Observation 146596: Ophiostoma novo-ulmi Brasier

When: 2013-09-27

Collection location: Palisades, Washington DC, USA [Click for map]

Who: Erin (emaehr)

No specimen available

Had a service request from a citizen about an elm in a paper alley dropping limbs (I am an urban forester for the city) and I was examining the wood on the ground, pulling back the bark and looking for galleries of the elm beetle and found them (see below)and looking on the bark side of the wood, I saw this miniscule mushroom looking growths. I looked up the pathology and the asexual reproduction of ophiostoma novo and the photo looked exactly like what I was seeing (see link: http://www.apsnet.org/...). I would love any comments if someone has experience with this.
Especially about how long this asexual stage lasts? Is this a good diagnostic feature to identify ded?

Species Lists


ophiostoma novo-ulmi4.jpg
asexual fruiting body. In center of photo. spores aggregated on a short black stalk
Ophiostoma novo-ulmi.JPG
tree from afar
Ophiostoma novo-ulmi2.JPG
Elm beetle galleries
Ophiostoma novo-ulmi3.JPG

Proposed Names

52% (1)
Eye3 Eyes3
Used references: Dutch Elm Disease Pathology

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I still have the sample
By: Erin (emaehr)
2013-10-01 05:50:08 PDT (-0700)

I still have the sample and will bring it to class; this will likely prove challenging for me to observe the spores under the microscope, but perhaps with one of our more advanced mycologists, Mike, we will prevail. I would love to genbank this sample.
Thanks for your comments.

Congrats Erin!
By: Martin Livezey (MLivezey)
2013-09-30 20:09:31 PDT (-0700)

This is the 2nd observation of this species on MO and the only one to show fruit bodies. I wish you could get better close up photos or photos through a dissecting scope. When I first saw your photo, I thought for sure it was a slime mold, but your link shows the same structures. Check this: http://www.ncbi.nlm.nih.gov/...
There are 202 sequences of this on GenBank. You won’t be the first there, but you have a great database to compare with. I am sure you will see it again in coming years. We could try to get these spores under the electron microscope if you can collect them.

Created: 2013-09-27 05:40:17 PDT (-0700)
Last modified: 2013-09-27 05:40:21 PDT (-0700)
Viewed: 32 times, last viewed: 2017-06-29 23:38:34 PDT (-0700)
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