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Learn about the comparison of Female Gametophytes of Cycas and Female Gametophyte of Pinus.
Comparison # Female Gametophyte of Cycas:
1. Cycas is formed by the free-nuclear divisions of megaspore. Wall formation starts after the formation of about 1000 nuclei.
2. A very long resting period is not required in cycas between the free-nuclear stage and start of wall formation.
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3. Two to eight archegonia are formed in the female gametophyte of cycas.
4. In cycas egg is largest among all living plants.
5. Para-nuclei or Hofmeisterian bodies do not form in the central cell of archegonium of cycas.
Comparison # Female Gametophyte of Pinus:
1. Same as in Cycas, but wall formation starts after the formation of 2000 or more nuclei (e.g. over 2500 nuclei in Pinus roxburghii).
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2. A long resting period of 8-9 months is required in pinus between the free-nuclear stage and start of wall formation.
3. The number of archegonia in pinus varies between 1-5.
4. The egg is not that much large in pinus.
5. Para-nuclei or Hofmeisterian bodies are formed in the central cell of archegonium of pinus.
