. Comparative morphology of Fungi. Fungi. Fig. 309.—Nidularia pisiformis. Development of basidia. (X 1,200; after R. E. Fries, 1911.) Hydnangiaceae.—In this family we return to the stage of Leucogaster of the Rhizopogonaceae. Here the echinulate spores are no longer imbedded in a gel and the hymenium is always compact. The first member of this series is Hydnangium in which we find the beginnings of several divergent lines within the family. The ontogeny of this large genus has been little studied. The majority of species have a simple peridium, not greatly differentiated from the texture of th
. Comparative morphology of Fungi. Fungi. Fig. 309.—Nidularia pisiformis. Development of basidia. (X 1,200; after R. E. Fries, 1911.) Hydnangiaceae.—In this family we return to the stage of Leucogaster of the Rhizopogonaceae. Here the echinulate spores are no longer imbedded in a gel and the hymenium is always compact. The first member of this series is Hydnangium in which we find the beginnings of several divergent lines within the family. The ontogeny of this large genus has been little studied. The majority of species have a simple peridium, not greatly differentiated from the texture of the trama. Apparently as a degeneration phenomenon, we have a series of light-spored species with progressively thinner peridia, until finally the peridium is absent in some Californian species, as Gymnomyces Gardneri and G. Stillingeri. In the opposite direction we get a gradual thickening of the peridium and darkening of the spores, reaching a climax in Hydnan- gium Fitzpatrickii, with nearly black spores and a thick peridium of pseudoparenchyma. A still higher group of species has the peridium differentiated into two layers and nearly black spores, typified by H. citrinum. Such data as are available, lead one to believe that the cavities form in a hemispher- ical dome just under the peridium and develop basipetally until the whole glebal tissue is filled with cavities. The immature condition of a number. 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 Gäumann, Ernst Albert, 1893-1963; Dodge, Carroll William, 1895-. New York [etc. ] McGraw-Hill Book Company, Inc.
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