To estimate the extent of atmospheric pollution, a vegetation map of epiphytic bryophytes in the urban area of Tokyo was prepared after a lapse of 20 years since Taoda (1972). The correlation between atmospheric pollution and the distribution of epiphytic bryophytes was clear and the increase of mosses such as Pylaisiadelphus tenuirostris and Glyphomitrium humillimum was remarkable. This increase in distribution results from a lowering of sulpur dioxide through the control of gasses from industrial areas.

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