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Åge Oterhals

I found this pyrenomycetous fungi in pine forest o

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Hi All, I found this Octospora growing with liver

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Hello.A fungus growing on the surface of a trunk o

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Hello.Small, blackish, mucronated surface grains s

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Hello.A tiny fungus shaped like globose black grai

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Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia (España) 

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Castillo Joseba Castillo Joseba

me mandas el material seco de Galicia (España) re

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Francois Guay Francois Guay

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BonjourRécolté sur une brindille au fond d'un fo

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Melanomma-like on Salix
Gernot Friebes, 26-05-2015 11:53
Hi,

I'm not sure where to place this fungus which I found last week on a branch of Salix ca. 1.5 m above the ground. Hopefully I'm not just missing something obvious here! The ascospores are smooth, thin-walled, light brown, 4-septate with the second cell from the top being the broadest, measuring 21.6–23.2 x 8,3–9,0 µm. No sheath observed. Asci are bitunicate, 8-spored, with ascospores being arranged somewhat uni- to bi-seriately. Hamathecium filaments are up to 4.6 µm wide. Any ideas or suggestions?

Thank you and best wishes,
Gernot
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DirkW, 26-05-2015 19:27
DirkW
Re : Melanomma-like on Salix
hi gernot,

the spores are long. perhaps you have to search in genus thyridaria?

best

dirk
Björn Wergen, 26-05-2015 20:12
Björn Wergen
Re : Melanomma-like on Salix
Hi all,

no, Thyridaria fbs are always embedded +/- into host surface (or into a valsoid stroma) and there are furthermore only a few species with spores >20µm. I think this is a Melanomma, did you check Holm?

regards,
björn
Gernot Friebes, 26-05-2015 21:40
Re : Melanomma-like on Salix
Hi Dirk & Björn,

thanks for your suggestions! I did check Holm but to no avail. However, I found a species in Mathiassen (1989) that fits relatively well: Leptosphaeria hendersoniae (now Plenodomus hendersoniae). Mathiassen even mentions that some collections of this species "have been wrongly identified as Melanomma pulvis-pyrius".

The ascospores are a bit longer in Mathiassen (20.5–27(30) x 7–9.5 µm, mean 24.6 x 7.9 µm) so I will check that again but I'm fairly certain that this is a good track.

Best wishes,
Gernot
Björn Wergen, 27-05-2015 00:07
Björn Wergen
Re : Melanomma-like on Salix
Yes, indeed the species has a leptosphaerioid appearance. I wonder about the habitat, perhaps Plenodomus is a good name for it.

regards,
björn