Observation 72978: Lichen P. Micheli

When: 2011-07-24

Collection location: Blue Mound State Park, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

No specimen available



Proposed Names

31% (2)
Eye3 Eyes3
Recognized by sight
2% (2)
Recognized by sight

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By: Jason Hollinger (jason)
2016-01-18 21:00:25 CST (-0500)

I just wasted an entire day trying to sort out four specimens of Xylographa. My tolerance for difficult specimens is at an all-time ebb! :)

I’d like it to be something else too! Kinda tired of L.thysanophora.
By: Andrew Khitsun (Andrew)
2016-01-18 20:48:37 CST (-0500)

I don’t know if it matters, but I find these in the stream channels and other places occasionally inundated by water. I have some other photos from different places. To the best of my (tiny) knowledge L.thysanophora usually grows on rock faces in wettish places, but not where it can be inundated. I might be wrong… but glad you have a specimen to pour over.

Alas, then I have to disagree with Lecanora thysanophora
By: Jason Hollinger (jason)
2016-01-18 01:29:19 CST (-0500)

I found completely negative spot tests: K- C- KC- P- UV-. L. thysanophora should be KC+ gold. I can try to dig up the specimen later and double-check the spot test. (Probably triple-check, I’m sure I would’ve double-checked them at the time, since it looks so much like L. thysanophora and would’ve wanted very badly for it to work out that way! :)

You got it :)
By: Andrew Khitsun (Andrew)
2016-01-18 01:21:45 CST (-0500)
Is this 7242011-1?
By: Jason Hollinger (jason)
2016-01-18 01:10:38 CST (-0500)
There are others…
By: Jason Hollinger (jason)
2012-02-19 20:00:04 CST (-0500)

I just can’t think of them off the top of my head! I particularly remember seeing fibrous/webby prothalli on some tropical crusts.

By: Andrew Khitsun (Andrew)
2012-02-19 19:26:20 CST (-0500)

I can clearly see webbing on the outher edges, after examining these and few more photos that I have. I wonder how many lichen have that kind of webbing. I just compared this specimen’s photo with that of Lecanora thysanophora on rock, and the two don’t look similar. On the other hand, if there is no other lichen with webbing on thallus (prothallus?), it’s got to be L.thysanophora. Perhaps, type or rock substrate affects the look of it. On the other hand, my L.thysanophora are from shady cliffs, but these always grow on boulders in creek beds (perhaps in need of periodical inundation?)

By: Jason Hollinger (jason)
2011-08-19 02:37:03 CDT (-0400)

Good point about variability in substrate preference. There are a few good indicator groups – some Collema species grow exclusively on calcareous rocks, for example, and Umbilicaria would never be caught dead on limestone – but there’s a whole field in between which just has preferences, no hard-and-fast rules.

As for intertwining, I’ve read about multiple species of Cladina seen growing together inextricably. Also, it’s been observed in a number of species I think, that multiple fungi are found to compose a single thallus (probably all the same species, though). Lichen sex is messy.

Everything’s possible
By: Andrew Khitsun (Andrew)
2011-08-13 21:07:03 CDT (-0400)

Maybe two species are involved – you never know without testing. Even more obvious and clearly different species of lichen sometimes intertwine like if it were one, let alone can grow next to each other. On the other hand, here is a quote from Brodo regarding non-related to this observation Physcia phaea:
“On granitic (less commonly, calcareous) rocks…” So some species probably do inhabit different types of rock, just like some species can grow both on tree and rock, respectively organic and inorganic substrate. I wonder what the name is for lichens growing on metal?

By: Jason Hollinger (jason)
2011-08-01 13:46:09 CDT (-0400)

But no clue. I’d have to use the sterile crustose key, meaning chemistry is of primary importance to even get to the right section. I could see it being a Lecanora, Pertusaria (on rock, though?), … problem is, I just don’t know the sterile forms of most crustose genera at all. (Remarkable to find such a thin crust capable of growing on both acidic and basic rocks. I’d suspect two different species until quite proven otherwise, no matter how apparently similar.)

On different rocks
By: Andrew Khitsun (Andrew)
2011-07-31 21:20:51 CDT (-0400)

These are on differnt types of rocks in a creek bed. The ones pictured are on (probably) quartzite (granite?), but limestone had the same species growing on it too.

Created: 2011-07-31 21:05:12 CDT (-0400)
Last modified: 2016-01-18 23:50:47 CST (-0500)
Viewed: 90 times, last viewed: 2017-06-09 19:24:40 CDT (-0400)
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