Map Lichen?? on rock - Mason Lake
Rhizocarpon geographicum a form of crust lichen crustose
See an interesting article on the use of lichens to measure the date of deposition.
yellow-green islands are areolae
black fungal hypothallus at the margin.
Note that there are other lichens on this rock, a whole little ecosystem
Mason Lake, King County, Washington, USA
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Uploaded on October 8, 2008
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