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18-09-2025 16:14

Literature request
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Pale pyrenomycete with Tubeufia like spores
Eduard Osieck, 21-02-2014 16:19
On a small Fraxinus branch under the bark whitish to pale brownish globose ascomata (0,35-0,4 mm) with hyaline spores each filled with about ten strongly refractive drops: 40-54 x 4-5 mu, slighty bend at the ends, 5 septa in Melzer but otherwise only one or two vaguely visible. Asci cylindric, biseriate, unitunicate?, 150-160 x 8 mu, apical ring.

The spores look like those of Tubeufia cerea but it could be compared with characteristic specimens of this species growing on the same branch. In other features quite different: size of ascomata, asci length, apical ring (lacking in Tubeufia?) and spore septation.


No satisfactory outcome with the Tubeufia key of Rossman (1987). And Tubeufia is bitunicate. Tubeufia or other genera to consider? Does somebody know Conioscyphascus (Reblova 2004)?

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Alain GARDIENNET, 21-02-2014 16:42
Alain GARDIENNET
Re : Pale pyrenomycete with Tubeufia like spores

Hi,


See in Diaporthales. Some genus are possible (Pleuroceras, Linospora, ...)


Could yopu show us an ascomata ?


Alain

Eduard Osieck, 21-02-2014 21:57
Re : Pale pyrenomycete with Tubeufia like spores
Hi,

Alain, thanks for your suggestion to make a photo, it forced me to look further.
I have found more ascomata under the bark, some partly immersed in the rotten wood.
They were coloured olive greenish.

More important this time I found several with a papilla (about half the size of the ascoma).
Furthermore the ascomata are soft and start to collapse after 10-15 minutes.

Here is a photo of an ascoma, bad quality but it gives an idea how it looks.

Eduard
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Björn Wergen, 16-03-2014 09:25
Björn Wergen
Re : Pale pyrenomycete with Tubeufia like spores
I have studied this collection and come to Conioscyphascus varius.

regards,
björn
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Jacques Fournier, 16-03-2014 14:54
Jacques Fournier
Re : Pale pyrenomycete with Tubeufia like spores
Hi Eduard, on your photo 5 the ascl apical apparatus looks like blueing at base. Is it true or just my imagination?
Cheers,
Jacques
Björn Wergen, 16-03-2014 15:36
Björn Wergen
Re : Pale pyrenomycete with Tubeufia like spores
Hi Jacques,

the species is IKI-, I have tested it. It only turns red in Congo.

regards,
björn
Alain GARDIENNET, 16-03-2014 15:51
Alain GARDIENNET
Re : Pale pyrenomycete with Tubeufia like spores
Good job Björn !
Björn Wergen, 16-03-2014 15:59
Björn Wergen
Re : Pale pyrenomycete with Tubeufia like spores
Thanks Alain, I like to work with strange pyrenomycetes :P
Alain GARDIENNET, 16-03-2014 16:22
Alain GARDIENNET
Re : Pale pyrenomycete with Tubeufia like spores

Yes, I remarked !


And about strange ascos, I just found Pleospora herbarum on lichen !!! (on Peltigera rufescens), absolutely incredible but it is true.


Alain

Björn Wergen, 16-03-2014 16:38
Björn Wergen
Re : Pale pyrenomycete with Tubeufia like spores
This is undoubtely the variety Pleospora herbarum var. peltigerae :P
Eduard Osieck, 16-03-2014 22:51
Re : Pale pyrenomycete with Tubeufia like spores
Hi all,

I am of course happy that this collection has got a name.
Björn did a very good job, very frustrating to find something with clear features without being able to identify it.
I had considered the genus Conioscyphascus but was much in doubt because the spores look much broader in the drawings of Reblova & Seifert. Also I did not note the rather long neck (see fig. 27).

Jacques, the ascus top was not amyloid as photo 5 suggests.
I will check the original and I will come back on this tomorrow.

EDuard