Observation 80653: Stereocaulon paschale (L.) Hoffm.

When: 2011-10-25

Collection location: Hörnefors, Västerbotten, Sweden [Click for map]

Who: Irene Andersson (irenea)

No specimen available

Growing on sandy soil


Not easy to get close enough..

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Recognized by sight
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Add Comment
By: Jason Hollinger (jason)
2011-10-26 21:21:17 -03 (-0300)

Shows my ignorance of Portuguese geography. :(

Maybe not that far away!
By: zaca
2011-10-26 19:34:17 -03 (-0300)

The portuguese checklist (the one that Jason already knows) has two species:
Stereocaulon alpinum and S. evolutum. Probably the were found in our highest mountains, Serra da Estrela (about 2000m high).

Of cephalodia and phyllocladia
By: Jason Hollinger (jason)
2011-10-26 19:21:21 -03 (-0300)

What little I know about Stereocaulon:

1. Check the main stems for woolly tomentum – this one has smooth stems.
2. Diagnose the shape and attachment of the “leaves” (phyllocladia) very carefully – this specimen looks to have “granular” phyllocladia.
3. Look for apothecia, and whether they are only at the tips of branches or scattered all over – this has none.
4. Look for cephalodia, which can be abundant to almost absent, gray or brown, hidden in tomentum of stem or readily visible underneath the “leaves”, smooth to brain-like to “fuzzy”, and so on. In this they are the small dark greenish-gray blobs, several are visible in the second photo.
5. Check how it is attached to the substrate. Some are firmly attached directly to rocks and very difficult to remove; that’s one group. The other group is loosely attached to soil or moss or thin debris over rock. S. paschale should grow on soil. There are also crustose species, and low mat-forming species (alpine).
6. Lastly, some have powdery or granulose soredia at the tips of the branches.

There should be a dozen or more species in Sweden. Good luck! :)

That’s a slippery slope
By: Jason Hollinger (jason)
2011-10-26 19:09:00 -03 (-0300)

That’s how I got hooked on lichens, too. Couldn’t find anything else to look at in winter in the Great Smoky Mountains. :)

Stereocaulon is exclusively boreal and arctic. The closest to Portugal will probably be in the high Pyrenees. Easily one of the most difficult macrolichen genera. Not sure there’s anyone who pretends to be able to identify every specimen confidently without TLC and luck.

Welcome to the club!
By: zaca
2011-10-26 18:20:30 -03 (-0300)

Quoting Irene:
“This is all new to me, but I thought if would be fun to start looking at some lichens now when the mushroom season comes to its end here…”

My mushroom season did not start yet!

Thank you, both
By: Irene Andersson (irenea)
2011-10-26 17:35:39 -03 (-0300)

zaca, for the links! I have been looking closely at Stridvalls gallery (makes best sense for me to compare with because their collections are swedish too).

and Jason, I saw your obs here of paschale, very good photos! They made me convinced that we had the same species. I suppose that the greenish ragged flakes here and there are what you call cephalodia.

This is all new to me, but I thought if would be fun to start looking at some lichens now when the mushroom season comes to its end here…

Always learning
By: zaca
2011-10-26 17:23:42 -03 (-0300)

with someone (in this case, Irene) observations. I can hardly wait to find my first Stereocaulon.

Look at the cephalodia
By: Jason Hollinger (jason)
2011-10-26 16:11:26 -03 (-0300)

I guess this was Irene’s reasoning, at least: the little gray cephalodia seen in the second photo are fuzzy or like little pom-poms. That’s characteristic of S. paschale.

I don’t known
By: zaca
2011-10-26 14:57:56 -03 (-0300)

much about Stereocaulon and, in fact, I never saw one. Related with your specimen what I could see is that there are quite a number of species morphologically very similar. You can find more information in the links bellow, the first of which mentions the chemical reactions of some species and can be useful to separate between them, the second and third with very nice photos.
Good luck.
Irish lichens, Stridvall, Sharnoff.

Thanks, zaca!
By: Irene Andersson (irenea)
2011-10-25 13:32:55 -03 (-0300)

I had no idea where to look. Stereocaulon botryosum maybe?

Maybe Stereocaulon.
By: zaca
2011-10-25 13:27:53 -03 (-0300)

Created: 2011-10-25 13:22:26 -03 (-0300)
Last modified: 2011-10-26 16:08:29 -03 (-0300)
Viewed: 89 times, last viewed: 2018-07-16 04:32:49 -03 (-0300)
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