. Botany of the living plant. Botany; Plants. 442 BOTANY OF THE LIVING PLANT of these Fungi. Thus in the Gasteromycetes the fructification is closed, the basidia being produced internally, and the spores set free by rup- ture, as in the Puff-Bails. In the Hymenomycetes the basidia are borne collectively in a definite layer called a hymenium, exposed to the air, from which the spores are shed, as in the Mushrooms, Toadstools, and Shelf- Fungi (Figs. 340, 341). The mycelium may obtain nourish- ment in various ways. It is some- times parasitic as in the Honey Agaric (Armillaria mellea), which pen
. Botany of the living plant. Botany; Plants. 442 BOTANY OF THE LIVING PLANT of these Fungi. Thus in the Gasteromycetes the fructification is closed, the basidia being produced internally, and the spores set free by rup- ture, as in the Puff-Bails. In the Hymenomycetes the basidia are borne collectively in a definite layer called a hymenium, exposed to the air, from which the spores are shed, as in the Mushrooms, Toadstools, and Shelf- Fungi (Figs. 340, 341). The mycelium may obtain nourish- ment in various ways. It is some- times parasitic as in the Honey Agaric (Armillaria mellea), which penetrates the trunks of forest trees, ravaging the cambium, and killing them (see Fig. 292). Many OI the bhelf-rungl [Foly- Qf the radiating, downward-directed gills x ,, ,1 To the right a young fructification or pOrUS) grOW paraSltlCally at the ex- -button" Mushroom. (Reduced.) (From pense of the heart-wood of trees, Strasbur§er) making them hollow. The infection comes through injury by wind, which exposes the internal tissues to the invading spores. The mycelium may live for years, digesting the lignined walls, till it is. Fig. 341. Psalliota (Agaricus) campestris. Mush- room. The hymenium covers the surface. 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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