In this article we will discuss about:- 1. History of Psilophytopsida 2. Classification of Psilophytopsida 3. Phylogeny. History of Psilophytopsida: One of the most perplexing and enigmatic problems of evolutionary morpholÂogy which is still eluding a solution is that of the origin of land plants. The invasion of the land masses by the aquatic inhabitants which perhaps took place about [...]
In this article we will discuss about:- 1. Distribution of Psilotum 2. Sporophyte of Psilotum 3. Gametophyte 4. Phylogeny. Distribution of Psilotum: Though several species have been reported in Psilotum, all of them usually fall into two well defined species, viz., P. nudum (P. triquertum) and P.flaccidum (P. complanatum). The earlier reports of the existence of several species is probably [...]
In this article we will discuss about:- 1. Occurrence and Distribution of Ophioglossum 2. Sporophyte of Ophioglossum 3. Gametophyte 4. Phylogeny. Occurrence and Distribution of Ophioglossum: Of all the genera of the family, Ophioglossum is the most widely distributed being found in almost all the parts of the globe. The genus is divided into three sub-genera viz.: (i) Euophioglossum e.g., [...]