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Abstract
The Neovolcanic Belt is a physical and ecologic barrier that has affected plant distribution patterns in central Mexico. It has been proposed that the barrier effect is incomplete due to openings that connect valleys across the Belt and permit floristic interchange. To substantiate the presence of floristic corridors, moss collections were made in the Chalco and Toluca areas and in the valleys of the state of Morelos. About 3594 samples representing 330 species and varieties from 2700 m or below were studied. The tropical species were selected and used as markers to determine possible floristic interchanges. Although the number of species shared between valleys on either side of the Belt indicates that its topographic discontinuities may have permitted it, the time of the interchange of tropical taxa cannot be established. The alpine species may have reached the corridors in the Pleistocene along with species from other elevations.