“A rosebush,” objected Jules, “has stout branches covered with leaves; the mushroom-plant, according to what I see, has nothing of the sort. It is a kind of moldiness that branches out in the ground in white veins.” “Those white veins, so delicate that one can hardly touch them without breaking them, form the subterranean plant, without leaves or roots. They lengthen little by little in the ground to a pretty good distance from the point of departure. Then, at a favorable moment, they produce little swellings which grow under ground, become mushrooms, and burst open their bed of earth to expand in the air. This structure explains to us why mushrooms grow in groups. Each group, with the mycelium that produces it, constitutes one and the same plant.” “I have seen groups of mushrooms in a perfect circle,” Claire remarked. “If the ground is of uniform character and nowhere hinders the propagation of the subterranean vegetable in one direction rather than in another, the mycelium spreads equally on all sides, and so produces circular groups of mushrooms, which the country people sometimes call witches’ circles.” “Why witches’ circles?” asked Jules. “The ignorant and superstitious think they see an effect of witchcraft in this curious circular arrangement, whereas it is but the natural result of the uniformly equal development of the subterranean plant.” “Then there are no witches?” said Emile. “No, my dear. There are rogues who abuse the credulity of others; there are simpletons disposed to listen to them; but no one has preternatural powers.” “Since a mushroom is the blossom of a subterranean plant, of the mycelium, as you call it, must it not have stamens, pistils, ovaries?” Jules inquired. “A mushroom is in its way the blossom of a kind of vegetable, but its structure has nothing in common with that of ordinary flowers. It is a structure of a special sort, very complicated, very curious, which I shall pass by in silence so as not to overcharge your memory. “The chief function of a flower, you know, is to produce seeds. Well, the mushroom too produces seeds, but so small, so different from others, that they have a special name,—spores. Spores are the seed of the mushroom, just as acorns are the seed of the oak. That is worthy of some further explanation. [Illustration: Mushrooms] “The mushrooms most familiar to us are composed of a sort of dome supported by a stalk. This dome is called the cap. The under side of the cap takes various shapes, of which the principal are these: Sometimes it is composed of gills which radiate from the center to the border; sometimes it is pierced by an infinity of little holes, which are the orifices of as many tubes joined together in a common mass; sometimes it is covered with fine points like those of a cat’s tongue.