Fine structure of ascospore formation in Poronia punctata
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Abstract
Ascospore ontogeny in Poronia punctata is described. At the time of complete delimitation the ascospore is enclosed within two membranes, the spore plasma membrane to the inside and the investing membrane to the outside. The initial ascospore wall is the primary wall, formed by deposition of electron-transparent material between these two membranes. Differentiation within the region occupied by the primary wall begins with the development of an electron-dense epispore adjacent to the highly convoluted spore plasma membrane. Immediately after the epispore is differentiated the mesospore begins to form between the epispore and the spore plasma membrane. The mesospore becomes about twice as thick as the epispore. With the formation of the mesospore, differentiation and development within the region formerly occupied by the electron-transparent primary wall is complete. The outer portion of the primary wall, that between the epispore and the investing membrane, is the penspore. After formation of mesospore, epispore, and perispore, electron-transparent material is deposited centripetally between the spore plasma membrane and the mesospore. This innermost wall is the endospore.
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