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Abstract
The marked differences between Plagiochila spinulosa (Dicks.) Dum. and P. killarniensis Pears. pointed out by Paton (1977) are confirmed and added to by further ones. As a result the two species are placed in different sections Spinulosae and Zonatae, respectively. For each of the two species the full synonymy including new synonyms and new lectotypifications and a comprehensive list of studied specimens and a distribution map are presented. In appendix, P. porelloides (Torrey ex Nees) Lindenb. is recorded from Madeira, a species new to Macaronesia.
