Observation 71643: Hypoxylon rubiginosum (Pers.) Fr.
When: 2011-05-26
No herbarium specimen

Notes: I am posting obs tonight to illustrate what I think are yellow, orange, red-orange, dull brown-orange, and black phases of what has been referred to as on MO as Hypoxylon sp. There appear to be fruiting bodies on the edges of some of these (asexual?) that some have thought of as another fungus.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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100% confirmed
By: Danny Newman (myxomop)
2016-08-08 19:27:18 CDT (-0400)

against all the macro and micro lookalikes outlined here?

By: John Plischke (John Plischke)
2012-07-06 00:19:14 CDT (-0400)
microscopy will definitely help
By: Danny Newman (myxomop)
2012-07-03 18:30:12 CDT (-0400)

i’d do a whole tooth first.

Agreed myxomop
By: Martin Livezey (MLivezey)
2012-07-03 18:08:53 CDT (-0400)

It is a complete shot in the dark and for the most part it does not agree with anything else observed in Hypoxylon. It does seem that the thread is not completely of my own imagination. Maybe some microscopy will help. The really astonishing thing to me is that this is COMMON. I know it stretches as far as Ohio from Dan Molter’s photos. Here it can be seen from February to November, but it is most common in March and April.

By: Danny Newman (myxomop)
2012-06-28 02:07:03 CDT (-0400)

reviewing the linked obs within linked obs, I think Hypoxylon might actually have a chance. how utterly strange though to start off with teeth. would be nice to see this documented at every step of the developmental process to see just how/if those spines turn into ostioles. for the moment, I’m not completely convinced, plus your references, Martin, don’t do anything to explain H. rubiginosum as having this hydnoid appearance.

I don’t think it every starts green
By: Martin Livezey (MLivezey)
2012-06-28 00:19:27 CDT (-0400)

This is always visible in the woods of Rock Creek. It starts yellow and goes to orange and red. I have seen pinkish brown in February that sends out ostioles. I believe second year is normally black – but I suspect it might also be brown if it gets well enough established before the end of the growing season. I should scope it. Here is a prior discussion on a nearly identical specimen in Ohio.


Starts off Green? etc
By: John Plischke (John Plischke)
2012-06-27 19:30:27 CDT (-0400)

I saw something may be the same. The one I have been seeing starts off green and then goes yellowish like in the above photo. I not 100 percent certain its the same but I think so. I have a collection of it that I put in my back yard to watch it and see if it contiues to change. I am ready to scope it if I come up with any ideas.

not Hypoxylon
By: Danny Newman (myxomop)
2012-06-21 01:07:49 CDT (-0400)

not with those teeth.

Created: 2011-07-15 21:10:59 CDT (-0400)
Last modified: 2016-08-08 19:32:53 CDT (-0400)
Viewed: 209 times, last viewed: 2016-10-23 12:46:10 CDT (-0400)
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