Bonjour,
On a trouvé un Hyphomycete et un Pyrenomycete en habitant ensemble, sur Fagus.
Le Hyphomycete resemble Cladobotryum mycophilum, et le Pyrenomycete resemble Chaetosphaeria inaequalis. Qu'est-ce ce passe?
Cordialement,
Steve

Hi,
As I'm looking at corticioids I took a specimen of this large "crust". Found 29/7/15, Longshaw Estate, Peak District, Northern England, altitude about 300m. It was on the underside of a Fagus log (or at least, on a log by a large felled Fagus) in mixed woodland on acid Carboniferous gritstone.
The "crust" was composed of a Hyphomycete and a Chaetosphaeria type Pyrenomycete. I wondered whether the Hyphomycete was the anamorphic state of the Pyrenomycete. However, I don't think it is.
From Ellis & Ellis the Hyphomycete looks to be close to Cladobotryum – with one-septate hyaline conidia up to 21 x 10 um, on conidiophores (to 500 long by 8 wide, with "head" about 100 um) with phialides, it looks rather like C. mycophilum.
The Pyrenomycete is up tp 0.2mm diameter, single small ostiole, associated with setae (septate, up to 200 long, about 5 wide with slightly swollen ends). The asci do not turn blue in Lugol, and are approx 100 x 5-6. They have an apical ring. Spores are single septate, up to 9x4.5, assymetrical, and appear to splt into two part-spores about 3x4.5 um. After several days some part-spores germinated. Paraphyses are thread-like and difficult to see. If this is a Chaetosphaeria then from Ellis & Ellis and Reblova (SIM 45, 149-168) the closest I get is to C. inaequalis.
As no species of Chaetosphaeria has an anamorph similar to the Hyphomycete present, I wonder if it is parasitsing the Pyrenomycete – although I appreciate that it has only been recorded on larger Basidiomycetes.
Microscopy in Methylene Blue.
Best regards,
Steve