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Amicodisca species on Quercus wood
Enrique Rubio, 25-05-2015 13:49
Enrique Rubio

Hi again

This Amicodisca species grew on wood, under the bark of a 10 cm thick branch of Quercus petraea lying on the ground at 950 m of altitude. The apothecia, 0.2-0.4 mm broad, have a greyish brown hymenium and very pale yellowish hairs with lumps of a resinous sustance. They are macroscopically not well preserved due to the dry weather but the microscopical characters are in good condition.

I feeel this fungus is very close to Amicodisca svrcekii a fungus with wide apical pore faintly MLZ +, spores ellipsoid to suballantoid, aseptate, containing 2 polar lipid guttules, 8-11 x 1.8-2.5 as described by Raitviir and Huhtinen. Two Baral's drawings show ascospores 8.5-14 (-17.7) x 2.7-3.2(-3.5)  asci IKI 3bb and 8-10-11.5 x 2.6-2.9 asci IKI 3rb respectively and another one by Stip 10-14.5-3-4 asci IKI bb. In all these cases the ascospores show many small guttules and asci lacking croziers.

But my collection have ascospores 6.1-9.1 x 2.1-2.9 with scanty guttules, asci not arising from croziers and in special way CONSISTENTLY IKI NEGATIVE EVEN AFTER KOH-PRET.

For it I wonder if this character is sufficient as to consider this fungus as a different species

Thanks in advance for your opinion


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Didier ARGAUD, 25-05-2015 17:08
Re : Amicodisca species on Quercus wood
les incrustations des poils se disolvent dans KOH et la preparation devient jaune-vert chez amicodisca virella, mais ici les poils ne sont pas jaune d'or.
Alors Amicodisca ? Je ne sais pas!

Hans-Otto Baral, 25-05-2015 18:11
Hans-Otto Baral
Re : Amicodisca species on Quercus wood
Enrique Rubio, 25-05-2015 18:54
Enrique Rubio
Re : Amicodisca species on Quercus wood

Hi Didier and Zotto. As my pic shows the ascomata grow among conidiophores of a dematiaceous mould. So Dematioscypha dematiicola is a good choice.


Enrique Rubio, 25-05-2015 19:25
Enrique Rubio
Re : Amicodisca species on Quercus wood
Sorry. Perhaps Dematioscypha richonis var. olivacea is a better name for it.
Didier ARGAUD, 25-05-2015 19:55
Re : Amicodisca species on Quercus wood
ca me va tres bien

Stip Helleman, 26-05-2015 00:27
Stip Helleman
Re : Amicodisca species on Quercus wood
Yes, the brown excipulum with irregular wall thickness as shown is also typical for Dematioscypha.