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very strange Diaporthales on Ulmus
Björn Wergen,
10-12-2012 20:33
Hello everybody,unfortunately I have another strange pyrenomycete growing on dead attached Ulmus twigs, of which I do not know what it can be. I have seen similarities to Anisogramma, Mamiania and Apioporthe, but there is no species which fits with this one here:
The fruitbodies grow between the surface of the wood and the bark, they consist of a stroma with hairy surface which is somewhat flattened, and several perithecia inside. Macroscopically it reminds me on some Splanchnonema or even Pseudomassaria.
Sp 14-17x5-7µm, clearly apiosporous, hyalin, smooth, I have seen a rest of a hyaline sheath surrounding the spores. Asci with distinct apical apparatus (Congo), IKI-; Sp mostly uniseriate, sometimes partly biseriate.
Any idea?
regards,
björn
David Malloch,
10-12-2012 20:52
Re : very strange Diaporthales on Ulmus
Hi Björn,
This reminds me of a species of Melanconis. Melanoconis chrysostroma has similar ascospores but grows on Carpinus spp. Does it produce conidia?
Dave
This reminds me of a species of Melanconis. Melanoconis chrysostroma has similar ascospores but grows on Carpinus spp. Does it produce conidia?
Dave
Björn Wergen,
10-12-2012 21:02
Re : very strange Diaporthales on Ulmus
Hi David,
I haven't seen any conidia, and I do not believe that it is a Melanconis. I have compared the finding with several species of Melanconis, but it has very different features.
regards,
björn
I haven't seen any conidia, and I do not believe that it is a Melanconis. I have compared the finding with several species of Melanconis, but it has very different features.
regards,
björn
Björn Wergen,
10-12-2012 21:37
Re : very strange Diaporthales on Ulmus
I have found some mature fruitbodies, which have very dark perithecia and stroma. Spores are apiosporous anyway...
Björn Wergen,
10-12-2012 22:17
Re : very strange Diaporthales on Ulmus
After looking for some further perithecia, I have found this conidial state from which I think it belongs to the Diaporthales sp ;)
Conidia are 8-9x2,4-3,2µm, aseptated, hyaline.
I have also attached a new cross section of a fb.
Conidia are 8-9x2,4-3,2µm, aseptated, hyaline.
I have also attached a new cross section of a fb.
Björn Nordén,
10-12-2012 22:54
Re : very strange Diaporthales on Ulmus
Hi Björn,
Seems to me too that Anisogramma may be reasonable, but no idea for a species... Nice finding
Alain GARDIENNET,
10-12-2012 23:36
Re : very strange Diaporthales on Ulmus
Hi BJörn,
I think that your species is very closed to Apiospora apiospora. But...
It's an american species growing on Ulmus and Wehmeyer gave : 11-14 x 2.5-5.5 µm, and Ellis & Everhart gave for the basionym Diaporthe apiospora : 11-15 x 6-10 µm.
Perhaps is it an european Apioporthe apiospora ?
Alain
I think that your species is very closed to Apiospora apiospora. But...
It's an american species growing on Ulmus and Wehmeyer gave : 11-14 x 2.5-5.5 µm, and Ellis & Everhart gave for the basionym Diaporthe apiospora : 11-15 x 6-10 µm.
Perhaps is it an european Apioporthe apiospora ?
Alain
Björn Wergen,
11-12-2012 01:08
Re : very strange Diaporthales on Ulmus
Hi Alain,
I think Apioporthe apiospora comes closest. The description giving by Wehmeyer has similarities with my finding, except the spore size. But I think it is A. apiospora.
Perhaps there is another idea. I recently find another species on these Ulmus twigs: Eutypella stellulata.
Many thanks to all who have written here until now :)
regards,
björn
I think Apioporthe apiospora comes closest. The description giving by Wehmeyer has similarities with my finding, except the spore size. But I think it is A. apiospora.
Perhaps there is another idea. I recently find another species on these Ulmus twigs: Eutypella stellulata.
Many thanks to all who have written here until now :)
regards,
björn
Alain GARDIENNET,
11-12-2012 07:34
Re : very strange Diaporthales on Ulmus
I agree with you. In Ellis & Ev. the width is like your one. But as I said, perhaps we can find some little differences between the two continents. Molecular study or culture perhaps would bring the answer to the question.
Eutypella stellulata is a common species in the Old Continent, ouf ! (ouf != ah ! = Ach !)
Alain
Björn Wergen,
11-12-2012 11:14
Re : very strange Diaporthales on Ulmus
Merci Alain:)
but E. stellulata is a new species for me, even if it seems to be common :P ouf ^^
Who is willing to have the Apioporthe for molecular studies?
but E. stellulata is a new species for me, even if it seems to be common :P ouf ^^
Who is willing to have the Apioporthe for molecular studies?
Christian Lechat,
11-12-2012 17:23
Re : very strange Diaporthales on Ulmus
Hi Björn,
if you want you can send your specimen to me, I will try to obtain molecular data
Christian
if you want you can send your specimen to me, I will try to obtain molecular data
Christian
Björn Wergen,
12-12-2012 10:52
Re : very strange Diaporthales on Ulmus
Hi all,
I have to thank Walter Jaklitsch, he has the idea of Melanconiella, which has aberrated spores due to the cold weather.
I am now also sure the substrate is not Ulmus, I have compared the twigs and there had been several from Carpinus, which we had collected per random. At least this was not a professional work, but we have gained a new very interesting species :)
regards,
björn
I have to thank Walter Jaklitsch, he has the idea of Melanconiella, which has aberrated spores due to the cold weather.
I am now also sure the substrate is not Ulmus, I have compared the twigs and there had been several from Carpinus, which we had collected per random. At least this was not a professional work, but we have gained a new very interesting species :)
regards,
björn