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3 June 2014 An unusual ascospore shape and a new species, Umbilicaria nodulospora (Umbilicariaceae), from California and Oregon
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Abstract

We describe Umbilicaria nodulospora, a distinctive new species occurring on steep rock faces on old lava flows in California and Oregon. The species is unusual among lichenized ascomycetes in consistently having one or two shallowly bulging knobs at one end of each ascospore, suggesting a T, Y, or L shape; otherwise they are consistent with the appearance of ascospores in most Umbilicaria species. The species is readily distinguished in the field by a grayish tone to the brown upper surface, in combination with a thickly rhizinate lower surface. Distinctiveness of the species was supported by analysis of the ITS and LSU regions of nrDNA. No close relative or sister taxon was found. Umbilicaria nodulospora is so far known only from geologically recent flood basalts in central Oregon to northeastern California.

The American Bryological and Lichenological Society, Inc.
Bruce McCune, Joseph Di Meglio, and Marc J. Curtis "An unusual ascospore shape and a new species, Umbilicaria nodulospora (Umbilicariaceae), from California and Oregon," The Bryologist 117(2), 170-178, (3 June 2014). https://doi.org/10.1639/0007-2745-117.2.170
Received: 10 February 2014; Accepted: 1 April 2014; Published: 3 June 2014
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