Observation 113418: Lichenostigma cosmopolites Hafellner & Calatayud
When: 2012-08-16
Herbarium specimen reported


Copyright © 2012 Jason Hollinger (jason)
close-up of tiny ascomata and vegetative hyphae
Copyright © 2012 Jason Hollinger (jason)
close-up of vegetative hyphae
Copyright © 2015 Jason Hollinger (jason)
ascomata and vegetative hyphae
Copyright © 2015 Jason Hollinger (jason)
vegetative hyphae

Proposed Names

-29% (1)
Recognized by sight
31% (2)
Recognized by sight: spidery black network of superficial threads linking minute black lumps
76% (2)
Eye3 Eyes3
Used references: ID provided by Jason Hollinger

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
This is usually found on Xanthoparmelia spp.
By: Jason Hollinger (jason)
2015-12-18 00:28:01 CST (-0500)

So it’s worth documenting why I feel certain this is the same species, even though it’s growing on Punctelia graminicola instead:

ascomata: ~50um tall by 75um wide
hymenium: I+ orange-brown, K/I+ faintly bluish
asci: ~25×15um, thick K/I- tip (no ring structure seen)
spores: 8 per ascus, hyaline, smooth, halonate, ~9-10×3-3.5um

Thank you for awesome microscope photos.
By: Andrew Khitsun (Andrew)
2015-12-18 00:27:22 CST (-0500)

Lacking ability to do it myself, looks like we have good cooperative effort going on here for the sake of science!

Jason, this is #8162012-3,
By: Andrew Khitsun (Andrew)
2015-12-18 00:17:39 CST (-0500)

I hope you can post good microscopic photos of this beast!

By: Jason Hollinger (jason)
2012-10-14 19:21:24 CDT (-0400)

I can find only a few species recorded on Punctelia in any of my lichenicolous papers:

Abrothallus microspermus (no superficial hyphae)
Phacopsis oxyspora (no thallus at all)
Sphaeosporobolus usneae (???)

Yeah, it’s like we’re stumbling around in the dark…

Besides, strictly speaking, we’d need to see the spores at very least (in the tiny black dots).

Yes, this is a parasite
By: Jason Hollinger (jason)
2012-10-14 19:13:42 CDT (-0400)

The commonest one in this genus is Lichenostigma cosmopolites, which grows on Xanthoparmelia spp. quite frequently. I suspect it’s a different species if it’s on… Punctelia? Sonoran Flora doesn’t suggest any which grow on Punctelia. British Flora does seem to cover lichenicolous fungi as a rule. I have a whole stack of papers randomly covering species here and there for North America, but I’ve not taken the time yet to index them, so they’re kind of useless to me until then. Sigh.

What’s going on here?
By: Andrew Khitsun (Andrew)
2012-10-14 17:22:44 CDT (-0400)

I think I posted something like this, from the same location too, but I can’t find it now. Basically, this lichen is covered in net-like structure (fungus?), with tiny black spheres sitting on it here and there. While I lack magnification power to show this beautiful network, if you squint you can see net-like pattern on some lobes, and black dots on others. The pattern gets thicker towards the center of thallus, hence darker color there.

Created: 2012-10-14 17:15:09 CDT (-0400)
Last modified: 2015-12-18 00:24:15 CST (-0500)
Viewed: 75 times, last viewed: 2016-10-21 22:10:21 CDT (-0400)
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