he last, _A. Gardneri_, Berk., is
produced in the Brazilian province of Goyaz, upon dead leaves. As to
the _Dematium violaceum_, Pers., the _Himantia candida_, Pers., cited
once by Link, and the _Thelephora caerulea_, D. C. _(Corticium
caeruleum_, Fr.), Tulasne is of opinion that their phosphorescent
properties are still problematical; at least no recent observation
confirms them.

The phosphorescence of _A. olearius_, D. C., appears to have been
first made known by De Candolle, but it seems that he was in error in
stating that these phosphorescent properties manifest themselves only
at the time of its decomposition. Fries, describing the _Cladosporium
umbrinum_, which lives upon the Agaric of the olive-tree, expressed
the opinion that the Agaric only owes its phosphorescence to the
presence of the mould. This, however, Tulasne denies, for he writes,
"I have had the opportunity of observing that the Agaric of the olive
is really phosphorescent of itself, and that it is not indebted to any
foreign production for the light it emits." Like Delile, he considers
that the fungus is only phosphorescent up to the time when it ceases
to grow; thus the light which it projects, one might say, is a
manifestation of its vegetation.

"It is an important fact," writes Tulasne, "which I can confirm, and
which it is important to insist upon, that the phosphorescence is not
exclusively confined to the hymenial surface. Numerous observations
made by me prove that the whole of the substance of the fungus
participates very frequently, if not always, in the faculty of shining
in the dark. Among the first Agarics which I examined, I found many,
the stipe of which shed here and there a light as brilliant as the
hymenium, and led me to think that it was due to the spores which had
fallen on the surface of the stipe. Therefore, being in the dark, I
scraped with my scalpel the luminous parts of the stipe, but it did
not sensibly diminish their brightness; then I split the stipe,
bruised it, divided it into small fragments, and I found that the
whole of this mass, even in its deepest parts, enjoyed, in a similar
degree to its superficies, the property of light. I found, besides, a
phosphorescence quite as brilliant in all the cap, for, having split
it vertically in the form of plates, I found that the trama, when
bruised, threw out a light equal to that of their fructiferous
surfaces, and there is really only the superior surface of the pileus,