Observation 6830: Lecania dubitans (Nyl.) A.L. Sm.
When: 2008-01-24
Herbarium specimen reported

Notes: Extremely abundant crust lichen on aspen in this region. They literally change the color of the forest: the aspen would not look nearly so white from a distance were it not for this powdery white lichen.

Black apothecia with brown epihymenium, and hyaline hymenium, hypothecium and subhymenium. Algae in either the exciple or in the amphithecium (in which case the exciple has essentially disappeared). Spores hyaline, septate, bent/bean-shaped, 8 per ascus.

Images

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11618
Apothecial section, at 400×.
11619
Somewhat immature, bean-shaped spores among IKI-stained asci, at 1000×.

Proposed Names

87% (1)
Eye3 Eyes3
Used references: Brodo, Irwin. 2001. Lichens of North America.
Based on microscopic features: Bent, septate, hyaline spores; algae in apothecia.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-02-18 19:48:50 CST (-0500)
Last modified: 2008-02-18 19:48:50 CST (-0500)
Viewed: 20 times, last viewed: 2016-03-20 12:36:03 CDT (-0400)