The tapetum inSchizaea pectinata (Schizaeaceae) and a comparison with the tapetum inPsilotum nudum (Psilotaceae) |
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Authors: | Barbara M Parkinson |
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Institution: | (1) Department of Botany, University of the Witwatersrand, Private Bag 3, WITS. 2050 Johannesburg, South Africa |
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Abstract: | A combination tapetum consisting of a cellular, parietal component and a plasmodial component occurs inSchizaea pectinata. A single, tapetal initial layer divides to form an outer parietal layer which maintains its cellular integrity until late in spore wall development. The inner tapetal layer differentiates into a plasmodium which disappears after the outer exospore has developed. In the final stages of spore wall development, granular material occurs in large masses and is dispersed as small granules throughout the sporangial loculus. No tapetal membrane develops. Comparisons are drawn with the combination tapetum found inPsilotum nudum. |
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Keywords: | Schizaeaceae Schizaea pectinata Psilotaceae Psilotum nudum Combination tapetum parietal tapetum plasmodial tapetum |
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