Cycadofilicales / Pteridospermales Ø Pteridospermales are a group of Fossil Gymnosperms. Ø They are also called as Cycadofilicales (Chamberlain used the term). Ø As the name suggests, they are the ‘Seed Ferns’. Ø They are Gymnosperms with ‘Fern-like’ leaves which produce ‘Seeds’. The Reconstruction of a Pteridospermales Member. Note the Erect Stem, Fern Like Leaves, … Read more
Pteridophytes vs Gymnosperms Pteridophytes Pteridophytes are a group of primitive land plants belongs to Cryptogams. They are the first plant group with vascular tissue for the conduction of water and food materials and hence they are called as Vascular Cryptogams. Gymnosperms Gymnosperms are a group of primitive seed-producing plants of Spermatophytes (Phanerogams). They are ‘Naked-Seed’ … Read more
Classification of Gymnosperms by Chamberlain: Classification of Gymnosperms, Outline of the history of Classification of Gymnosperms, Chamberlain System of Classification of Gymnosperms, Class Cycadophyt and Coniferophyt, Order Cycadofilicales (Pteridospermales) Cycdeoidales (Bennettitles) and Cycdales, Order Cordaitales, Ginkgoales, Coniferales and Gnetales. Learn more: Note on Classification of Gymnosperms The preview of the PPT on Classification of Gymnosperms … Read more
There are many systems for the classification of Gymnosperms in the literature. Robert Brown (1827) for the first time recognized Gymnosperms as a separate group of plants. Bentham and Hooker (1883) placed Gymnosperms between Dicots and Monocots in their classification (General Plantarum). The present acticle discusses the Gymnosperm Classification Proposed by by Chamberlain in 1912 … Read more
Flower vs Vegetative Branch The flower is the reproductive structure formed in the plant group Angiosperms or Magnoliophyta, commonly called as the ‘Flowering Plants’. The flower is a ‘modified branch’ or axis developed from a ‘determinate’ apical meristem. The term ‘determinate’ indicates the absence of further growth of the apical meristem after the production of … Read more