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02-05-2024 20:04

Hypoxylon fuscum

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éric ROMERO

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Bernard CLESSE

Bonsoir à toutes et tous,J'ai trouvé ce matin ce

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)?

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

Björn Wergen, 16-03-2014 09:25

BjÃ¶rn Wergen

Re : Pale pyrenomycete with Tubeufia like spores

I have studied this collection and come to Conioscyphascus varius.

regards,
björn

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

BjÃ¶rn 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

BjÃ¶rn 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

BjÃ¶rn 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