae. 



Sphaeropleae. 

 Vaucheriaeae. 

 CEdogoniese. 

 Fucaceae. 



Saprolegnieae. 

 Peronosporeae. 



Fourth Class. 

 Carposporea. 



Colochaeteae. 

 Floridiese. 



I red marine Algae). 

 Characea?. 



Ascomyceteae. 



(including Lichens), 

 ^^cidiomyceteas. 

 Basidiomvceteae. 



THE PBOTOPHYTZS. 



These are the simplest plants known. They consist of single, 

 separated cells {Glavcapsa, Protococcus), or cells arranged in a 

 series like a string of beads {Xostoc), or cells which have subdi- 

 vided in both directions in one plane (JferisMopeifia). They are 

 divided into two groups : those whose chlorophyll is pure green 

 {Palmella Protococcus^, and those with chlorophyll tinged blue 

 or 3-ellow {Nostot, Rii-ularia, Oscillaria, etc.). 



In this class true reproductive organs have not been ob- 

 sened. The increase of individuals takes place commonly by 

 the self-division of the vegetable cell, not by the production of 

 cells especially designed for that office. Vegetative and repro- 

 ductive organs are not as yet differentiated, and only in the 

 most highh" developed species are there cells which seem to be 



