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29-11-2024 21:47

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Coelomycete on the Ulmus branches

Alex Akulov, 03-12-2011 17:39

Alex Akulov

Dear Friends
Did you know the species of coelomycete, photos of which are presented below?
Personally, I have no idea what it is. Spores are very abundant and formed on the thin dead twigs of Ulmus still attached to the tree.

Grateful before,
Alex

Martin Bemmann, 03-12-2011 22:05

Martin Bemmann

Re : Coelomycete on the Ulmus branches

Hi Alex and René,,

a close relative seems to be the Genus Coryneum. C. compactum is reported by Sutton (1980: 352) from Ulmus bark, though the conidia there are shorter as well.

Best regards,

Martin

Alex Akulov, 03-12-2011 23:20

Alex Akulov

Re : Coelomycete on the Ulmus branches

Dear Friends

Thank you for advise very much!

I was thinking about species, about which you wrote me.
I think it's something else. What do you think about Exosporium ulmi Erikss., Mykol. Zentbl. 1: 35 (1912)?

Please look at the description of this species in the attached file. Size of spores corresponds quate good, the septation character - in some extent. Unfortunately, I do not have the opportunity to find the original article, where this species has been described. It is possible, more in detail description and iconotype is present there.

Alex

P.S.
Below I send also the description of Coryneum compactum and Seimatosporium macrospermum which I have.

Alex Akulov, 03-12-2011 23:22

Alex Akulov

Re : Coelomycete on the Ulmus branches

Coryneum compactum and related species descriptions from Sutton, 1975

Alex Akulov, 03-12-2011 23:23

Alex Akulov

Re : Coelomycete on the Ulmus branches

Seimatosporium macrospermum description from Sutton, 1980

Alex Akulov, 03-12-2011 23:38

Alex Akulov

Re : Coelomycete on the Ulmus branches

Yes!
I'm pretty sure I know this species!
What do you think about Stigmina pulvinata (Kunze) MB Ellis (= Coryneum pulvinatum Kunze)? Below I attach a description and illustration of this species from Ellis, 1976. In my opinion it fits wonderfully :-)

Alex

Martin Bemmann, 03-12-2011 23:44

Martin Bemmann

Re : Coelomycete on the Ulmus branches

Yes Alex, this looks promising! The tendency of the conidia to septate muriformously is clearly to be seen in your micros. The amplitude of their length fits as well.

Regards

Martin

Alex Akulov, 04-12-2011 00:17

Alex Akulov

Re : Coelomycete on the Ulmus branches

Thank you, Martin
If I understood correctly, in 1975 Sutton noted that Stigmina pulvinata is doubtful species. A single studied sample of this species (France, vicinities of Paris, 1840) collected from Ulmus really was Stigmina compacta (= Coryneum compactum). My sample is true Stigmina pulvinata sensu Ellis (which is now considered to be the species-artifact)!

I'm at a loss, what I need to do with this find, to bring the work to the end. Coryneum is not "my" group of fungi and I had no intention of working with her deeply. And at the same time, losing this data would be unforgivable.

Alex