The following points highlight the seven main steps involved in reproduction process of Cycas. The steps are: 1. Male Gametophyte Development 2. Pollination 3. Male Gametophyte Development 4. Mature Sperm 5. Female Gametophyte Development 6. Development of Archegonium 7. Fertilisation. Reproduction Process of Cycas: Step # 1. Male Gametophyte Development (Before Pollination): Microspore is the first cell of the male [...]
Sporne (1965) discussed Palaeocycas as the only fossil genus belonging to Cycadaceae. Florin (1933) described the female sporangiophores of this genus belonging to Palaeocycas integer and its leaves belonging to Bjuvia simplex. The female sporangiophores of Palaeocycas integer were described from Upper Triassic rocks of Sweden. These sporangiophores are believed to have borne seeds. Its leaves resembled that of present [...]
In this article we will discuss about Pentoxylales. After reading this article you will learn about: 1. Systematic Position of Pentoxylales 2. Discovery of Pentoxylales 3. Distinguishing Features 4. Stem Genera 5. Leaves 6. Seed-Bearing Organ 7. Affinities 8. Conclusion. Contents: Systematic Position of Pentoxylales Discovery of Pentoxylales Distinguishing Features of Pentoxylales Stem Genera of Pentoxylales Leaves of Pentoxylales Seed-Bearing [...]