FREQUENCY, ABUNDANCE AND DISTRIBUTION OF LICHEN IN NATIONAL BOTANICAL GARDEN, MIRPUR, DHAKA, BANGLADESH

Abstract

An investigation was carried out to study lichen flora of National Botanical
Garden, Dhaka, during the tenure of May 2018 to April 2019. Seven genera of
lichens namely Chrysothrix, Cladonia, Cryptothecia, Herpothallon, Parmelia, Pertusaria
and Usnea were recorded from 15 blocks of the Garden. Lichens were abundantly
grown and their number increased from June to October, whereas from
November to April the number of lichens gradually decreased. The maximum
frequency percentage (36.52) of the association found in Parmelia while minimum
frequency percentage was recorded 2.48 in Usnea. Among three different heights,
the highest number of lichens was recorded within 2 to 4 feet. Most exclusively,
Parmelia was found in all the studied blocks, whereas other identified lichens
were observed randomly. The present investigation will be helpful to enrich the
knowledge on lichen biota of Bangladesh.