Observation 117454: Xanthoria elegans (Link) Th. Fr.

When: 2012-11-20

Collection location: Cabo Blanco, Santa Cruz, Argentina [Click for map]

Who: nastassja (Nastassja Noell)

No specimen available

Substrate: Granite

Habitat: Aridlands Coastal.

Description: effigurate margins, apothecia.

Notes: Appears most strongly on south side of rocks – similar with this and other Xanthorias at Isla de Penguinos, and Punta Norte — nitrogen rich air coming from the south… thats where the southern right whale migrates during summer after fasting up near here during the spring and nursing her young — there´s so little fish etc. up here for her to eat that it takes more energy to hunt for food up here compared to just fasting and then heading south to the fish rich waters around Antartica… maybe that´s where all the nitrogen is coming from!

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You win
By: Jason Hollinger (jason)
2012-11-22 00:49:45 CET (+0100)

See what I mean? These things are impossible to distinguish by photo! I could’ve sworn that was going to be a Caloplaca.

… Unless, of course, you’ve got multiple species in these photos and in the photos with the Ramalina. Always a possibility…

Found a sample with an underside…
By: nastassja (Nastassja Noell)
2012-11-21 23:52:14 CET (+0100)

And its a lighter yellow, but its not white, and it definately looks like a cortex… and oddly not as white as other Xanthorias that I´ve seen… but there´s definately a lower cortex and easy to see because the marginal lobes kinda turn up in certain areas, maybe that´s why its pigmented under there…

I’m finding it impossible to be confident about this group from photo
By: Jason Hollinger (jason)
2012-11-21 01:30:59 CET (+0100)

Always check the underside to see if it comes free from the substrate anywhere, or whether it is at most corticate just under the margins. Hapters (tiny stubby rhizines) would totally give the game away.

I’m leaning toward Caloplaca here (e.g., C. saxicola or C. impolita?) since the outer lobes are sort of spreading and fan-shaped. But X. elegans is apparently extremely variable if the photos on-line are to be trusted (they aren’t :).

Created: 2012-11-21 01:07:56 CET (+0100)
Last modified: 2012-11-22 00:48:25 CET (+0100)
Viewed: 34 times, last viewed: 2017-06-14 17:39:28 CEST (+0200)
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