. Botany of the living plant. Botany; Plants. 444 BOTANY OF THE LIVING PLANT 341,343-) The apparently fresh formation of mushrooms from day to day in the fields is thus accounted for. The button-mushrooms are hidden in the grass till the extension takes place. t sh , h. Fig. 344. Structure of the hymeniumof the Mushroom Psalliota (Agaricus) campestris. A is a vertical section through the pileus traversing several gills (/). B shows the structure of one gill more highly magnified : hy = the hymenium. C shows a small area of the hymenium in section ( x 350). The basidia project, each bearing two
. Botany of the living plant. Botany; Plants. 444 BOTANY OF THE LIVING PLANT 341,343-) The apparently fresh formation of mushrooms from day to day in the fields is thus accounted for. The button-mushrooms are hidden in the grass till the extension takes place. t sh , h. Fig. 344. Structure of the hymeniumof the Mushroom Psalliota (Agaricus) campestris. A is a vertical section through the pileus traversing several gills (/). B shows the structure of one gill more highly magnified : hy = the hymenium. C shows a small area of the hymenium in section ( x 350). The basidia project, each bearing two basidiospores, that number being exceptional but regularly present in the Mushroom. (After Sachs.) The Mushroom as commonly known is the fruiting-body, borne on the nutritive mycelium. It has the usual toad-stool form, with a stalk or stipe bearing the hemispherical pileus (Fig. 341). As in all large fungal bodies, it consists of false tissue. The hyphae composing it take first a parallel course so as to form the stipe, they then diverge upwards so as to form the wide-spread pileus. In the button stage the margin of the pileus is connected with the stipe by a thin covering of the velum ; but this is ruptured as the mushroom expands, leaving a ring round the stipe (Fig. 341). The radiating gills, which hang verti-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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