Notes: 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|
|User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote.|
|I’d Call It That||3.0||6.42||1||(jason)|
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Created: 2009-05-31 16:27:46 EDT (-0400)
Last modified: 2009-05-31 16:27:46 EDT (-0400)
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