Abstract
AbstractThe new genus and speciesIsalonactis madagascariensisis characterized by a crustose, non-corticate, often sorediate thallus containing psoromic acid, tiny white pruinose ascomata with a thalline margin, an inconspicuous excipulum, a pale brown hypothecium, 3-septate hyaline ascospores and curved filiform conidia. Phylogenetic analyses using nuLSU andRPB2sequences placeIsalonactisin theRoccellaceae, close to the generaLecanactisandChiodecton. The new species was collected on sheltered siliceous rocks in the dry landscape of the Isalo Massif (S Madagascar).Dermatiscum thunbergiiis newly recorded from Madagascar.
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