Observation 211908: Annulohypoxylon Y.M. Ju, J.D. Rogers & H.M. Hsieh

When: 2015-07-18

Collection location: Serra do Tepequém, Amajari, Roraima, Brazil [Click for map]

Who: Susanne Sourell (suse)

No specimen available

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Thanks, Roo
By: Susanne Sourell (suse)
2015-08-10 11:55:49 PDT (-0700)

Very helpful.

By: Roo Vandegrift (Werdnus)
2015-08-10 11:54:19 PDT (-0700)

I usually use 3%.

KOH for ID
By: Susanne Sourell (suse)
2015-08-04 12:18:30 PDT (-0700)

Muito cool. I definitely will try that. KOH 3%, 20% or 40%? What do you recommend?

By: Roo Vandegrift (Werdnus)
2015-08-04 12:05:25 PDT (-0700)

I’m very tempted to guess that it’s A. nitens, based on the way that the outer layer of the stromata is wearing away to reveal the shiny carbonaceous layer around the perithecia. But, again, you’d really need the spores to know.

One thing you can do to help narrow these down without a microscope, though, is a KOH spot test — Annulohypoxylon have pigments that come out in KOH: just break a little piece off and put it in a drop of KOH and see what colours emerge. Green is most common, but yellows, reds, and purples will help narrow down the species possibilities considerably.

Created: 2015-08-04 10:35:04 PDT (-0700)
Last modified: 2017-07-22 15:45:45 PDT (-0700)
Viewed: 33 times, last viewed: 2017-07-22 16:33:02 PDT (-0700)
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