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Helvella sp
Malcolm Greaves, 22-04-2015 17:02
Malcolm  GreavesThis Helvella was found in nettle covered soil in a heath area with mostly betula and quercus. At first sight I assumed it was H. acetabulum but under the scope the spores were according to the books I have are much too broad with an average of 22-23 x 16-17.5.
Is there another Helvella it might be?
Thanks
Mal
  • message #35364
  • message #35364
Nicolas VAN VOOREN, 22-04-2015 17:21
Nicolas VAN VOOREN
Re : Helvella sp
No problem, this is H. acetabulum. You're right, the ascospores are a bit wider than in my own collections, but acceptable for this species.
Malcolm Greaves, 22-04-2015 17:31
Malcolm  Greaves
Re : Helvella sp
Thanks Nicolas
Mal
Till Lohmeyer, 22-04-2015 18:04
Re : Helvella sp
Some people would, perhaps, suggest Helvella unicolor (Boud.) Dissing. It is a broad-spored taxon closely related to acetabulum - but to me more or less a phantom-species. I have some "cfs" in my collection but none of them has really convinced me. Does anyone know the true unicolor - or is it not accepted anymore? 

Regards, Till
Mario Filippa, 23-04-2015 23:48
Re : Helvella sp

I have measured some hundreds of spores of H. acetabulum that is a rather common species and that I see every year in hundreds of ascomata. Many times I have searched for the differences mentioned by Dissing (who examined the original material of H. unicolor in the Boudier's herbarium) as follows:


"H. unicolor can be separated from H. acetabulum and H. costifera on its very broad spores and on characters of anatomy".


The difference from H. costifera is clear, but with H. acetabulum I never understood well what can be the difference "on characters of anatomy". So I think the only chance to learn something more is to find and study carefully some very broad-spored collections of "H. acetabulum".


Malcolm's collection could be a chance to do this, as in my measurements the spores of H. acetabulum are normally 11,5-14,5 µm broad. I have never seen spores x 16-17,5. This might not be enough to recognize another taxon, but a careful investigation should be done.


Mal, was it an abundant collection or it was just one apothecium? The spore size is the same in others specimens? This is the first step.


Thank you to keep me updated with this collection.


Regards


Mario

Malcolm Greaves, 24-04-2015 11:12
Malcolm  Greaves
Re : Helvella sp
Mario
Unfortunately it was just a single specimen. I took another spore drop and although there were spores closer to the "normal" range there were more in the 16-17 area. What else could I look for or could I send this specimen to you?
Mal
  • message #35394
  • message #35394
Mario Filippa, 25-04-2015 00:59
Re : Helvella sp

Well, I don't know exactly what to search for. Maybe the best thing is to compare carefully the characters with those of a "typical" H. acetabulum. If you want to send me the specimen I would be happy to examine it. I send you my address by mail.


Thank you


Mario