Observation 79348: Ganoderma polychromum (Copel.) Murrill

When: 2011-10-07

Collection location: Mar Vista, Los Angeles, California, USA [Click for map]

Who: Sydney (sydneyg)

No specimen available

The conk was growing at the base of several sweet gum trees. These were city trees growing on the side walk. Some were dead and one was alive.


specimen on a drying rack
spores under 100x on oil
spores under 100x on oil
growing at the base of a living sweet gum tree
growing at the base of a dead tree
the white pore layer bruised brown with age

Proposed Names

46% (2)
Recognized by sight: shelf fungus, hard, white pore surface that turned brown with age, shiny and laquered cap
Based on microscopic features: brown pitted spores
49% (1)
Recognized by sight: The spores in your photos resemble Ganoderma resinaceum. They look plumper and with thinner walls then spores of G. lucidum. And also, G. resinaceum is recorded to grow from sweetgum.
Used references: “Basidiospore form in the British species of Ganoderma Karst”.  D.N. Pegler, and T.W.K. Young.  1973. and “Study of Some Ganoderma Species”.  R.L. Steyaert.  1980.
52% (1)
Recognized by sight: Yellow band in context directly under the dermis of the mushroom. This feature seems to be a consistent distinguishing detail for Ganoderma polychromum. I have not seen it in Ganoderma resinaceum complex from the East.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
how do i do that?
By: Sydney (sydneyg)
2011-10-12 11:57:12 PDT (-0700)

I’m not sure how – the image was rotated the correct orientation when I uploaded it.

5th Image…
By: IntoTheFlames
2011-10-12 10:44:43 PDT (-0700)

Any chance you could rotate it?

Created: 2011-10-11 18:42:05 PDT (-0700)
Last modified: 2015-01-09 09:02:22 PST (-0800)
Viewed: 135 times, last viewed: 2018-08-06 15:29:30 PDT (-0700)
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