KEY FOR THE PLANT KINGDOM 



Organisms without chlorophyll, the vegetative body a naked mass of proto- 

 plasm with many nuclei ; reproduction asexual, spores free or enclosed in 

 sporangia ; spores produce motile swarm spores or amoeboid bodies. 



A. Myxothallophyta. 158 



Cells generally with cell membrane, with one or more generations; sexual 

 reproductions frequently absent, the fertilized spores when present with one cell, 

 which later separates from the mother plant, or a several celled body resulting 

 from the fertilization of the female fructifying body, which later develops into 

 a new plant. B. Euthallophyta. 160 



Small unicellular organisms, never green but frequently of other colors, 

 blue greens, etc. ; reproduction asexual by fission ; spores formed in the interior 

 of the cell or by transformation of vegetative cells into the endospores or 

 arthrospores ; nuclei absent, but a so-called "Central body" occasionally present; 

 coloring matter equally distributed. I. Sclnzophyta. 160 



Unicellular organisms generally colorless at least never green; membrane, 

 consisting of a chitin-like substance, occasionally gelatinous ; cells frequently 

 with cilia ; reproduction by fission ; spores when present endospores or arthro- 

 spores. Schizomycetes. 161 



Unicellular organisms like the preceding, cells contain chlorophyll and 

 phycocyanin consisting of blue, blue-green, violet, or reddish pigments; swarm 

 spores absent. Schizophyceae. 184 



One-celled organisms with nucleus sharply differentiated; protoplasmic body 

 with a simple denser protoplasmic membrane, pseudopodia absent, motile during 

 most of their existence; cilia 1 or more, and with 1 or 2 pulsating vacuoles; 

 chromatophores occasionally absent; reproduction asexual by longitudinal 

 division. II. Flagellatae. 188 



Plants occurring mostly in water, always with cell-membrane and nucleus; 

 green or other colors (brown or red) mixed with the green. 



III. Euphyceae. 188 



Small unicellular organisms occasionally forming chain-like colonies. Cells 

 possess two long cilia which arise from a furrow in the ventral surface. Found 

 mostly in the plankton of salt water. Peridinales. 188 



Small one-celled organisms of brown color, the chlorophyll masked by 

 diatomin found in chromatophores; cell-wall consisting of silica with a girdle 

 and fine lines; reproduction asexual; division parallel to the long axis of the 

 organism, and the formation of auxospores and sexual, by the formation 

 of auxospores by conjugation. Bacillariales. 188 



Chlorophyll green algae ; membrane without silica : reproduction by division, 



