. Pilze; ihrer Natur, Einfluss, und verwendet;. Pilze. STEUCTUEE, 33 aussehen kann, indem ich unterstelle, die Existenz eines genauen Höhe in der Wand der Zelle zurückzuführen sein, nach einer Spirale in Richtung von einem Ende des Gewindes auf der anderen. Diese Vermutung würde, denkt er, Accord gut mit dem optischen Erscheinungen, und es wäre genau der Kontur, auf die er anspielt. Er erklärt, dass er in seinem Besitz ein Gewinde von Trichia chrysosperma, in dem die Spirale Aussehen so offensichtlich durch eine Erhöhung von dieser Natur, in der es so klar ist, dass kein int verursacht wurde

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. Fungi; their nature, influence, and uses;. Fungi. STEUCTUEE, 33 appearance may be accounted for by supposing the existence of an accurate elevation in the wall of the cell, following a spiral direction from one end of the thread to the other. This supposition would, he thinks, accord well with the optical appearances, and it would account exactly for the undulations of outline to which he alludes. He states that he had in his possession a thread of Trichia chrysosperma, in which the spiral appearance was so manifestly caused by an elevation of this nature, in which it is so clear that no internal spiral fibre exists, that he did not think there could be a doubt in the mind of any person carefully examining it with a power of 500 diameters that the cause of the spiral appearance was not a spiral fibre. In Arcyria, threads of a different kind are present;. Fig. 11.—Arcyria iiwa-nmta, with portion of tlireada and spore, magnified. they mostly branch and anastomose, and are externally furnished with prominent warts or spines, which Mr. Currey * holds are also arranged in a spiral manner around the threads. In other Myxogastres, threads are also present without any appreciable spiral markings or spines. In the mature condition of these fungi, they so clearly resemble, and have such close affinities with, the Trichogastres that one is led almost to doubt whether it was not on hasty grounds, without due examination or consideration, that proposals were made to remove them from the society of their kindred. Very little is known of the development of the spores in this group; in the early stages the whole substance is so pulpy, and in the latter so dusty, whilst the transition from oue to * Carrey, "On Spiral Threads of Trichia, " in "Quart. Journ. Micr Science " (1855), iii. p. 17. ' 3. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustr

Stockbilder mithilfe von Tags suchen

• bookcentury1800
• bookdecade1880
• bookyear1888
• buchautorcookemcm