Across the cap belong to Agaricus arvensis, called from its large size and coarse texture the horse mushroom, which grows in meadows and damp shady places, and though generally wholesome is coarse and sometimes indigestible.
Many other species of Agaricus more or less resemble A.
Rotting of the wood at the base of the trunk is also caused by Agaricus melleus, which spreads from root to root in the soil by means of its long purple-black, cord-like mycelial strands known as Rhizomorpha.
They are beautiful objects in the autumn woods; Amanita muscaria, the fly fungus, formerly known as Agaricus muscarius, being especially remarkable by its bright red cap covered with white warts.
A bed of Agaricus was found by the writer near the river Styx; and upon this hint an attempt has been made to propagate edible fungi in this locality.
The curious little edible Agaricus esculentus, although placed under the sub-genus Collybia, is allied by its structure to Marasmius.
Many edible fungi depend upon minute and often obscure botanical characters for their determination, and may readily be confounded with worthless or poisonous species; but that is not the case with the common mushroom, for, although several other species of Agaricus somewhat closely approach it in form and colour, yet the true mushroom, if sound and freshly gathered, may be distinguished from all other fungi with great ease.
Outflows of resinResinosisalro come under this general heading; but although some resin-fluxes are traced to the destructive action of Agaricus melleus in Conifers, others, as well as certain forms of Gummosis, are still in need of explanation.