Disco on Malus wood - Forum ASCOFrance

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Disco on Malus wood

Stefan Jakobsson, 05-05-2022 23:21

On the surface of a decorticated branch of Malus recently cut off from a standing tree there were some up to 0,4 mm long fruiting bodies of a more or less elliptic fungus for which I have no good ideas left. Young frbs are covered with a dark brown layer which later seems to break up and form a dark margin around the yellowish brown disc.

The spores are one to three times septate and at times germinating alredy in the ascus, 16.9-21.4 × 6.5-7.6 µm, with one large guttule in each cell. The asci are 50-76 × 12-16 µm, apex blue with and without pretreatment. The parafyses are agglutinated, best observed in ammoniacal CR, branched.

Any ideas what this could be? Southern Finland.

Hans-Otto Baral, 06-05-2022 09:56

Re : Disco on Malus wood

This looks much like a relative of Durella atrocyanea, for which i tentatively use Xylogramma (see my folder "Durella group"). But with its amyloid apical rings it is a very unusual species in Xylogramma. The only I have in my subfolder (from Asturias) has longer and narrower spores with less oil, and also has VBs in the paraphyses. Lots of un- or little known species exist in these drough-tolerant discos!

Stefan Jakobsson, 06-05-2022 21:43

Re : Disco on Malus wood

Thank you! Atrocyanea and the Asturian one are undoubtedly close.

I note the my photos went into the Asturian folder - by mistake I presume.

Hans-Otto Baral, 06-05-2022 22:04

Re : Disco on Malus wood

Well noticed :-)

Now corrected

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