[Illustration: Plate A. HYMENOMYCETES. Agaricus (Psalliota) campester. T. Taylor, del.] In Plate A is presented a sketch of the common field mushroom, Agaricus campester. Fig. 1 represents the mature plant; Fig. 2, a sectional view of the same; Fig. 3, the basidia, club-shaped cells from the summit of which proceed the slender tubes called sterigmata, which support the spores--highly magnified; Fig. 4, the sterigmata; Fig. 5, the mycelium, highly magnified, supporting immature mushrooms; Fig. 6, the spores as shed from an inverted mushroom cap; Fig. 7, spores magnified.…
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