Observation 13102: Pertusaria velata (Turner) Nyl.
When: 2006-06-30
Herbarium specimen reported

Notes: Crust lichen, on hardwood bark.
THALLUS: pale gray, rimose to verruculose, K-, C-, KC-?
MEDULLA: white, K-, C+ red, KC+ bright red turning orange then fading
ALGAE: green
APOTHECIA: lecanorine, adnate but very raised, disk sunken and yellow, becoming very powdery white pruinose almost immediately, hymenium clear
SPORES: 1 per ascus, huge, 200 × 40 µm or more!, walls smooth, 10 µm thick, not textured inside
PARAPHYSES: very thin, colorless, not expanded, much branched

Check out those spores!! Wish I had a photo of the thallus, but still, not every day you see spores fully one quarter of a millimeter long! — literally visible with the naked eye.

Proposed Names

87% (1)
Eye3 Eyes3
Used references: Brodo: pruina, chemistry, spore size
Based on microscopic features: 1 spore per ascus, 250 µm long(!)
Based on chemical features: medulla C+ and KC+ red

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2008-10-25 20:00:02 PDT (-0700)
Last modified: 2008-10-25 20:00:02 PDT (-0700)
Viewed: 54 times, last viewed: 2016-10-24 22:01:31 PDT (-0700)