Rickettsias are mainly known for their disease-causing capability. These micro-organisms can cause a great variety of diseases in different flora and fauna; especially in human. Rickettsiosis is a disease caused by intracellular bacteria. It’s a type of infectious disease. Rickettsiosis can be divided mainly in two groups: Spotted fever group …

Systematic Position Division: Lycophyta / Lepidophyta Class: Eligulopsida Order: Lycopodiales Family: Lycopodiaceae Genus: Lycopodium Also known as club mosses, Lycopods, creeping pines or tailing pines. Ligule: A membranous outgrowth projecting from the leaf sheath. On the basis of ligule, Lycophyta has 2 classes: Eligulopsida: Lycopodium phylloglossum Liqulopsida – Isoetales, Selaginellales …

Psilotum is commonly known as Whisk-fern. Salient features of Pilotum The sporophytes are dichotomously branched with an underground rhizome and upright branches. The upright branches are leafless. Rhizoids are present instead of root. Stem has a relatively simple vascular cylinder. The sporangia are born in groups (trilocular) and form synangia. …