Abstract
The marked differences between P. spinulosa (Dicks.) Dum. and P. killarniensis Pears. pointed out by Paton (1977) are confirmed and supplemented. As a result, the 2 spp. are placed in different sections, Spinulosae and Zonatae, respectively. For each of the 2 spp., the full synonymy including new synonyms and new lectotypifications as well as a comprehensive list of studied specimens and a distribution map are presented. P. porelloides (Torrey ex Nees) Lindenb. is recorded from Madeira, a new record for Macaronesia.

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