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Discomycete Growing on Fruit Body of Diatrypaceae
Peter Thompson,
21-03-2014 13:26
I have been given some data and images of a discomycete which becomes yellowish brown and grows on fruit bodies of Diatrypaceae, in turn on bark of Ulmus.
The spore measurements are 14 x 1.5 - 2um. The 8-spored asci do not react when in contact with iodine. Paraphyses are very slender, with slightly swollen tips.
A suggested identification has been proposed - this is Phaeohelotium extumescens. I can find little information in the literature and nothing in Ascofrance to help with this species, which does seem to grow on decaying fruit bodies of Diatrype and Eutypa.
An image of the fruit bodies is attached, along with microphotos of a section through the apothecium and another showing the asci and paraphyses.
I wonder if anyone has any suggestions as to the identity?
Thank you,
With Best Wishes,
Peter.
Gernot Friebes,
21-03-2014 13:31
Re : Discomycete Growing on Fruit Body of Diatrypaceae
Hi Peter,
probably an Orbilia. Do you have photos of living ascospores?
Best wishes,
Gernot
probably an Orbilia. Do you have photos of living ascospores?
Best wishes,
Gernot
Hans-Otto Baral,
21-03-2014 16:33
Re : Discomycete Growing on Fruit Body of Diatrypaceae
Hi Peter
this is quite probably Orbilia carpoboloides = Habrostictis rubra. The paraphyses should be lanceolate at the top.
I fear the collector is used to mount straight in lethal media.
Is it a recent collection so that the material might be alive yet?
Zotto
this is quite probably Orbilia carpoboloides = Habrostictis rubra. The paraphyses should be lanceolate at the top.
I fear the collector is used to mount straight in lethal media.
Is it a recent collection so that the material might be alive yet?
Zotto
Peter Thompson,
24-03-2014 15:34
Re : Discomycete Growing on Fruit Body of Diatrypaceae
Hello Gernot and Zotto,
I did also wonder about whether this fungus was an Orbiliomycete, as the fruit bodies have a translucent appearance.
I have not received an image of living spores nor many spores outside the asci. I have attached one image received, showing them to be swollen at one end.
Habrostictis rubra is very possible, given that the the host is Ulmus, the pale margins and also the spore dimensions.
Thank you,
With Best Wishes,
Peter.
I did also wonder about whether this fungus was an Orbiliomycete, as the fruit bodies have a translucent appearance.
I have not received an image of living spores nor many spores outside the asci. I have attached one image received, showing them to be swollen at one end.
Habrostictis rubra is very possible, given that the the host is Ulmus, the pale margins and also the spore dimensions.
Thank you,
With Best Wishes,
Peter.
