Observation 21492: Peltigera aphthosa (L.) Willd.

When: 2009-05-16

Collection location: Edgewood Blue, Wells Gray region, British Columbia, Canada [Click for map]

Who: Jason Hollinger (jason)

Specimen available

Found this on Table Mountain Trail growing on mossy ground under lodgepole pines.

I was confused about this specimen since it very clearly has veins, but Trevor has finally cleared up this question for me: P. leucophlebia group has contrastive veins and interstices, at least near the margin, making for very obvious veins; in P. aphthosa group the veins (if present at all) are the same color as the interstices and are typically broader and less raised, mking them much less apparent at a casual glance.

Also note the “silver lining” on P. aphthosa — there is a minutely curled-up or thickened edge showing a line of the cottony white underside. And the cephalodia of P. apthosa are broader and supposedly flatter than in P. leucophlebia — I’d describe them as the same height, but the ratio of height to width is much lower, same difference I guess.

P. aphthosa group P. leucophlebia group
upper surface emerald green to light gray emerald green to light gray
margins even to gently undulating strongly to weakly but tightly crisped
edge ~thickened, white-cottony border visible from above abrupt, clean, unthickened
cephalodia broad, scalloped, proportionately flat tiny, proportionately high, hemispherical
veins absent to broad and low, colored same as interstices narrow, raised, conspicuously contrastive
rhizines less abundant, often shorter, more scattered abundant, long, often following veins



Proposed Names

87% (1)
Eye3 Eyes3
Used references: Trevor Goward

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2009-05-31 21:27:46 BST (+0100)
Last modified: 2009-05-31 21:27:46 BST (+0100)
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