. Foundations of Botany. Botany. Fig. 198. — A Lichen (Xanthoria). (Natural size.) Fig. 199. — A Lichen (Usnea). (Natural size.) called spermatid. Their office in Physcia is obscure, but in a few lichens they are thought to unite with a trichogyue cell, as in the red Xote the minute, powdery masses (soredia) on the surface of the thallus. Macerate if necessary under the cover-glass and examine under a high power. Compare with the structure of the thallus as seen in cross-section. (See next paragraph.) These soredia easily become detached and develop into new plants. Prepare for section
. Foundations of Botany. Botany. Fig. 198. — A Lichen (Xanthoria). (Natural size.) Fig. 199. — A Lichen (Usnea). (Natural size.) called spermatid. Their office in Physcia is obscure, but in a few lichens they are thought to unite with a trichogyue cell, as in the red Xote the minute, powdery masses (soredia) on the surface of the thallus. Macerate if necessary under the cover-glass and examine under a high power. Compare with the structure of the thallus as seen in cross-section. (See next paragraph.) These soredia easily become detached and develop into new plants. Prepare for sectioning by imbedding a small portion of the thallus with an apothecium in a piece of pith or by any suitable device for sectioning, and cut thin sections of thallus and fruit. 1 This, however, is doubtful. See Strasburger, Noll, Schenk, and Schimper's Text-Book of Botany, p. 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 Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn & company
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