Observation 172309: Ganoderma sessile Murrill

When: 2013-08-03

Collection location: Rock Bridge State Park, Columbia, Missouri, USA [Click for map]

Who: Patrick Harvey (pg_harvey)

No specimen available

Proposed Names

45% (2)
Recognized by sight
50% (3)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Look alikes
By: Erlon (Herbert Baker)
2015-03-18 12:26:01 CDT (-0400)

G. curtisii and G. tsugae are the closest currently known lookalikes in the eastern united states for G. lucidum. A microscope is not required to separate them. There may be other species in this complex in the east but there is nothing to support that idea currently. A cross-section of the context also provides important information for delineation.

Microscope not available
By: Patrick Harvey (pg_harvey)
2015-03-18 10:42:20 CDT (-0400)

Which species of the Ganoderma lucidum group (those which are similar macroscopically) occur in the midwestern United States? The great majority of observers on this site (perhaps 99 percent) do not post micrographs.

Are there some CURRENTLY recognized alternative names?

Microscopy as well.
By: Matthew Schink (MSchink)
2015-03-17 16:11:14 CDT (-0400)

If you have access to a microscope G.sessile and G.curtisii are very easy to distinguish, the spores are different, G.sessile will have “smooth” resinaceum type spores, and G.curtisii will have “rough” or semi rough tsugae type spores.

Also the cells in the pileipellis, G.sessile will have primarily cells that resemble a baseball bat, with a few clavate elements thrown in.G.curtisii has mostly clavate cells, looking like a club with a rounded head.You can view these cells by gently slicing at the red skin with a sharp razor blade and letting the dust fall onto a slide, then mount in isopropyl.

G.sessile matches Adaskaveg and Gilbertsons’ concept of G.lucidum. They were mistaken in concluding the synonymy of G.resinaceum and G.lucidum.Both are distinct European species occurring on hardwood. They are also mistaken in splitting Ganoderma into a hardwood group and a softwood group.

G.curtisii is considered by some to be synonymous with G.lucidum, but it is quite distinctly separated by molecular and morphological evidence.

Hi Patrick
By: Erlon (Herbert Baker)
2015-03-17 14:06:58 CDT (-0400)

G. lucidum sensu stricto does not occur in north America.

Another option for eastern hardwood is G. curtisii, its colors are lighter, from whitish, yellowish, to reddish-brown and include violet tones as it ages, rather than the more consistent reddish-brown of G. sessile. G. sessile can be differentiated morphologically by its dimidiate, sessile, imbricate, connate; and sometimes stipitate growth pattern when it is found at the root zone. The pileus is generally much more rugose than G. curtisii.

There are further differences, but that is an easy way to tell them apart.

Herbert Baker, which features in the photo lead you to this diagnosis?
By: Patrick Harvey (pg_harvey)
2015-03-17 10:02:05 CDT (-0400)

How is Ganoderma sessile differentiated from G. lucidum?

By: Patrick Harvey (pg_harvey)
2014-08-10 15:44:14 CDT (-0400)

On specimen table — but that area is primarily hardwoods.

By: Danny Newman (myxomop)
2014-08-10 15:37:59 CDT (-0400)

Created: 2014-08-03 12:19:09 CDT (-0400)
Last modified: 2015-03-17 10:02:39 CDT (-0400)
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