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o 3
MICROSCOPIC FUNGI.
wkicli are derived from tlie
spermogones^ and
wldch have not yet been known to germinate ;
Stylospores, produced either singly^ or in bead-like,
or moniliform^ strings, and whicli either precede or
are associated with the true spores ;
some-
Sporesj
times simple, but often complex ;
and S;poridiaj or
secondary sporules, which are produced
on the
germinating threads of the true spores.
The various genera of these endophytes owe
their distinctions to the form, or mode of development
of their true spores. In one instance these
spores are united in pairs, or divided by a septum,
so that they are two-celled : these are named Puccinia.
In another instance the spores are onecelled,
and at first borne upon a stalk or peduncle^,
from which they are detached in ripening
: suck
are called Trichohasis, It is unnecessary here to
indicate all the variations to illustrate the fact that
the generic distinctions are based upon the characters
of the true spores. How unsatisfactory
such a mode will appear, when subjected to experience
day by day, a botanist would suspect. In
the same pustule, resting upon the same cushion of
mycelium, the spores of an Aregma wiU be found
with those of a Lccytliecif and those of a Puccinia
Avith Trichohasis, More than this has even been
affirmed. The alternation of generations, known
to students in the animal world, is
here repeated in
the vegetable. Dr. de Bary declares that certain
data appear to indicate that j^cidium constitutes