In this article we will discuss about:- 1. Occurrence and Distribution of Equisetum 2. Sporophyte of Equisetum 3. Gametophyte 4. Phylogeny. Occurrence and Distribution of Equisetum: Equisetum is popularly known as horsetail because of its bushy habit. There are about 25 species distributed in all parts of the world except perhaps in Australia and New Zealand. They are found mostly [...]
In this article we will discuss about the external features and internal structure of calamites. External Features of Calamites: The calamitean fossils range from pith casts, stems, twigs and leaves to strobili. The stem is known as Calamities, leafy twigs are called An nularia, and fructification is known as Calamostachys. The plant body of Calamites was a tall tree (Fig. [...]
In this article we will discuss about:- 1. Habit of Lepidodendron 2. Internal Structure of Lepidodendron 3. Reproduction. Habit of Lepidodendron: Like other ancient lycopods, Lepidodendron was also tree like in habit (Fig.55). In general appearance it was not unlike that of present day Lycopodium. But in size the genus enormously exceeded the herbaceous Lycopodium. The petrified trunks were sometimes [...]