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Dryad

The first African record of Isothecium algarvicum in Kroumiria (Tunisia), a relictual element of the Neogene flora?

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Nov 28, 2022 version files 156.90 KB

Abstract

Isothecium algarvicum W. E. Nicholson & Dixon, was discovered in Tunisia, which constitutes the first report of this Macaronesianoceanic species in Africa. Three distinct populations were observed in ravines in the humid Meso-Mediterranean vegetation belt of Kroumiria. The Tunisian material is fully described, with particular attention to alar and supra-alar cells, prorate cells and other morphological characteristics. The density and size of the prorate cells appear to be a robust diagnostic characteristic for the separation of Isothecium algarvicum, I. alopecuroides and I. myosuroides. Detailed analysis of the forest habitat reveals a uniquely rich environment. The origin of a possibly relict species with Macaronesian-oceanic affinities is discussed.