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Hymenoscyphus fagineus question
Chris Yeates,
24-10-2012 21:19
Bonsoir tousI am finding myself in the middle of a number of Hymenoscyphus species at the minute; with regard to the attached I am fairly confident that it is H. fagineus, but I do not have access to much data relating to Hymenoscyphus rokebyensis. I (and I suspect the few British mycologists who look at these things ;) ) rely on Ellis and Ellis which has the briefest of descriptions - i.e. rokebyensis has longer stems and narrower spores, and that is about it ...
as ever comments and opinions are welcome
amitiés
Chris
Hans-Otto Baral,
24-10-2012 21:28
Re : Hymenoscyphus fagineus question
Bonsoir Chris
H. fagineus and H. rokebyensis are not closely related. Maybe they will stand in the future in two different genera. H. fagineus has turbinate apothecia with thick short stalks or even obconical ascomata, very much unlike yours. H. rokebyensis is similar frequent as fagineus, but has a thin cylindrical stalk of very variable length. The spores contain distinctly more oil and tend to be scutuloid similar to the closely related H. fructigenus.
H. fagineus has croziers, and H. fructigenus and allied species do not have.Also the excipulum is different, angularis in fagineus, prismatica in the other.
Hope this helps
Zotto
H. fagineus and H. rokebyensis are not closely related. Maybe they will stand in the future in two different genera. H. fagineus has turbinate apothecia with thick short stalks or even obconical ascomata, very much unlike yours. H. rokebyensis is similar frequent as fagineus, but has a thin cylindrical stalk of very variable length. The spores contain distinctly more oil and tend to be scutuloid similar to the closely related H. fructigenus.
H. fagineus has croziers, and H. fructigenus and allied species do not have.Also the excipulum is different, angularis in fagineus, prismatica in the other.
Hope this helps
Zotto
Chris Yeates,
24-10-2012 21:32
Re : Hymenoscyphus fagineus question
Many thanks Zotto for that - so is my fungus neither fagineus nor rokebyensis ?
best wishes
Chris
best wishes
Chris
Hans-Otto Baral,
24-10-2012 21:35
Re : Hymenoscyphus fagineus question
Well, my guess is rokebyensis, but I should see the spores much larger.
Chris Yeates,
24-10-2012 21:53
Re : Hymenoscyphus fagineus question
OK - I shall do more collecting on Fagus cupules, and get to grips with this one!
Does anyone have a PDF for either:
Hymenoscyphus rokebyensis (Svrcek) Matheis, Mitt. thürgau. naturf. Ges. 43: 157
or
Helotium rokebyense Svrcek, Ceská Mykol. 16: 113 (1962)?
one of the reasons I am interested is that 'Rokeby' is here in Yorkshire - (indeed one time home of: http://www.nationalgallery.org.uk/paintings/diego-velazquez-the-toilet-of-venus-the-rokeby-venus) - while the site is now in Durham, we record based on historic boundaries
cordialement
Chris
Does anyone have a PDF for either:
Hymenoscyphus rokebyensis (Svrcek) Matheis, Mitt. thürgau. naturf. Ges. 43: 157
or
Helotium rokebyense Svrcek, Ceská Mykol. 16: 113 (1962)?
one of the reasons I am interested is that 'Rokeby' is here in Yorkshire - (indeed one time home of: http://www.nationalgallery.org.uk/paintings/diego-velazquez-the-toilet-of-venus-the-rokeby-venus) - while the site is now in Durham, we record based on historic boundaries
cordialement
Chris
Hans-Otto Baral,
24-10-2012 22:03
Re : Hymenoscyphus fagineus question
Here you have a comparison of the spores. Note the pointed lower end in rokebyensis.
Also Velenovsky confused the two.
Zotto
Also Velenovsky confused the two.
Zotto
Chris Yeates,
24-10-2012 22:20
Re : Hymenoscyphus fagineus question
Excellent Zotto - here is a larger image of the spores of my fungus - much closer to rokebyensis I agree
Dank wie immer
Chris
Dank wie immer
Chris
Hans-Otto Baral,
24-10-2012 22:22
Re : Hymenoscyphus fagineus question
Jawohl, and you see how important the arrangement of the droplets is.