HABITATS. 945 
others, we have examples of one spheeriaceous fungus growing 
upon another. 
Mr. Phillips has recently indicated the species of fungi found 
by him on charcoal beds in Shropshire,* but, useful as it is, that 
only refers to one locality. A complete list of all the fungi 
which have been found growing on charcoal beds, burnt soil, 
or charred wood, would be rather extensive. The fungi found 
in hothouses and stoves are also numerous, and often of con- 
siderable interest from the fact that they have many of them 
never been found elsewhere. Those found in Britain,f for in- 
stance, are excluded from the British Flora as doubtful, because, 
growing upon or with exotic plants, they are deemed to be of 
exotic origin, yet in very few cases are they known to be inha- 
bitants of any foreign country. Some species found in such 
localities are not confined to them, as Agaricus cepestipes, 
Agaricus cristalus, Aithalium vaporarium, &c. It is somewhat 
singular that certain species have a predilection for growing in 
proximity with other plants with which they do not appear to 
have any more intimate relation. Truffles, for instance, in asso- 
ciation with oaks, Peziza lanuginosa under cedar-trees, Hyd- 
nangium carneum about the roots of Eucalypti, and numerous 
species of Agaricini, which are only found under trees of a par- 
ticular kind. As might be anticipated, there is no more fertile 
habitat for fungi than the dung of animals, and yet the kinds 
found in such locations belong to but a few groups. Amongst 
the Discomycetes, a limited number of the genus Pezizs are 
fimicolous, but the allied genus Ascobolus, and its own imme- 
diate allies, include amongst its species a large majority that are 
found on dung. If we take the number of species at sixty-four, 
there are only seven or cight which do not occur on dung, whilst 
fifty-six are fimicolous. The species of Spheria which are found 
on the same substances ure also closely allied, and some Conti- 
neutal authors have grouped them under the two proposed 
* ‘Gardener’s Chronicle,” 1874. 
* W. G. Smith, in ‘‘ Journ. Botany,” March, 1873; Berkeley, in ‘‘ Grevillea,” 
vol. i. p. 88. 
