Lichens
Lichens Contents: 1. INTRODUCTION 2. GENERAL ACCOUNTS 3. INTERNAL STRUCTURE OF THALLUS 4. LIFE CYCLE 5. FERTILIZATION 6. ROLE OF LICHENS AS INDICATOR 7. REFERENCES 1. Introduction: The lichens are an association consisting of a phycobiont (al algae) and a mycobiont (a fungus) growing together to form a plant body of recognizable structure and appearance. There are 18,000 to 20,000 species of lichens that are known. 2.General account of lichens 2.1 Occurrence Lichens are present everywhere we can say that they are ubiquitous. They are present between all regions of the Arctic and Antarctic. Lichens are found on exposed areas like bark of trees and on wood , directly on the ground and shores of sea. Lichens are also present on the rocks that are present in the fresh water. These are also present in the polar regions of frozen substrata. 2.2 Components of lichens Lichens have two components. It consist of fungi(mycobionts) and algae(photobionts) 2.3 Morphology of lichen...