Plant Systematics and Evolution

, Volume 196, Issue 3–4, pp 161–172 | Cite as

The tapetum inSchizaea pectinata (Schizaeaceae) and a comparison with the tapetum inPsilotum nudum (Psilotaceae)

  • Barbara M. Parkinson


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.

Key words

Schizaeaceae Schizaea pectinata Psilotaceae Psilotum nudum Combination tapetum parietal tapetum plasmodial tapetum 


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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • Barbara M. Parkinson
    • 1
  1. 1.Department of BotanyUniversity of the WitwatersrandJohannesburgSouth Africa

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