Observation 164542: Morchella brunnea M.Kuo
When: 2014-04-30

Notes: Growing in the American Fire Zone of 2013.
Spores ~ 20.0-26.0(27.0) X 14.8-16.8(18.5) microns, elliptical, smooth and without an oil droplet.
A burn morel, with spores matching Kuo’s Morchella capitata more closely than others.
Edit 5-11-2015; Checked the sterile ridges and saw primarily septate, cylindrical terminal cells and no capitate cells. That seems to eliminate M. capitata/M. exuburans. That also may indicate M. sextelata which Kuo indicates sterile cells being mostly cylindrical vs M. septimelata/M. eximia where the cells are more clavate.


Sterile ridges in Congo Red + KOH @ 400X.
Sterile ridges in Congo red + KOH @ 400X.
Sterile ridges in Congo red + KOH @ 400X.

Proposed Names

-57% (1)
Used references: Taxonomic revision of true morels in Canada and the United States by Michael Kuo et al.
8% (2)
Recognized by sight: if your morel is Kuo’s “capitata,” it is now called exuberans, the preferred name for DNA identical species.
47% (2)
Recognized by sight
61% (2)
Recognized by sight: It is my understanding that DNA analysis is needed to separate M. sextellata from M. septimelata. Phylogenetically they aren’t super close, so I think it is likely that microscopic differences will be discovered.
28% (1)
Recognized by sight
61% (2)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thanks Alan and Debbie
By: Terri Clements/Donna Fulton (pinonbistro)
2015-12-02 14:12:51 PST (-0800)

According to M. Kuo M. exuberans has chambered rather than hollow stems which would also help differentiate it from M. sextelata and M. eximia. Did the Richards etal paper invalidate that as a consistent macro character?


you are correct Terri/Donna …
By: Debbie Viess (amanitarita)
2015-12-02 12:37:40 PST (-0800)

unless they are the morpho-distinctive, elongated form of eximia found growing along creeksides!

those are apparently distinctive by habitat, altho it would be good to confirm this with DNA.

I don’t care how many papers get published on morels … telling them apart still isn’t easy!

I see that you had already determined a lack of capitate cells Ron, so at least we can eliminate exuberans.

Hi Ron,It’s my understanding that DNA analysis
By: Terri Clements/Donna Fulton (pinonbistro)
2015-12-02 08:59:32 PST (-0800)

is needed to differentiate between M. sextelata and M. eximia—see comment on obs 203724

still have this specimen?
By: Debbie Viess (amanitarita)
2015-05-09 16:47:39 PDT (-0700)

could you check for those terminal capitate cells? That is the only way to tell this sp. apart from eximia and sextelata.

And a few…
By: Christian (Christian Schwarz)
2014-05-02 10:39:51 PDT (-0700)

Geopyxis carbonaria nestled in the pine duff
in the second photo!

Created: 2014-05-02 10:19:58 PDT (-0700)
Last modified: 2016-04-25 08:21:06 PDT (-0700)
Viewed: 217 times, last viewed: 2016-10-27 23:17:48 PDT (-0700)
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