In this article we will discuss about:- 1. Habit of Calamites 2. Sub-Genera of Calamites 3. Structure. Habit of Calamites: The name Catamites was first proposed by Suckow (1784) and later in 1828, Brongniart established its relationship with Equisetum. Catamites was a tall tree that attained a height of about 33 ft (10 m). The plant had a stout underground [...]
In this article we will discuss about the vegetative and sexual modes of reproduction in Anthoceros with the help of diagrams. Vegetative Reproduction in Anthoceros: Vegetative Propagation takes Place by the following Four Methods: (a) By Progressive Death and Decay of the Older Parts of the Thallus (Fragmentation): Vegetative reproduction often rakes place by the decay of the older [...]
In this article we will discuss about the classification of pteridophyta. 1. Class: Psilotopsida: The members of the class Psilotopsida show close resemblance in fundamental characteristics to the Silurian and Devonian members of Rhyniopsida (e.g., Rhynia, Cooksonia), Zostero- phyllopsida (e.g., Zosterophyllum) and Trimero- phytopsida (e.g., Trimerophyton, Psilophyton). Psilotopsida includes only two living genera viz., Psilotum and Tmesipteris. Characteristic Features of [...]