In this article we will discuss about the structure and reproduction in Ophioglossum. Structure of Ophioglossum: Sporophyte: The sporophyte is differentiated into a subterranean rhizome with roots and spirally arranged leaves bearing sporangiferous spike (Fig. 7.92A). Stem: The stem is represented by a short, erect, subterranean rhizome. But in epiphytic species, it is horizontal and dorsiventral structure. The upper surface [...]
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:- 1. Habit and Habitat of Selaginella 2. Salient Features of Selaginella 3. Structure 4. Reproduction. Habit and Habitat of Selaginella: Selaginella shows considerable variation in size, symmetry and morphology. Mostly they are herbaceous perennials, however, a few are annuals (Selaginella pygmaea). Majority are dorsiventral, prostrate and creeping (Fig. 7.45) on the surface (e.g., [...]