In this article we will discuss about the habit, habitat and structure of lepidodendron. Habit and Habitat of Lepidodendron: A new groups of arborescent lycopods, popularly known as Lepidodendrales, had evolved from the Middle Devonian lycopods. These arborescent plants would grow to 164 ft (50 m) and form extensive coal measures swamp forest of the Northern Hemisphere Euramerican province during [...]
In this article we will discuss about:- 1. Salient Features of Psilotum 2. Reproduction in Psilotum 3. Phylogeny. Salient Features of Psilotum: i. The sporophytes are dichotomously branched with an underground rhizome and upright branches. ii. The upright branches are leafless. iii. Rhizoids present instead of roots. iv. Stem have a relatively simple vascular cylinder. v. The sporangia are borne [...]
In this article we will discuss about the structure of Pogonatum with the help of diagrams. External Features of Pogonatum: The gametophyte is perrenial, differentiates into a rhizomatous basal portion and aerial upright shoots (Fig. 6.54A). The basal portion bears numerous rhizoids. The rhizoids are multicellular, elongated, thick-walled with oblique septa and are twisted together in a rope-like manner to [...]