Lepra melanochlora?

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chriscant
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Joined: Mon Jan 28, 2019 9:29 am

Lepra melanochlora?

Post by chriscant »

Also on the same recent walk near Haweswater in Cumbria very close to the Mycoblastus affinis, Caz found this lichen which looks like Lepra (Pertusaria) melanochlora, also on a damp seepage outcrop facing east at about 500m asl.

It has a bitter taste. The grey thallus has almost no isidia at the edge. The isidia got larger towards the centre, sometimes peg-like but also fatter lumps. Some isidia weren't pale at the top but the lumps were paler. The peg-like isidia were 0.5mm wide and about 1mm high, so smaller than the spec asks for, but this could be because the specimen wasn't from the centre. Some of the peg-like isidia has sparse branches. Green photobiont about 8um round.

Medulla P+ orange-red.
C-
K+ yellow turning red.
KC+ fleeting violet.
I do have a nice wee video of it turning violet which I can share on Twitter in due course.

Does this look right?

It's down as NR so happy to send to someone for confirmation.

Chris & Caz
Attachments
In situ (with blue tinge)
In situ (with blue tinge)
In situ (with blue tinge)
In situ (with blue tinge)
Thallus with peg-like isidia
Thallus with peg-like isidia
Section of two isidia showing algae and medulla
Section of two isidia showing algae and medulla
K+ yellow -> red
K+ yellow -> red
Medulla P+ orange-red
Medulla P+ orange-red
Second lumpier piece
Second lumpier piece
KC+ fleeting violet
KC+ fleeting violet
Neil Sanderson
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Joined: Tue Jan 08, 2019 7:30 am

Re: Lepra melanochlora?

Post by Neil Sanderson »

What a wonderful lichen. I have not see this before but from your description it can not be anything else. A very good find and fills in an obvious gap in the British distribution.

All the best

Neil
Neil Sanderson
chriscant
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Joined: Mon Jan 28, 2019 9:29 am

Re: Lepra melanochlora?

Post by chriscant »

Great thanks. Nicola has also said she's OK with that id. It does seem plausible that it is in the Lakes, but nice to find. Ta, Chris
Paul Cannon
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Joined: Mon May 18, 2015 9:03 pm

Re: Lepra melanochlora?

Post by Paul Cannon »

Another nice find. I've taken the liberty of posting a couple of your images on the FGBI website, hopefully a little less ephemeral than the info in this forum. Hope that's OK. I'll try to do this for other notable finds in the future, though time is an issue as always...

Paul
chriscant
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Posts: 42
Joined: Mon Jan 28, 2019 9:29 am

Re: Lepra melanochlora?

Post by chriscant »

Yes, of course, that's fine, for any of Caz or my photos.
And if you want higher res versions, then let me know.
Thanks, Chris
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