Gleocapsa 



Osdllatoria 



Nostoc 



SanjgQssum Laminana Didtoim 



Polysipbonia 



A. MAIN GROUPS OF PLANTS 



The chief groups of plants are indicated in the following outline. As one be- 

 comes acquainted with more plants, it becomes necessary to use a more complete 

 classification. 



PHYLUM I THALLOPHYTES ("bud or shoot plants"). Plants showing no 

 differentiation into true stem and leaf; include the smallest as well as the largest 

 plants in the world. The thallophytes have little in common except the absence 

 of distinct roots, stems, and leaves. All thallophytes, except the Class schizo- 

 phytes, reproduce sexually, that is by the fusion of protoplasm from two sources. 

 The schizophytes reproduce only by the simple division of protoplasm into two 

 masses. The presence or absence of chlorophyl distinguishes the two divisions of 

 the schizophytes; and it distinguishes the other two Classes of thallophytes— 

 the algae and the fungi. 



CLASS 1 SCHIZOPHYTES ("splitting plants"). Each cell splits into two; 

 "^ no other mode of reproduction. 



Order 1 Cyanophyceae ("blue seaweed"). Splitting plants with 

 chlorophyl— the "blue-green algae". Examples, Oscillatoria, Rivu- 

 laria, Nostoc. 



Order 2 Schizomycetes ("splitting fungus"). Splitting plants with- 

 out chlorophyl— the bacteria (see illustration, p. 613). 



CLASS 2 ALGAE ("seaweeds"). The chlorophyl-bearing thallophytes; all 

 live in water or in moist places. 



Order 1 Chlorophyceae ("green seaweed"). The green algae; 

 usually yellowish green. Examples, pleurococcus, desmids, stonewort, 

 sea lettuce, spirogyra (see illustration, p. 375). 



Order 2 Phaeophyceae ("dusky seaweed"). The brown algae; 

 mostly marine. Examples, Laminaria Sargassum, giant kelp, sea palm, 

 bladder wrack (see illustration, p. 111). 



Shelf fungus 



(Po//ponis) 



Water mold 



TrufQe 



Edible moiel 



Black knot 



Ergot Com smut 

 ton rye) 



Boletus 



688 



