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Two Guernsey fungi

Posted: Sun Sep 03, 2017 3:57 pm
by markwilson
The first on Cyperus longus - the only suspect I can find is Puccinia romagnoliana in http://bladmineerders.nl/parasites/fung ... agnoliana/

The second is on
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Agapanthus for which I can find no suitable candidate

I have specimens but I cannot do the microscopy

Thanks

Mark
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Re: Two Guernsey fungi

Posted: Sun Sep 03, 2017 3:59 pm
by markwilson
Guernsey!!!

Mark

Re: Two Guernsey fungi

Posted: Fri Sep 08, 2017 8:50 pm
by Chris Yeates
Hi Mark
if no one else has offered I would be prepared to have a look for you, but wouldn't like to comment on what I can see here - even as to whether fungi are definitely involved. There may be one or two pycnidia on the Agapanthus and there is a Septoria agapanthi: http://www.fieldmycology.net/frdbi/FRDB ... +agapanthi but as I say microscopy is essential here.

cheers
Chris

Re: Two Guernsey fungi

Posted: Sat Sep 09, 2017 4:54 pm
by markwilson
Hi Chris

Thanks very much

I'll package up tomorrow

Regards

Mark

Re: Two Guernsey fungi

Posted: Sun Sep 10, 2017 1:38 am
by Chris Yeates
markwilson wrote:
Sat Sep 09, 2017 4:54 pm
Hi Chris

Thanks very much

I'll package up tomorrow

Regards

Mark
As long as they are lightly pressed and 100% dry - do you have my address?

best
Chris

Re: Two Guernsey fungi

Posted: Tue Sep 12, 2017 12:33 pm
by markwilson
Hi Chris - I posted them yesterday

The one on Cyperus may have dried out too much but I might be able to get another specimen - I have not been able to post extra photos - I'm having probels reducing the file size - but will sort out somehow

Regards

Mark

Re: Two Guernsey fungi

Posted: Wed Sep 20, 2017 7:32 pm
by Chris Yeates
Hi Mark
apologies for getting back somewhat tardily.

I'm afraid I can't find anything fungal on the Cyperus; however the collection on Agapanthus is far more promising. As there appear to be only three conidiomata on the collection I had to be careful - it's easy not to get a preparation right the first time with something as tiny (about 0.2mm!) as this.

Under the microscope it was immediately clear that I was dealing with a Phomopsis species. This large genus comprises anamorphs of Diaporthe (although often a perfect Diaporthe state is not known). Phomopsis is characterised by having either α-conidia which are ellipsoid with ± pointed ends and usually with two large guttules, and/or β-conidia which are linear and curved at one end ; rather rarely a third sort of conidium may be involved. Examples of α-conidia (and the third kind) can be seen here: http://www.ascofrance.com/search_recolte/4461 and α-conidia only here: http://www.ascofrance.com/search_recolte/3850 (click on thumbnails).

A literature search came up with a relatively-recently described Phomopsis on Agapanthus: http://www.fieldmycology.net/FRDBI/FRDB ... BNum=47948 (this appears to be the only record to date). I have found the original description in Kew Bulletin 60: pp.149-158 (2005). Here is the page where the species is illustrated:
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and here a couple of images from the Guernsey find:
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Although the conidial measurements of the Guernsey collection are larger than those of the Kew one I think it doubtful that there would be two separate Phomopsis species on this host in this country. So I would call this collection Phomopsis agapanthi Punith. & Spooner with the proviso that it would be desirable to have further material for examination to chec k the range of conidial size - the Guernsey material is very scant compared to that from Kew (see the illustration above). I also need to have a careful look - if I can - at the structure of the conidiophores.

best wishes
Chris