Observation 9638: Lecanora hagenii (Ach.) Ach.
When: 2008-08-18
Herbarium specimen reported

Notes: This is one of the most pollution tolerant lichens known. It is the only one that grows in quantity in urban Pasadena. I’ve had the ID verified by Curtis Bjork. Look for it at the base of certain species of trees (magnolia, date palm, camphor, shamel ash, but not oak) where misted regularly by sprinklers (look for the green stain of algae). The ash in the yard of 874 S Oakland, the camphors on the north side of Fillmore between Euclid and Los Robles, and the date palms east of the entrance to Huntington Hospital are all particularly good places to see it. The apothecia are generally less than 1 mm wide.

Images

17838
Apothecia at 30x under dissecting scope.
17839
17840
17841
Apothecial section mounted in water, taken at 100×. Photo taken of material collected near Wells Gray Provincial Park, British Columbia, Canada.
17842
Asci and spores, mounted in water, taken at 1000×. Photo taken of material collected near Wells Gray Provincial Park, British Columbia, Canada.
17843
These photos were taken of material also collected in urban Pasadena, at 10x and 30x magnification.
17844
These photos were taken of material also collected in urban Pasadena, at 10x and 30x magnification.

Proposed Names

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Comments

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Lemonade from lemons!
By: Debbie Viess (amanitarita)
2008-08-19 13:26:27 CDT (-0400)

Talk about making the most of what you have…glad to hear that at least some of our lichens are pollution tolerant; there’s certainly plenty of selective pressure to favor this species in urban and surrounding areas. Hope we don’t see more of it in montaine habitats throughout the Sierra…Sequoia/Kings Cyn., towering above the Central Valley, has some of the worst air quality in the Nation! A dubious distinction…

Created: 2008-08-19 02:01:25 CDT (-0400)
Last modified: 2008-08-19 02:01:25 CDT (-0400)
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