Lichens on the York City Walls

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jimmymac2
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Lichens on the York City Walls

Post by jimmymac2 » Sat Nov 21, 2015 9:24 am

Was site seeing for a bit yesterday and walked along one section of the York City Walls (near Monkbar). I didn't have any equipment with me apart from my camera and some binos that I had just won, so all I took were photos. I don't know what type of stone the walls are made of, I suppose it varies. Sorry about the quality of photos as well: my lens clouded up as it is not used to the sudden cold.
DSCN0346r.jpg
(the large grey one and the orange leprose one surrounding it)
DSCN0347r.jpg
Xanthoria?
DSCN0348r.jpg
DSCN0345r.jpg
DSCN0330r.jpg
DSCN0337r.jpg
Always keep your eyes open... :shock:

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Chris Yeates
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Re: Lichens on the York City Walls

Post by Chris Yeates » Sat Nov 21, 2015 8:00 pm

Hi James
Hope the weather wasn't too bad for you - it was a bit hit and miss further west . . . today would have been better weather-wise.
I make no claims to being a lichenologist but I think that the larger lichen in images #1 and #3 is Lecanora muralis, and the crustose one in #1 could well be Candelariella vitellina.
To help the real lichenologists the majority of York's walls are mediaeval and constructed of magnesian limestone, the nearest occurrence of this rock being around 9 miles away. This is a dolomitic limestone and much more resistant to atmospheric acid rain than is carboniferous limestone. The Romans, who constructed the original walls (little of which survive now), must have been delighted to find it as dolomite was much used in Rome for statuary.

cheers
Chris
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"

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jimmymac2
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Re: Lichens on the York City Walls

Post by jimmymac2 » Sat Nov 21, 2015 8:25 pm

Hi Chris,
Thanks for the ID's and information. I did look at C.vitellina when trying to identifiy the orange lichen in #1, so I do agree with you. Let's see if anyone else has any opinions.
Regards,
James
Always keep your eyes open... :shock:

diggleken
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Re: Lichens on the York City Walls

Post by diggleken » Wed Dec 02, 2015 2:51 pm

Hi chaps, great to see Lichens featuring!
The white one is probably Aspicilia calcarea, the black end one is probably a Verrucaria sp maybe nigrescens but there are others -both of these are common on limestone, so that was helpful Chris - I suspect the yellow dots are Caloplaca holocarpa but they need to be closer and sharper I feel and Chris is right with Lecanora muralis and you with Xanthoria parietina.
Unsure about the black dots, just not clear enough.............
You can do worse than carry some KoH solution round with you in a tiny dropper bottle - invaluable as a reagent with many Lichens.
Cheers
Ken

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jimmymac2
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Re: Lichens on the York City Walls

Post by jimmymac2 » Fri Dec 04, 2015 6:15 pm

Thanks Ken!
I do have some KoH but I didn't expect to use it on that particular day!
James
Always keep your eyes open... :shock:

diggleken
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Re: Lichens on the York City Walls

Post by diggleken » Sat Dec 05, 2015 7:02 am

Ah, yes, good point, not something most folk wander about with anyway! ;)

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