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13-09-2025 14:10

Wim de Groot

We found this hymenoscyphus on rubus fruticulosis.

13-09-2025 15:43

Edmond POINTE Edmond POINTE

Bonjour Christian,J'ai trouvé deux spores ressemb

11-09-2025 16:57

Jason Karakehian Jason Karakehian

Our revision of Marthamycetales (Leotiomycetes) is

13-09-2025 14:01

Thomas Flammer

dark brown apothecia, splitIKI-Spores biguttulate

10-09-2025 23:53

Marcel Heyligen Marcel Heyligen

Found on Robinia pseudoacasia together with Diapor

10-09-2025 17:18

Blasco Rafael Blasco Rafael

Hola, encontre este estiercol de vaca estos apotec

02-09-2025 11:34

Thomas Læssøe

https://svampe.databasen.org/observations/10527903

07-09-2025 08:19

Josep Torres Josep Torres

Hello.Tiny pinkish discomycetes, photographed and

09-09-2025 12:07

Edmond POINTE Edmond POINTE

Bonjour amis mycologues,Trouvé sur moquette de ch

08-09-2025 19:07

ruiz Jose

Hola me pasan esta recolecta en madera de fraxinus

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Cryptosphaeria question
Chris Yeates, 30-12-2014 19:08
Chris YeatesBonsoir tous
recently while preparing a 'portrait' (see below) of the common Cryptosphaeria eunomia I noticed something which may be well-lnown but I have been unable to find any reference to it. Those who study this fungus may well know that at one stage of development of the asci they assume a ventricose shape, with a swollen central section, as the spores develop.
I noticed on this occasion that at a certain point in the ascospore development they can be clearly seen to have gel sheaths or some equivalent which separate them from their comrades in chambers, rather like clustered bubbles. This can be seen particularly in the middle right image, where the spores are mostly "end-on".
With my inadequate French I have tried to find a reference to this in this or related Diatrypaceae in Rappaz, but I have perhaps missed the obvious. If this is a well-known phenomenon I apologise for wasting people's time - have others noticed this?

Cordialement
Chris
Paul Cannon, 31-12-2014 15:00
Re : Cryptosphaeria question
No easy answers, but I noted that Laessoe & Spooner (Kew Bull. 49: 56, 1993) remarked that "The present illustration of C. eunomia (Fig. 5E in their paper) shows two distinct spore types. Although this may be an abnormal situation in the species, it clearly demonstrates its ability to produce such spores".

So it seems that the species is fairly undisciplined in its spore production. I've not seen samples like you illustrate and I'm not aware of any previous reports of gelatinous sheaths. It's tempting to dismiss such events as artefacts, but it would be interesting to recollect from the same site in the spring to establish whether this is a constant phenomenon or something caused by environmental factors such as frost.
Martin Bemmann, 31-12-2014 22:47
Martin Bemmann
Re : Cryptosphaeria question
Dear Chris,

consider these are mature spores in a documentation of Enrique:
http://www.asturnatura.com/fotografia/setas-hongos/cryptosphaeria-eunomia-var-fraxini-richon-rappaz-2/12619.html
www.asturnatura.com/fotografia/setas-hongos/cryptosphaeria-eunomia-var-fraxini-richon-rappaz-2/12619.html
and here some of C. exornata etc.:
http://www.mapress.com/phytotaxa/content/2014/f/p00186p270f.pdf
In both cases I would tend to see a gelatinous sheath around the spores that maybe is in the state of development with unmature spores in your case.

Regards
Martin
Chris Yeates, 11-01-2015 21:32
Chris Yeates
Re : Cryptosphaeria question
Perhaps this phenomenon is common to many 'pyrenomycetes'. I noticed this while examining developing Melanconis stilbostoma asci.

Chris
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