Micromorphological and Biochemical Studies of Laurencia obtusa (Hudson) Lamouroux (Ceramiales) of Rhodophyceae Nandhagopal Karmegam 1, * and Poonam Sethi 2 1, *PG Department of Plant Biology and Plant Biotechnology, Loganatha Narayanaswamy Government College (Autonomous), Ponneri - 601 204. Thiruvallur District, Tamil Nadu. 2 PG Department of Plant Biology and Plant Biotechnology, Guru Nanak College (Autonomous), Chennai, Tamilnadu, India. Corresponding author : Dr. Nandhagopal Karmegam PG Department of Plant Biology and Plant Biotechnology, Loganatha Narayanaswamy Government College (Autonomous), Ponneri - 601 204. Thiruvallur District, Tamil Nadu. Email: nandhuimayam@gmail.com Abstract Thallus of Laurencia obtusa of Rhodophyceae was studied and detailed micromorphological evaluation was done. Morphology of the thallus has been studied to aid pharmacognostic and phytochemical evidences to aid in taxonomic species identification. Parameters presented in this paper may be proposed to establish the authenticity of this red alga and can possibly help to differentiate this alga from its other species. Since the collections were made in the month of March, Laurencia was with few gametophytic thalli . The study revealed several interesting anatomical characters and its cellular details. Phytochemical screening reveal the presence of tannin, saponin and flavonoids. These features both anatomy and phytochemistry clearly help in identification of this plant. Key words: algae, Laurencia, marine, micromorphological, phytochemical, rhodophyceae. 1. Introduction India is a country with diverse medicinal plants which form the backbone of traditional systems of medicine in India, thousands of tribal communities still use folklore medicinal plants for the cure of various diseases. The great interest in the use and importance Journal of Information and Computational Science Volume 10 Issue 1 - 2020 ISSN: 1548-7741 www.joics.org 1078