Observation 74969: Lichen P. Micheli

When: 2011-08-30

Collection location: Forest near Elgin St., Pembroke, Ontario, Canada [Click for map]

45.806696° -77.138456°

Who: Paul Derbyshire (Twizzler)

No specimen available

Yellow-orange thallus. No apothecia. Looks somewhat different from Xanthomendoza hasseana’s. On the same quaking aspen in Zone 14, though.

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Add Comment
By: Paul Derbyshire (Twizzler)
2011-08-31 08:12:12 CEST (+0200)

Unfortunately, I doubt my camera is capable of quite that high a resolution. Heck, I’m not sure my eye is.

Oh, and a thumbnailed link would be better than wrecking this observation’s page layout for those of us not using a 46" wide-screen TV as computer monitor. ;) Yes.

Well, here’s a close-up of X. mendozae
By: Jason Hollinger (jason)
2011-08-31 07:45:08 CEST (+0200)
Those aren’t soredia
By: Paul Derbyshire (Twizzler)
2011-08-31 07:37:34 CEST (+0200)

they’re JPEG artifacts. Got a closer shot, and/or with higher JPEG quality? :)

Little granules
By: Jason Hollinger (jason)
2011-08-31 07:25:12 CEST (+0200)

Soredia are formed when the lichen “disintegrates” or breaks down into a pile of cottony granules or powdery stuff. Technically they’re formed by the hyphae of the inner layer of the thallus (the medulla). In the case of Xanthoria sensu lato, the medulla is orange just like the outer surface (cortex), so just look for orange “soft”-looking granules. Here’s sort of what yours should look like when fully mature:

I might do that…
By: Paul Derbyshire (Twizzler)
2011-08-31 06:56:32 CEST (+0200)

…if I even knew what soredia were. :)

This does look different
By: Jason Hollinger (jason)
2011-08-31 06:50:40 CEST (+0200)

Definitely in Xanthoria or Xanthomendoza, but not sure which species. Absence of apothecia in something this small isn’t necessarily meaningful, but you only have a few choices among fertile species: X. hasseana and X. montana, which we’ve ruled out, X. polycarpa (forms mounds, not sprawling rosettes), and… others even more obviously wrong (e.g., X. parietina). So it probably will develop soredia eventually, but where? X. ulophyllodes is a possibility (the photo in Brodo isn’t a bad match, actually). X. fulva is a small colonial thing, not apt to form nice well-defined lone rosettes. X. oregana looks different, but I’m not familiar with either oregana or ulophyllodes. I’d say look for soredia under the lobe tips.

Created: 2011-08-31 04:40:46 CEST (+0200)
Last modified: 2011-08-31 04:43:15 CEST (+0200)
Viewed: 45 times, last viewed: 2017-06-10 03:03:30 CEST (+0200)
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