very
fine and delicate. In other orders the double coating of the spore has
been demonstrated. When the spore is coloured, the external membrane
alone appears to possess colour, the endospore being constantly
hyaline. It may be added here, that in this order the spore is simple
and unicellular. In _Lactarius_ and _Russula_ the trama, or inner
substance, is vesicular. True latex vessels occur occasionally in
_Agaricus_, though not filled with milk as in _Lactarius_.

[Illustration: FIG. 4.--_Polyporus giganteus_ (reduced).]

POLYPOREI.--In this order the gill plates are replaced by tubes or
pores, the interior of which is lined by the hymenium; indications
of this structure having already been exhibited in some of the
lower _Agaricini._ In many cases the stem is suppressed. The
substance is fleshy in _Boletus_, but in _Polyporus_ the greater
number of species are leathery or corky, and more persistent. The
basidia, spicules, and quaternate spores agree with those of
_Agaricini_.[L] In fact there are no features of importance which
relate to the hymenium in any order of _Hymenomycetes_ (the
_Tremellini_ excepted) differing from the same organ in _Agaricini_,
unless it be the absence of _cystidia_.

[Illustration: FIG. 5.--_Hydnum repandum._]

HYDNEI.--Instead of pores, in this order the hymenium is spread over
the surface of spines, prickles, or warts.[M]

AURICULARINI.--The hymenium is more or less even, and in--

CLAVARIEI the whole fungus is club-shaped, or more or less intricately
branched, with the hymenium covering the outer surface.

[Illustration: FIG. 6.--_Calocera viscosa._]

[Illustration: FIG. 7.--_Tremella mesenterica._]

TREMELLINI.--In this order we have a great departure from the
character of the substance, external appearance, and internal
structure of the other orders in this family. Here we have a
gelatinous substance, and the form is lobed, folded, convolute, often
resembling the brain of some animal. The internal structure has been
specially illustrated by M. Tulasne,[N] through the common species,
_Tremella mesenterica_. This latter is of a fine golden yellow colour,
and rather large size. It is uniformly composed throughout of a
colourless mucilage, with no appreciable texture, in which are
distributed very fine, diversely branched and anastomosing filaments.
Towards the surface, the ultimate branches of this filamentous network
give birth, both at their summits and laterally, to globula