White Crustose Lichen

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Chris Johnson
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White Crustose Lichen

Post by Chris Johnson »

This 'snow-white' lichen was found on a vertical face of granitic rock close to a seepage.

It was the only patch and I failed to get anything useful to sample. With its distinct fragmented apothecia, I thought it might be identifiable, but no joy.

Does anyone recognise it?

Thanks, Chris
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JennyS
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Re: White Crustose Lichen

Post by JennyS »

Hi Chris - it might be worth considering Herteliana gagei: http://fungi.myspecies.info/all-fungi/herteliana-gagei
Jenny Seawright
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Re: White Crustose Lichen

Post by Chris Johnson »

Thanks Jenny, that sounds a real posibility. The small fragment I managed to chip off was barren. I'll try and get back soon and have another look although it sound s as if mature apothecia are scarce.

This is a bonus as I wasn't expecting much; more a bid to keep this lichen section going. I'll post another tomorrow.

Chris
JennyS
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Re: White Crustose Lichen

Post by JennyS »

Did you check the thallus for K, C and KC reactions as if not would be worth doing when you go back - and please keep on posting lichen photos and queries!
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Re: White Crustose Lichen

Post by Chris Johnson »

JennyS wrote: Sat Jan 19, 2019 5:53 pm Did you check the thallus for K, C and KC reactions as if not would be worth doing when you go back - and please keep on posting lichen photos and queries!
No, I didn't. Christine has the testing kit. We will take it next time.

Chris
Paul Cannon
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Re: White Crustose Lichen

Post by Paul Cannon »

Jenny's Herteliana suggestion is worth following up. The thallus is described as pale duck-egg blue but the colour isn't always well developed.

Or it could be one of the Opegrapha species that are lichen parasites, which would account for the irregular apothecia.

You are sure that the white is a lichen thallus and not a quartzite extrusion?

Best wishes
Paul
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Chris Johnson
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Re: White Crustose Lichen

Post by Chris Johnson »

Definitely a lichen thallus, I'll do some tests on my next visit.

I hadn't considered Opegrapha as I thought the ascocarps were all lirellate.

With thanks, Chris
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Chris Johnson
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Re: White Crustose Lichen

Post by Chris Johnson »

JennyS wrote: Sat Jan 19, 2019 5:53 pm Did you check the thallus for K, C and KC reactions as if not would be worth doing when you go back - and please keep on posting lichen photos and queries!
Hi Jenny
Managed to get back and find another patch close by. Tests on both patches are C-, K+ yellow, Pd+ yellow. Also got a spore-drop which all fit with Lecidea phaeops. Very close to your suggestion.
Thanks, Chris
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JennyS
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Re: White Crustose Lichen

Post by JennyS »

Hi Chris - delighted you've a positive identification for it
Jenny Seawright
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