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19-08-2022 22:26

Juuso Äikäs

A few years ago I found a group of olive-brown fru

19-08-2022 19:05

Stefan Jakobsson

On a petiole of a leaf of what seems to be Populus

09-08-2022 20:06

Stephen Mifsud Stephen Mifsud

I have found an interesting aspergillus on flowers

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I assumed these are weak colonies of Neurospora on

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Thomas Læssøe

https://svampe.databasen.org/observations/10283042

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Récolte le 31/07/2022 – Ozoir-la-Ferrière (77)

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Bonjour à tous, Hi to all. This tiny bright yell

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Neonectria ? on Populus nigra
Enrique Rubio, 19-07-2011 19:48
Enrique RubioHi to all:

These perithecia grow on a well developped reddish stromata  erumpent from bark of Populus nigra. KOH = purplish. The asci have an conspicuous apical apparatus.  Macroconidia are hyaline and  3-7 septate. Maybe Neonectria coccinea?
Many thanks again
Enrique
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Alex Akulov, 19-07-2011 20:57
Alex Akulov
Re : Neonectria ? on Populus nigra
Dear Enrique

Your sample is really very similar to Neonecria coccinea sensu lato. But Neonectria is very difficult genus, for which annually described lots of new species. Identification without culture and molecular analysis is not very rewarding job. Name Neonectria coccinea sensu strictu now used only for the samples which are collected from Fagus. For Neonectria coccinea-complex representatives from other substrates it is better to use the name Neonectria caespitosa (Fuckel) Wollenw.


In ARS database stated:


According to Castlebury et al. (in press), Neonectria coccinea sensu stricto is restricted to Fagus spp. in Europe. Records from Fagus in North America are referred to Nectria coccinea var. faginata, soon to be transferred to species rank in the genus Neonectria (Castlebury et al. in press).


Distribution: Reported from Europe, North America, New Zealand, Africa (Malawi). According to Castlebury et al. (in press), Neonectria coccinea sensu stricto is restricted to Fagus spp. in Europe. Records from Fagus in North America are referred to Nectria


Substrate: Hardwood trees, dung, soil.


Disease Note: No clear evidence of pathogenicity (Booth 1966).


Host: Trees of multiple plant families.


 


Alex

Jacques Fournier, 19-07-2011 20:58
Jacques Fournier
Re : Neonectria ? on Populus nigra
Hola Enrique,
I made a similar find last week on Populus tremula, but with larger ascospores 16-17 x 5µm. Neonectria coccinea is supposed to be host-specific for Fagus, thus all similar species on other hosts must be re-evaluated. Amy Rossman is working on this topic, you should send her this collection.
Everyday at the post office!
Cheers,
Jacques
Alex Akulov, 19-07-2011 21:16
Alex Akulov
Re : Neonectria ? on Populus nigra

In the attached file I send you "classical" description on Neonectria coccinea sensu lato and related anamorph from C. Booth article: The genus Cylindrocarpon // Mycological Papers, 1966, N104.


As you can see its really corresponds with your:-)


Alex

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Alex Akulov, 19-07-2011 21:36
Alex Akulov
Re : Neonectria ? on Populus nigra

E-mails of Neonectria specialists from USA:


Amy Rossman <amy@nt.ars-grin.gov>


Lisa Castelbury <castlebury@nt.ars-grin.gov>

Jacques Fournier, 19-07-2011 21:58
Jacques Fournier
Re : Neonectria ? on Populus nigra
Dear René,
to my knowledge species of Neonectria are not fungicolous but are seated on a more or less well-developed stroma erumpent from the bark.
Are you sure the macroconidia you observed were of the Cylindrocarpon type? Many fungicolous species belonging to Cosmospora s.l. have Fusarium-like anamorphs with macroconidia resembling those of Cylindrocarpon but somewhat hooked at one or both ends.
Jacques
Enrique Rubio, 20-07-2011 09:51
Enrique Rubio
Re : Neonectria ? on Populus nigra
Tank you to all for your kindly help. I will write Rossman for to know her opinion.
Enrique
Enrique Rubio, 20-07-2011 14:39
Enrique Rubio
Re : Neonectria ? on Populus nigra
This one is Amy's nice response to the question:

Dear Enrique,

This appears to be Neonectria coccinea in the broad sense.  True N.
coccinea only occurs on beech as shown in the attached paper.  We have a
student and Japanese scientist who are working on defining the non-Fagus
species of N. coccinea.  Hopefully they will be able to distinguish them
morphologically but that is not always true.  It may be necessary to grow
the Cylindrocarpon asexual state in order to identify it and even then....As you
can see they all look similar in the sexual state.


We would welcome your specimen as part of this study if you care to send
it here to the address listed below.  Also, you can see this paper that I
saw just today on this group of fungi.


All the best!


Amy