Abstract
Mosses are remarkably successful colonizer on the variety of habitats. They can survive in extreme environmental conditions where only a few other plants grow. The main attributes of mosses are compact growth form, ability to retain moisture, ectohydric nature, poikilohydry and low growing habit. The occurrence of a particular species may reflect the microclimate of the locality. The present study reveals 75 species of acrocarpous mosses belonging to 23 genera and nine families from Imphal district which is an urban site of tropical climate. The most frequently occurring family is observed to be Pottiaceae with 28 species and 11 genera. The genus Bryum with 13 species is found to have highest number of species followed by Fissidens and Physcomitrium. Splachnobryum sp. and Bryum argenteum are found to be distributed on the nitrophilous substrata. It seems that changing climatic conditions and pollution are restricting the sexual reproduction and subsequently the genetic variability and adaptability in the moss taxa.
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