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16 August 2017 Lambiella arenosa, a new species from the coastal Oregon dunes
Bruce McCune, H. Thorsten Lumbsch
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The Lambiella caeca group of North America is a poorly known group of diminutive epiphytes with black lecideine apothecia occurring on conifer bark. We describe a new species in this group, L. arenosa, which occurs on Pinus contorta on the dunes of the Oregon coast. Both Lambiella caeca and L. arenosa share a black disk with raised, thin, persistent, often flexuose, black margins, an internally dark exciple that is thin and even, a thin, usually dark brown epithecium, and branched paraphyses that are moniliform in the upper part with K. The easiest characters to differentiate them are the smaller spores (averaging 8–11 μm long) and more conspicuous thallus of L. caeca, in contrast to somewhat larger spores (averaging over 11 μm long) and endosubstratal thallus in L. arenosa. While the known ranges of L. arenosa and L. caeca s.str. do not overlap (hyperoceanic West Coast for L. arenosa, boreal for L. caeca s.str.), a third group of specimens is problematic. Currently, we lack the data to establish whether previously sequenced members of the L. caeca group from western North America belong to L. caeca, L. arenosa, or additional undescribed species.

Copyright ©2017 by The American Bryological and Lichenological Society, Inc.
Bruce McCune and H. Thorsten Lumbsch "Lambiella arenosa, a new species from the coastal Oregon dunes," The Bryologist 120(3), 329-334, (16 August 2017).
Received: 3 May 2017; Accepted: 1 July 2017; Published: 16 August 2017

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