Rhizoplaca ouimetensis is described new to science, growing on outcrops of diabase sills in the Lake Superior region of Ontario, Canada. It is the first known sorediate species of the genus, and a phylogenetic reconstruction based on the ITS and mtSSU markers place it in the R. chrysoleuca group. Morphologically, however, it resembles sorediate, yellow-green species of Lecanora with usnic acid, e.g., L. handelii and L. soralifera, but differs from those in forming larger, often pulvinate or minutely peltate areoles with a well-developed upper cortex and a medulla densely filled with calcium oxalate crystals.
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27 December 2022
Rhizoplaca ouimetensis sp. nov. (Lecanoraceae) from Ontario, the first sorediate species in the genus
Sam Brinker,
Ann M. Evankow,
Einar Timdal
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The Bryologist
Vol. 125 • No. 4
Winter 2022
Vol. 125 • No. 4
Winter 2022
Lecanorales
lichenized Ascomycota
new species
North America
taxonomy