The three mushrooms illustrated and described in this pamphlet, [Plates I], [II], and [III], are of the order Agaricini or gilled mushrooms. They are well-defined types and of wide geographical distribution.
FOOD VALUE OF MUSHROOMS.
Rollrausch and Siegel, who claim to have made exhaustive investigations into the food values of mushrooms, state that "many species deserve to be placed beside meat as sources of nitrogenous nutriment," and their analysis, if correct, fully bears out the statement. They find in 100 parts of dried Morchella esculenta 35.18 per cent. of protein; in Helvella esculenta, 26.31 per cent. of protein, from 46 to 49 per cent. of potassium salts and phosphoric acid, 2.3 per cent. of fatty matter, and a considerable quantity of sugar. The Boletus edulis they represent as containing in 100 parts of the dried substance 22.82 per cent. of protein. The nitrogenous values of different foods as compared with the mushroom are stated as follows: "Protein substances calculated for 100 parts of bread, 8.03; of oatmeal, 9.74; of barley bread, 6.39; of leguminous fruits, 27.05; of potatoes, 4.85; of mushrooms, 33.0."
According to Schlossberger and Depping, in 100 grams of dried mushrooms they found the following proportions of nitrogenous substances:
| Varieties. | Grains. |
|---|---|
| Chanterelles | 3.22 |
| Certain Russulas | 4.25 |
| Lactarius deliciosus | 4.68 |
| Boletus edulis | 4.25 |
| Meadow mushroom | 7.26 |
But all chemists are not agreed as to these proportions. For instance, Lefort has found 3.51 grains of nitrogenous matter in the cap of Agaricus campestris, 2.1 grains in the gills and only 0.34 of a grain in the stem. Payen has found 4.68 grains in Agaricus campestris, 4.4 grains in the common Morel (Morchella esculenta), 9.96 grains in the white truffle, and 8.76 grains in the black.
A much larger proportion of the various kinds of mushrooms are edible than is generally supposed, but a prejudice has grown up concerning them in this country which it will take some time to eradicate. Notwithstanding the occurrence of occasional fatal accidents through the inadvertent eating of poisonous species, fungi are largely consumed both by savage and civilized man in all parts of the world, and while they contribute so considerable a portion of the food product of the world we may be sure their value will not be permanently overlooked in the United States, especially when we consider our large accessions of population from countries in which the mushroom is a familiar and much prized edible. In Italy the value of the mushroom as an article of diet has long been understood and appreciated. Pliny, Galen, and Dioscorides mention various esculent species, notably varieties of the truffle, the boletus and the puff-ball, and Vittadini writes enthusiastically of the gastronomic qualities of a large number of species. Of late years large quantities have been sold in the Italian markets. Quantities of mushrooms are also consumed in Germany, Hungary, Russia, France, and Austria.
Darwin speaks of Terra del Fuego as the only country where cryptogamic plants form a staple article of food. A bright-yellow fungus allied to Bulgarin forms, with shellfish, the staple food of the Fuegians. In England the common meadow mushroom Agaricus campestris is quite well known and used to a considerable extent among the people, but there is not that general knowledge of and use of other species which obtains in Continental Europe.
In the English-speaking countries much has been done by the Rev. M. J. Berkeley, Dr. M. C. Cooke, Worthington G. Smith, Rev. John Stevenson, Prof. Hay, Prof. Chas. H. Peck, Prof. W. J. Farlow, and others, including the various mushroom clubs, to disseminate a more general knowledge on this subject.