Abstract

AbstractThe new genusSinuicella, an early successional lichen, was found on bare soil in Oregon, USA. The thallus is minute fruticose, grey to nearly black, branching isotomic dichotomous, branches round, 20–90 μm wide in water mount. The cortex is composed of interlocking cells shaped like jigsaw puzzle pieces. Spores are hyaline, 1-septate, 25–40(–50) × 6.5–9(–11) μm. Maximum likelihood phylogenetic analyses on multilocus data sets, first spanning the entire orderPeltigeralesand then restricted toPeltigeraceaewith extended sampling fromSolorinaandPeltigera, revealed the placement ofSinuicellaoutside of currently recognized genera, sister toPeltigera, with high support. Based on the phylogenetic, morphological and ecological distinctness ofSinuicella, we formally introduce a new genus represented by the single speciesS. denisonii. The cyanobiont ofS. denisoniiisNostocfrom phylogroup XL, Clade 2, Subclade 3 based on therbcLXmarker.

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