In this article we will discuss about the classification of psilophytopsida. The Psilophytopsida comprise of the fossilised ancient Silurian-Devonian order Psilophytales. The discovery of the different genera from such wide places as Canada, Scotland, Europe and Australia shows that these plants were of world-wide distribution in those days. The Psilophytopsida and the living Psilotopsida have been included within a single [...]
In this article we will discuss about:- 1. Habit and Habitat of Pteridium 2. External Features of Pteridium 3. Internal Structure 4. Reproduction. Habit and Habitat of Pteridium: Pteridium a monotypic genus (represented by a single species P. aquilinum; Reimers, 1954), is one of the oldest known fern (fossil records over 55 million years old have been found). It is [...]
The Pteridophyta, commonly called vascular cryptogams, are represented by more than about 10,000 species, and are characterized by the following peculiarities: 1. Members of this group are most primitive living vascular plants such as Selaginella, Lycopodium, Equisetum etc., and also fossil vascular plants such as Rhynia, Horneophyton, Asteroxylon, etc. 2. Most of the plants prefer to grow in cool and [...]