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Cycadales

  • Chhaya Biswas
  • B. M. Johri

Abstract

The plants have woody, columnar, unbranched stems with a crown of large, pinnately compound leaves, which make it look like a palm tree. Mucilage canals are present in the pith and cortex, and the wood is of manoxylic type. The leaf trace is diploxylic. The plants are dioecious, the male and female cones are mostly terminal. The megasporophyll has two to eight large orthotropous ovules. The microsporophylls have microsporangia on the abaxial surface. The motile male gamete (spermatozoid) has a spiral band of flagella.

Keywords

Pollen Tube Female Gametophyte Male Gametophyte Leaf Trace Neck Cell 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Chhaya Biswas
    • 1
  • B. M. Johri
    • 2
  1. 1.Gargi CollegeUniversity of Delhi South CampusNew DelhiIndia
  2. 2.Central Reference LibraryUniversity of DelhiDelhiIndia

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