Hypoxylon-like fungus

[SheffieldLass]

I found these on felled birch. Hypoxylon multiforme was on the top surface of the branches and these more distinct blobs were on the underside and sides.

Hypoxylon multiforme above, unidentified one below



The fungus does not have dissolvable pigments in KOH 10% (in water they certainly are soluble though, blood red), which appears to rule out Hypoxylon. Spores are typically 8.1-9.2 x 3.9-4.4 um Qav 2.1.
Perithecia 300-400 x 190-290um.

If the pigments had been soluble in KOH I'd have thought these were H howeanum. Any ideas?

Melanie

P.S. The red in the spore picture is the pigment soluble in water.

[SheffieldLass]

I've just tried a bit of Hypoxylon multiforme in KOH 10% and that doesn't seem to be releasing any pigment either. Now where did get the KOH from? I clearly wasn't sold water instead of KOH as the H multiforme releases loads of pigment in water too .... I think it was from Brunel Microscopes, so it should be what it says it is. Anyone else tried these Pyrenomycetes in KOH?

I suspect that the one I couldn't name is H howeanum (or H howeianum as some seem to spell it) after all.

Melanie