Elementary botany . Fig. 232.Agaricus campestris. View of under side showing stem, annulus, gills, and margin of pileus.. Fig. 233-Agaricus campestris. Longitudinal section through stem and pileus. a, pileus; 6, portionpf veil on margin of pileus ; c, gill; /, fragment of annulus ; e, stipe. FUNGI: MUSHROOMS. 201 shorter ones. Around the stem a little below the gills is a collar,termed the ring or annulus. 421. Fruiting surface of the mushroom.—The surface ofthese gills is the fruiting surface of the mushroom, and bears thegonidia of the mushroom, which are dark purplish brown whenmature, and
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Elementary botany . Fig. 232.Agaricus campestris. View of under side showing stem, annulus, gills, and margin of pileus.. Fig. 233-Agaricus campestris. Longitudinal section through stem and pileus. a, pileus; 6, portionpf veil on margin of pileus ; c, gill; /, fragment of annulus ; e, stipe. FUNGI: MUSHROOMS. 201 shorter ones. Around the stem a little below the gills is a collar, termed the ring or annulus. 421. Fruiting surface of the mushroom.—The surface ofthese gills is the fruiting surface of the mushroom, and bears thegonidia of the mushroom, which are dark purplish brown whenmature, and thus the gills when old are dark in color. If we makea thin section across a few of the gills, we see that each side ofthe gill is covered with closely crowded club-shaped bodies, eachone of which is a basidium. In fig. 234 a few of these are en-larged, so that thestructure of the gillcan be seen. Eachbasidium of the com-mon mushroom has