Observation 198408: Nectria sensu lato

When: 2015-02-04

Collection location: Creve Coeur Park, Maryland Heights, Missouri, USA [Click for map]

Who: Judi T. (AvidAmateur)

Specimen available

1-1.5mm specimens fruiting on a decayed log.


Copyright © 2015 jathomas
Copyright © 2015 jathomas
Copyright © 2015 jathomas
Perithecia and (#4607) raised papillae on surface stroma
Copyright © 2015 jathomas
Perithecia and (#4607) raised papillae on surface stroma
Copyright © 2015 jathomas
Macro through 10X hand lens.
Copyright © 2015 jathomas
Macro through 10X hand lens.
Copyright © 2015 jathomas
?? Black necks of the perithecia??

Proposed Names

-63% (4)
Used references: www.first-nature.com/fungus
85% (1)
Recognized by sight

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
that’s what the sensu lato is for.
By: Danny Newman (myxomop)
2017-11-11 04:55:00 CST (+0800)

to refer to all nectriaceous things that may now live inside other, potentially only distantly related genera

Hi Danny. Did you see the response from Dr.
By: Judi T. (AvidAmateur)
2017-11-11 00:39:53 CST (+0800)

Chaverri (the Nectria expert you referred me to) in the Comments section? She seemed pretty certain this was not in the Nectria genus. BTW -Thanks for all the time you spend looking at the older posts to keep them accurate and up to date.

Thank you, Dr. Chaverri. I guess …
By: Judi T. (AvidAmateur)
2015-04-13 22:42:36 CST (+0800)

there will have to be a microscope in my future if my knowledge of this genus is to expand further. I’m indebted to you for taking time to look at my observation and for sharing your insight and expertise with me.

Need microscopic observations
By: Priscila Chaverri (pxc215)
2015-04-13 21:31:32 CST (+0800)

Yes, it looks like Cryphonectria. But to confirm, it would be great to see conidia or ascospores. And by the way, Cryphonectria is not in the Nectriaceae, it is in the Diaporthales.

Thanks, for the excellent contact info, Danny.
By: Judi T. (AvidAmateur)
2015-02-12 01:07:04 CST (+0800)

I’ll definitely follow up on that. Your help is much appreciated!

Dr. Priscila Chaverri
By: Danny Newman (myxomop)
2015-02-12 00:33:48 CST (+0800)

is the foremost authority on nectriacious fungi I know of. Perhaps she will have more to offer.


Added 5 macro photos
By: Judi T. (AvidAmateur)
2015-02-11 10:42:56 CST (+0800)

as you requested, Roo. Even tried the trick taking photo through my hand lens. It was a sunny day so glare was a bit troublesome with that technique. Have many photos, but attached the ones that I thought you’d find most relevant. Hope you can see what you are looking for. I’ve never attempted to take photos of anything as small as a fraction of a mm.

Also took photos of the tree trunk and a few bark samples. It very well could be a relatively young Chestnut (diameter about 12"). For a positive identification I can take the pics and bark to an arborist at the local office of the Missouri Dept. of Conservation, perhaps next week. The tree appears to have been cut down by park maintenance and is not yet very decayed. I tried to obtain a piece of it with an ax and it was still quite sound.

Also did a bit of reading on this fungal parasite and found the article on C. parasitica in the following link to be very informative … and concise:
http://www.cabi.org/isc/datasheet/21108. I am interested to hear what you what you think after viewing the pictures. Please let me know if you need anything more. Thanks again!

By: Roo Vandegrift (Werdnus)
2015-02-11 00:07:40 CST (+0800)

Thanks Judi! Always happy to help!

Let us know when you go have gone back: I’d be interested to see some close-up shots of this one. If you don’t have a macro, try taking a picture through your hand-lens — I’ve seen that work pretty well a couple of times if the camera is very still (on a tripod or perched on something).

Look for the perithecia, and the colour of the tissue around and below them. It looks a bit under-developed in the photo, but it’s hard to tell. If it’s easy to get to, you might want to re-visit a few times to see how it develops. And any clues to the host, of course, will help narrow it down.

That link you sent, Roo, …
By: Judi T. (AvidAmateur)
2015-02-10 23:49:13 CST (+0800)

says it all. That is exactly what it looks like to me also, even the way it emerges through the bark. I almost missed it altogether, but the bright orange caught my eye as I knelt down to photograph a nearby specimen of Stereum. When I glanced over at it, the first thought that came into my mind was Nectria; but I had no luck researching from that angle. I am so grateful for all the expertise, such as yours, on MO. I learn something new almost daily since I am such a newbie mycophile.

I plan to return to the spot where I found these specimens today to have a closer look at the bark. A check in my field guide to tree bark does look as if it could be Chestnut, although the area where this was located is primarily Oak, and Hickory with some Beech, Birch, and Cottonwood. Identifying decayed trees by their bark is difficult for me, if not impossible.

Thank you both, Roo and Elsa, for taking time to look at my observation and especially for your willingness to ponder this identification. Your eagle-eyes inspire me.

By: Roo Vandegrift (Werdnus)
2015-02-10 12:15:10 CST (+0800)

Excuse the double post, please. I wasn’t even going to propose the name, but then I realized that I get notifications when people suggest names in the Xylariaceae, and I thought that proposing the name might get this in front of eyes that might know better than me. I’ve only ever seen Cryphonectria parasitica on American chestnut, but I know there are a lot of other species out there. I’m no expert on the Nectriaceae, so someone who is, please set me straight! But this is what the one I’ve seen looked like: http://www.ksuturf.org/...

Anyone have a copy of this book?
Gryzenhout, M., Wingfield, B. D., & Wingfield, M. J. (2009). Taxonomy, phylogeny, and ecology of bark-inhabiting and tree-pathogenic fungi in the Cryphonectriaceae. American Phytopathological Society.

How decayed?
By: Roo Vandegrift (Werdnus)
2015-02-10 11:56:22 CST (+0800)

Any chance it was a recently dead chestnut? That looks for all the world like Cryphonectria, the chestnut blight.

Walt, thanks a lotta lotta=)
By: Judi T. (AvidAmateur)
2015-02-10 11:56:05 CST (+0800)

Created: 2015-02-10 08:22:42 CST (+0800)
Last modified: 2017-11-11 04:56:07 CST (+0800)
Viewed: 233 times, last viewed: 2018-01-03 11:05:52 CST (+0800)
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