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The 31icro-Organisms of the Human Mouth.
CHAPTER I.
INTRODUCTORY.
FuxGi belong to that class of Cryptogamia which arc desig-
nated as Thallophyta (Thallophvtes).
Their position in the vegetable kingdom may be indicated by
the following classification
Cryptogams, Thallophytes, I Alga?,
f f
I flowerless plants ) (. Lichens.
-^^'^^.^
reproducing chietiv
'
" }
^ Cryptogams.
by spores.
I
Plants.
{
Phanerogams,
I
I fiowerino; i:)lants
°
I
reproducing by
seeds.
l^
The Cryptogams difler from the Phanerogams in th3 absence
of flowers, and in that they do not propagate themselves by
means of seeds, in which the future plant is already present in
embryo, but by means of spor^-S, i.e. by simplj bodies or cells,
which show no ditferentiatioa corresponding to the parts of the
future plant.
As leaf-bearing Cryptogams, we designate those spore-forming
1 1
The 31icro-Organisms of the Human Mouth.
CHAPTER I.
INTRODUCTORY.
FuxGi belong to that class of Cryptogamia which arc desig-
nated as Thallophyta (Thallophvtes).
Their position in the vegetable kingdom may be indicated by
the following classification
Cryptogams, Thallophytes, I Alga?,
f f
I flowerless plants ) (. Lichens.
-^^'^^.^
reproducing chietiv
'
" }
^ Cryptogams.
by spores.
I
Plants.
{
Phanerogams,
I
I fiowerino; i:)lants
°
I
reproducing by
seeds.
l^
The Cryptogams difler from the Phanerogams in th3 absence
of flowers, and in that they do not propagate themselves by
means of seeds, in which the future plant is already present in
embryo, but by means of spor^-S, i.e. by simplj bodies or cells,
which show no ditferentiatioa corresponding to the parts of the
future plant.
As leaf-bearing Cryptogams, we designate those spore-forming
1 1
