Lichens are well known for their peculiar, crystalline aromatic constituents that accumulate on the

thallus. Lichen compounds are also known to show some biological activities against microorganisms.

The present paper describes the extraction and antibacterial activity of various solvent extracts of

lichen Ramalina hossei Vain. (Ramalinaceae), against Gram positive and Gram negative bacteria.

The dried and powdered lichen material was extracted with solvents namely methanol, chloroform and

petroleum ether and the solvent extracts were subjected to antibacterial activity using Kirby Bauer

method. Chemical tests revealed the presence of Usnic acid and sekikaic acid aggregates. The

extracts were found to possess more activity against Gram positive bacteria than Gram negative

bacteria. Among solvent extracts, methanol extract showed more inhibition of test bacteria than

others. From the results, it could be concluded that the lichen selected for the study possess active

antimicrobial principles. The results are in justification with the folkloric uses of lichen extracts.

Author (s) Details

  1. S. Vinayaka

Plant Biology Lab., Department of Botany, Sri Venkataramana Swamy College, Vidyagiri, Bantwal-574211, Dakshina Kannada, Karnataka, India.

  1. R. Prashith Kekuda

Department of Microbiology, S.R.N.M.N College of Applied Sciences, NES Campus, Balraj Urs Road, Shivamogga-577201, Karnataka, India.

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