Accès membres

Mot de passe perdu? S'inscrire

01-10-2022 11:54

DirkW DirkW

chers collègues, anyone out there who could send

05-10-2022 16:09

JEAN CABALION

Bonjour, Qui peut me renseigner sur ce Podostroma

24-10-2021 21:50

Robin Isaksson Robin Isaksson

Hi,Found on Andreaea rupestris sweden.ascomata bl

29-09-2022 17:25

Juuso Äikäs

A finding from a couple days ago: a few white Hyme

29-09-2022 13:34

Marja Pennanen

Dear colleagues, a couple of days ago I found the

13-12-2014 21:47

Rubén Martínez-Gil Rubén Martínez-Gil

Hola a todos. Subo unas imágenes de un disco neg

26-09-2022 15:31

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello,please, can this be something else than Hypo

28-09-2022 22:03

Roo Vandegrift Roo Vandegrift

Hello! I wanted to share a fascinating thing I saw

25-09-2022 20:04

Elisabeth Stöckli

Bonsoir,Trouvé à 2'500 m (prairie alpin), taille

27-09-2022 19:06

Marie-Paule VIGNERON

Bonsoir. Sur crottin de cheval ramassé fin août

« < 230 231 232 233 234 > »
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
  • message #33148