Observation 130171: Cladonia P. Browne
When: 2013-02-16
Who: zaca
No herbarium specimen

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I’ve found cases…
By: Jason Hollinger (jason)
2013-03-14 22:54:21 GMT (+0000)

… of very strong concentration of fumarprotocetraric acid which give K+ “muddy” red reaction, remarkably strong on occasion. (Especially common, for example, with C. caespiticia.) In these cases adding C doesn’t necessarily clear the red. (In fact I’m convinced that there’s even a faint KC+ reddish reaction in such cases, as if mixed with protocetraric acid.)

In other words, though by no means authoritative or conclusive!, it is possible that this is just a C. pyxidata / C. pocillum with unusually strong fumarprotocetraric acid. Something to bear in mind, at least. Until we get rich and can afford to build a private TLC lab in the spare room. :)

By: zaca
2013-03-14 22:19:31 GMT (+0000)

as well as in any material that looks like C. pyxidata or C. pocillum, because either species should have negative spot tests, and in most of my observation I get reactions like these.

Looks like C. pyxidata
By: Jason Hollinger (jason)
2013-03-14 18:30:39 GMT (+0000)

Are you concerned about the K+ / KC+ red reaction?

Created: 2013-03-14 00:29:10 GMT (+0000)
Last modified: 2013-03-14 00:29:14 GMT (+0000)
Viewed: 20 times, last viewed: 2016-10-26 17:25:43 BST (+0100)
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