In this paper, the results of the field-researches made between 2004-2005 in different places of Bistrita Mountains are presented. The lichen flora analysis had carried out to 115 taxa identification, belonging to Ascomycotina Class. The species have been analysed from the ecological point of view, on the values of ecological indexes (light, humidity, temperature and chemical reaction of the substrata) published by Ellemberg et al (1992). 93,05% of the total number of species are common species and 6,95% are rare species (Cladonia amaurocraea, C. rangiformis, C. sulphurina, Cetraria sepincola, Pheophyscia ciliata, Peltigera pretextata). One species – Collema subflaccidum is for the second time cited in romanian lichenological flora.