_Haeatococcus_ and plasmodium come under the classes algae and fungi of
the Thallothyta group. The division[4] of this group into two classes
is based upon the presence of chlorophyl in algae and its absence in
fungi. Gelatinous starch is found in the algae; the fungi contain a
starchy substance called glycogen, which also occurs in the liver and
muscles of animals. Structureless bodies, as _aethalium_, contain no
true sugar. Stratified starch[5] first appears in the phanerogams.
Alkaloids have been found in fungi, and owe their presence doubtless
to the richness of these plants in nitrogenous bodies.
In addition to the green coloring matter in algae are found other
coloring matters.[6] The nature[7] of these coloring matters is
usually the same through whole families, which also resemble each
other in their modes of reproduction.
In form, the algae differ greatly from filaments or masses of cells;
they live in the water and cover damp surfaces of rocks and wood. In
these they are remarkable for their ramifications and colors and grow
to a gigantic size.
The physiological functions of algae and fungi depend upon their
chemical differences.
These facts have been offered, simple as they are, as striking
examples of chemical and structural opposition.
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