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Coniochaeta confusion
Chris Yeates,
26-04-2013 17:34
Bonjour tousI recently collected a decorticated narrow branch (Salix?/Betula?) well covered with a gregarious pyrenomycete; microscopical examination showed it to be a Coniochaeta. It is in excellent sporulating condition; and yet the spore measurements are confusing and do not sit well with any descriptions I have looked at, including the table in Coniochaeta extramundana, with a Synopsis of Other Coniochaeta Species D. P. Mahoney and J. S. LaFavre in Mycologia, Vol. 73, No. 5, pp. 931-952.
The ascospore measurements are (8.6)9.3-11.5 x (5.3)5.5-5.9(6.3)µm; the spores are generally similarly shaped, ellipsoid and not distinctly flattened, with the Q ratio a steady 1.6-1.7 (mostly the latter). The perithecial hairs are relatively short, the longest seen being around 30µm.
Perhaps the closest match is Coniochaeta subcorticalis, but while I am reasonably au fait with coprophilous Coniochaeta, I have little experience of lignicolous species.
Any suggestions would be much appreciated
Cordialement
Chris
Jacques Fournier,
26-04-2013 17:58
Re : Coniochaeta confusion
Hi Chris,
Coniochaeta is a genus apparently poorly known, with the most common species being Coniochaeta sp. As you seem to have wide access to literature I suggest you to read a paper by Bita Asgari1, Rasoul Zare1* and Walter Gams2 ?in Nova Hedwigia 84: 175-187 Coniochaeta ershadii, a new species from Iran, and a key to well-documented Coniochaeta species. 2007. They provided a good updated key in which you may find a lead.? The structure of the peridium is also a character to take into account, let alone the anamorph.
Best of luck!
Jacques
Coniochaeta is a genus apparently poorly known, with the most common species being Coniochaeta sp. As you seem to have wide access to literature I suggest you to read a paper by Bita Asgari1, Rasoul Zare1* and Walter Gams2 ?in Nova Hedwigia 84: 175-187 Coniochaeta ershadii, a new species from Iran, and a key to well-documented Coniochaeta species. 2007. They provided a good updated key in which you may find a lead.? The structure of the peridium is also a character to take into account, let alone the anamorph.
Best of luck!
Jacques
Chris Yeates,
26-04-2013 22:03
Re : Coniochaeta confusion
Many thanks Jacques for drawing that to my attention, and for pointing out that Coniochaeta is yet another genus which is currently not well understood - I don't feel quite so foolish now . . .
Working through the key in Nova Hedwigia 84, I arrive at the very end - with the species that matches most closely: Coniochaeta myricariae. As this is a species originally recorded on dry branches of a member of the tamarisk family and my finding was in a wet Salix/Betula wood, and as it has never been recorded in the UK before I shall file this away (definitely provisionally!) as Coniochaeta cf. myricariae - at least I have plenty of voucher material!
merci encore pour ton aide
Chris
Working through the key in Nova Hedwigia 84, I arrive at the very end - with the species that matches most closely: Coniochaeta myricariae. As this is a species originally recorded on dry branches of a member of the tamarisk family and my finding was in a wet Salix/Betula wood, and as it has never been recorded in the UK before I shall file this away (definitely provisionally!) as Coniochaeta cf. myricariae - at least I have plenty of voucher material!
merci encore pour ton aide
Chris
Björn Wergen,
27-04-2013 00:07
Re : Coniochaeta confusion
Hi Chris,
just one question: Can you send me the article about Coniochaeta?
regards,
björn
just one question: Can you send me the article about Coniochaeta?
regards,
björn
Chris Yeates,
27-04-2013 01:35
Re : Coniochaeta confusion
@Björn - which one? (and there was me thinking you could solve my taxonomic problem ;-) )
Chris
Chris