Seaward, MRD 1989: Progress in the study of the Yorkshire lichen flora. - Naturalist114: 31-33. [RLL List # 139 / Rec.# 16967] Keywords: BRITISH ISLES/ YORKSHIRE/ MAPPING
Abstract: 1 figure. [770 taxa reported over the past 300 years, 226 based on old records and most of these not observed in the last century. "Of the 544 extant taxa, approximately 160 have been discovered during the past 32 years."]
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