Observation 12745: Peltigera membranacea (Ach.) Nyl.
When: 2008-10-16
No herbarium specimen

Notes: Surface of this lichen reminds me most of brown algae scum bubbling on top of a warm pond. But wait, there’s more! Surface color varies from green near tips of wider lobes to brown on older surfaces. The smallest lobes are up-curved, and on the tips there are thicker yellow protuberances. Yellow cracks in surface as well. Reverse with multiple rhizimes, to nearly an inch in length, mostly white to hyaline, but darker brown or nearly black at older surfaces. Growing on the edge of a sand dune.

Proposed Names

5% (2)
Eye3
Recognized by sight
56% (1)
Used references: Flipped through Brodo: shiny, epruinose surface; abundant apothecia and no lobules; coastal Oregon: leaves only one or two species, of which this is most common.
70% (1)
Eyes3
Recognized by sight: The ground-dwelling habit, the color, and the ecorticate, rhizinate lower surface all make this Peltigera. The blistered pattern of the upper surface, the lobe tips that fold over between the apothecia, and the lower surface with veins running right up to the edge indicate that this is probably P. membranacea.
Used references: ‘Lichens of North America’ has a pretty good overview of NA Peltigera species (there are more being defined all the time, and there is certainly much more taxonomic work to be done to sort out this genus). Take a look at the Peltigera section of the North American Lichen Checklist to find some of the sources that describe the taxa not treated by Brodo et al. (2001): http://www.ndsu.edu/instruct/esslinge/chcklst/chcklst7.htm

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-10-17 12:36:03 CDT (-0400)
Last modified: 2008-10-17 12:36:03 CDT (-0400)
Viewed: 56 times, last viewed: 2016-10-28 18:19:28 CDT (-0400)