Hi,
This Hypoxylon-like stromatic ascomycete was on a hardwood log in mixed woodland – including Oak, Birch, Beech, Sycamore, Pine, Rowan. Although Annulohypoxylon multiforme was also found on Birch close by, this fungus looked too effused and spreadiing to be that. I used a BMS key and Field Mycology articles which seemed to suggest either Annulohypoxylon cohaerens or multiforme (ostioles papillate).
The KOH-extracted pigment looked somewhat greenish-brown using an LED microsope, but using Geoff Kibby's Russula colour chart as a reference shows it to be dark brown.
Thickness of the stroma was about 2mm.
Spores dropped were 9-12 x 4-5. I was unsure whether the germ-slit was full-lenght or not – my microscope is probably not good enough to show this.
Asci approx 15 x 5-6, blueing in Lugol, 8 spores, uniseriate.
Paraphyses not clear.
Is this simply a rather resupinate form of Annulohypoxylon multiforme?
Cheers,
Steve