Observation 132904: Arthonia phaeobaea (Norman) Norman

On Si rock (upper Jurassic-Lower Cretaceous turbidite of Lummi Formation) in salt-spray zone (note Hydropunctaria maura in photos).

CNALH (http://lichenportal.org/portal/taxa/index.php?taxon=52465) specimens listed of Bruce Ryan from Fidalgo Island and Irwin Brodo from Queen Charlotte Islands and New Brunswick. North American photos on internet by Sharnoff from New Brunswick, Curtis Bjork from Bute Inlet BC and myself from Bashke Islands Alaska ( http://mushroomobserver.org/93439?q=1DvTA )

Seems like another lichen which is probably very common (like the Catillaria chalybeia observation I recently made on MO) from Washington to Alaska, but not much noticed.


image 5mm across
with Hydropunctaria maura and Caloplaca rosei
KOH spores ave 20 × 15u
specimen collected 1.5m above cobble beach on this turbidite of upper Jurassic-Lower Cretaceous Lummi Fm
view from near previous photo – Fred Rhoades looking south along west side of Lummi

Proposed Names

83% (1)
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Used references: B.J. Coppins & A. Aptroot in Smith, C.W., Aptroot, A., Coppins, B.J., Fletcher, A., Gilbert, O.L., James, P.W. and Wolseley, P.A. (2009) The Lichens of Great Britain and Ireland;Noble, W. J. (1982) The Lichen Flora of the Coastal Douglas-fir Dry Subzone of British Columbia. Ph.D. Thesis, University of British Columbia, Reprinted and nomenclaturally updated in 1996 by Bruce McCune with per mission of the author; Brodo, Irwin M. and Sloan, Norm A. 2004. Lichen Zonation on Coastal Rocks in Gwaii Haanas National Park Reserve, Haida Gwaii (Queen Charlotte Islands), British Columbia. Canadian Field-Naturalist 118(3): 405-424.; Ryan, Bruce (1988) Marine and Maritime Lichens on Serpentine Rock on Fidalgo Island, Washington. The Bryologist 91(3) 186-190
Based on microscopic features: see photos
Based on chemical features: K-

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Great documentation
By: Jason Hollinger (jason)
2014-02-07 13:43:27 PST (-0800)

Never even heard of such a lichen. Arthonia is the last genus I would have guessed, but there it is, your micrographs are very clear. Fascinating! Thanks for posting this.

Created: 2013-05-03 12:06:31 PDT (-0700)
Last modified: 2013-05-03 12:15:36 PDT (-0700)
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