. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 265 production is characteristic of nearly all of the Agaricales and it is not surprising that a bit of dead wood or piece of lumber can not be exposed without being infested with the spores. E. Boletaceae or Fleshy Pore Fungi.—The members of this family are generally characterized by a stalk and a pileus which. Fig. 173. Pore forms of the Agaricales: A, Boletus, showing fleshy pore- bearing layer, p. B, top view of a woody, bracket form, Elfvingia. The concentric lines represent the annual growth. C, section of a similar form,
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 265 production is characteristic of nearly all of the Agaricales and it is not surprising that a bit of dead wood or piece of lumber can not be exposed without being infested with the spores. E. Boletaceae or Fleshy Pore Fungi.—The members of this family are generally characterized by a stalk and a pileus which. Fig. 173. Pore forms of the Agaricales: A, Boletus, showing fleshy pore- bearing layer, p. B, top view of a woody, bracket form, Elfvingia. The concentric lines represent the annual growth. C, section of a similar form, showing three layers of pores that represent three years' growth. D, en- larged view of under surface, showing one of the pores with hymenial layer. bears pores, the latter being easily separable as a layer from the pileus (Fig. 173, ^). F. Agaricaceae or Gill Fungi.—These fungi more commonly assume an umbrella form, although some of them are of the shelving bracket type (Fig. 170). The hymenium is arranged on the surface of gills or plates. Many of them are highly prized for the table, though they contain comparatively little nourishment, and must be regarded as relishes rather than foods. While the majority of the 5,000 species of the family are edible, some of them contain the most deadly poisons. No rule can be given that will enable the collector to separate these fungi into the two mythical groups of poisonous toadstools and edible mushrooms. Each species must be known individually before it is safe to use them for food. All forms with a volva should be most carefully identified, because this is a feature of the deadly amanitas (Fig. 170), which are among the most poisonous plants 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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