In this article we will discuss about the similarities and differences between pteridophytes and gymnosperms. Similarities between Pteridophytes and Gymnosperms: 1. There is a regular heteromorphic alternation of generations. 2. Sporophyte is the predominant plant body and is differentiated into root, stem and leaves. 3. Some pteridophytes and some gymnosperms exhibit air cinate vernation in young leaves. 4. There are [...]
In this article we will discuss about:- 1. History of Sphenophylum 2. Anatomy of Sphenophylum 3. Reproduction 4. Phylogeny. History of Sphenophylum: Sphenophyllales represent a small and compact group of sphenopsida. They have left no surviving representatives. The geological history of Sphenophyllales dates back to a time earlier than carboniferous period. Some of the genera like Sphenophyllum appeared during Devonian [...]
After reading this article we will learn about:- 1. Occurrence and Distribution of Salvinia 2. Sporophyte of Salvinia 3. Gametophyte 4. Phylogeny. Occurrence and Distribution of Salvinia: The genus Salvinia has 12 species most of which are found to be distributed in the African continent. The genus is represented in India by two species namely S. natans and S. auriculata. [...]