Observation 118036: Menegazzia A. Massal.

When: 2012-11-26

Collection location: Llao Llao Parque Municipal, San Carlos de Bariloche, Río Negro, Argentina [Click for map]

-41.055° -71.54° 1015m

Who: nastassja (Nastassja Noell)

Specimen available

Substrate: Living Nothofagus bole, about 1m off ground.

Habitat: Older growth Nothofagus forest.

Description: bright lime green Usnea like color, long appresed lobes, black underside. Holes through cortex as well as what looks kinda like pustules and white areas kinda like maculae. Appears to have terminal soralia but these are totally frequent. No apothecia seen.

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Add Comment
By: nastassja (Nastassja Noell)
2012-11-27 04:51:26 WIB (+0700)

What to look for, definately learning process :) Agreed, I don´t feel confident with giving a species name either until I see more of those terminal soralia — that line isn´t pointing to a pustule that´s turning into a soralia, no no, its really hard to read the photo, and the specimen without a dissecting scope since theres only that one terminal soralia, but it reminds me of the labriform soralia of Hypogymnia physoides… just a couple millimeters to the right of the line.

You might be right
By: Jason Hollinger (jason)
2012-11-27 04:38:08 WIB (+0700)

If it does indeed have usnic acid, and you’re sure that bump you’ve pointed out is going to turn into soredia, then M. globulifera is the only choice. Sorry, I’m just conservative in this kind of thing. Color on photos is misleading, and stressed thalli like this could have odd swellings even though it’s not really sorediate species. Lack of apothecia might not be surprising in stressed thalli, either. Sorry to be negative, but I’d rather see better material before giving it a name. These observations are important, though, because they teach us what to look for next time. :)

Hopefully not too much of a yikes…
By: nastassja (Nastassja Noell)
2012-11-27 04:15:05 WIB (+0700)

when I went through Bjerks paper, which is just amazing, but within just a 3 hop game of hop scotch with the keys, landed on M. globufera – which fits really well as far as color (check out the bottom photos, its super neon green colored which I think is what folks are always talking about with Usnea, right? That color definition always throws me for a loop) but regardless its certainly not gray or gray-green, etc as the 9th key couplet gives.

The specimen I collected has at least one terminal soralia, but only that one I can see (check out the photo with the line pointing to it) and my field notes say terminal labriform soredia… but those laminal pustules, are those empty soralia? Gotta go back out there and check for more terminal soralia… or whether there is apothecia on others that I didn´t see…

Thanks for your help Jason :)

By: Jason Hollinger (jason)
2012-11-27 03:05:41 WIB (+0700)

Was just reading Bjerke’s synopsis (2005)… we need to know a great deal more about the structure of the soralia before we have a prayer! On median line of lobes or on margins near tip? Associated with perforations or not? On pustules or not? Pustules perforated? (not to be confused with soralia associated with perforations apparently!!) Not to mention chemistry, as well. Phew. Looks like “they” have a good grasp on Chilean/Argentinian species, though, so with good material we might have a chance…

Created: 2012-11-27 02:11:09 WIB (+0700)
Last modified: 2012-11-27 02:11:11 WIB (+0700)
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