Identifier: elementarybotan00atki (find matches)
Title: Elementary botany
Year: 1905 (1900s)
Authors: Atkinson, George Francis, 1854-1918
Subjects: Botany
Publisher: New York : Holt
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Fig. 234.Portion of section of lamella of Agaricus campestris.tr, trama; sh, subhymenium; />, basidium; st, sttrigma(//. sterigmata); g; basidiospore. Fig. 235.Portion of liymenium of Co-prinus micaceus, showing largecystidium in the liymenium. two spinous processes at the free end. Each one is a slerig?na(plural slerigmala), and bears a gonidium. In a majority of themembers of the mushroom family each basidium bears fourspores. When mature these spores easily fall away, and a massof them gives a purplish-black color to objects on which they fall,so that a print of the under surface of the cap showing thearrangement of the gills can be obtained by cutting off the stem,and placing the pileus on white paper for a time. 422. How the mushroom is formed.—The mycelium of the 202 MORPHOLOGY.
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FUNGI: MUSHROOMS 203 mushroom lives in the ground, and grows here for several monthsor even years, and at the proper seasons develops the maturemushroom plant. The mycelium lives on decaying organic mat-ter, and a large number of the threads grow closely together form-ing strands, or cords, of mycelium, which are quite prominentif they are uncovered by removing the soil, as shown in fig. 236.423. From these strands the buttons arise by numerous threadsgrowing side by side in a vertical direction, each thread growingindependently at the end, but all lying very closely side by

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