Abstract
A systematic survey of lichens was performed in 2019 in four of the five territories constituting the French Scattered Islands (Europa Island, Juan de Nova, Glorioso Islands, and Tromelin) focusing on the genus Ramalina. Species were characterized using morphological (macroscopic and microscopic) features and an accurate chemical profiling method based on high-performance liquid chromatography coupled with diode-array detection and electrospray ionization tandem mass spectrometry (HPLC-DAD-MS). Five species were found in these territories. Two of them, Ramalina dumeticola and R. ovalis, are already known. Three species are introduced here as new to science: Ramalina gloriosensis sp. nov., R. hivertiana sp. nov., and R. marteaui sp. nov. An identification key is provided for the species found in the area and morphologically closely related taxa.
Highlights
The lichen genus Ramalina exhibits a cosmopolitan distribution and hosts an important taxonomic diversity
This paper aims at contributing to the knowledge of the genus Ramalina in the Mozambique Channel and Western Indian Ocean, in particular the Scattered Islands (French Southern and Antarctic Lands): Europa Island, Juan de Nova, Glorioso Islands, and Tromelin (Fig. 1) where extensive field surveys were performed in 2019
Europa Island, Juan de Nova, Glorioso Islands, and Tromelin constitute, along with Bassas da India, the fifth district of the French Southern and Antarctic Lands (TAAF)
Summary
The lichen genus Ramalina exhibits a cosmopolitan distribution and hosts an important taxonomic diversity. When considering islands of the Western Indian Ocean, available data concerning Ramalina become scarcer, though some territories have recently been targeted by field work or subjected to literature surveys: Seychelles (Seaward & Aptroot 2009; Neuwirth & Stocker-Wörgötter 2017), Mauritius (Diederich & Ertz 2020), and Madagascar (Aptroot 2016) Taken together, these last references list eleven accepted Ramalina species for the region, which is notably lower than the fifteen species recorded from the Galapagos only (Aptroot & Bungartz 2007), or the fifty-four species recorded from the Atlantic Islands (A ptroot & Schumm 2008). This paper aims at contributing to the knowledge of the genus Ramalina in the Mozambique Channel and Western Indian Ocean, in particular the Scattered Islands (French Southern and Antarctic Lands): Europa Island, Juan de Nova, Glorioso Islands, and Tromelin (Fig. 1) where extensive field surveys were performed in 2019
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