Pseudocyphellaria norvegica chemistry

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Caz Walker
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Pseudocyphellaria norvegica chemistry

Post by Caz Walker » Fri Feb 14, 2020 9:05 pm

Hi
I have a specimen of what I'm pretty sure is Pseudocyphellaria norvegica collected in Argyll two weeks ago. Both in the field and back at home the chemistry of the medulla is consistent: C-, K+ pink or red, KC+ pale orange. According to Dobson this should be C+ red. I've tested mature very sorediate large lobes and smaller young lobes with similar results. This isn't the first time this has happened - P norvegica has been C- on other occasions. I assumed I'd done something wrong.

Theses reactions don't match any of the Pseudocyphellarias. Why do I think it's this genus? - underside covered in dark tomentum with indistinct pseudocyphellae, ruling out Nephroma which is bare and Sticta which has more distict cyphellae and no chemical reactions. I've checked that the bleach is OK - Punctelia subrudecta medulla shows red.

Has anyone any suggestions for the C- and K+ red reactions? Have I gone horribly wrong somewhere?

Thanks in advance
Caz Walker
P norvegica growing amongst bryophytes on outcrop
P norvegica growing amongst bryophytes on outcrop
It was very wet so the K+ red reaction spread out
It was very wet so the K+ red reaction spread out
K+ red reaction with KC+ orange reaction on the right
K+ red reaction with KC+ orange reaction on the right

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