Observation 32092: Ganoderma tsugae Murrill

When: 2009-10-17

Collection location: Wilkes-Barre, Pennsylvania, USA [Click for map]

Who: Dave in NE PA

No specimen available

Found growing from the ground beneath a hedgerow in a front yard. Maybe there were buried roots from a tree that had been removed? One almost never sees hemlock trees in an urban setting (at least not around here). So I think it is not G. tsugae.

[admin – Sat Aug 14 02:07:55 +0000 2010]: Changed location name from ‘Wilkes-Barre, PA, USA’ to ‘Wilkes-Barre, Pennsylvania, USA



Proposed Names

33% (2)
Recognized by sight
45% (3)
Recognized by sight: found this myself grows on or underground from burried wood prefers oak
73% (1)
Recognized by sight: Dave: Ganoderma tsugae grows from trunks, stumps, and roots of pine trees. The Holotype for G. tsugae was collected from Tsuga canadensis by Murrill in New York City. As of today, it is also known to grow from Abies, Betula, Larix, Picea, Pinus, and Pseudotsuga… Ganoderma resinaceum rarely has a stipe. It grows sessile. Its pores are larger, measuring 2-3 in mm, they can be measured without a magnifying glass. On the other hand, Ganoderma tsugae grows sessile, and stipitate. Its pores are tightly packed 4-6 per mm. They are tiny and difficult to count using a magnifying glass & ruler. Thus, this one is best classified under Ganoderma tsugae.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thanks for the info, ndoll.
By: Dave W (Dave W)
2012-01-29 13:06:58 CST (-0600)

I see so many G. tsugae around here (presumably) growing on hemlock, that I kinda take the varnished shelves for granted. I should check the pore density and context color once in awhile, especially if I find one growing on anything but hemlock.

Identifying Ganoderma online, is tricky.
By: ndoll
2012-01-28 11:42:13 CST (-0600)

Experts generally do not attempt without the specimen in hand. Most dichotomous keys for Ganoderma begin with microscopic features in laccate crust, or the derm, its skin. Thus, it is necessary to take a non-traditional approach if online

In New England states, the common varnished Ganoderma species are: G. lucidum, G. resinaceum, and G. tsugae. These three can be recognized with some ease in the field by (1)measuring their density of pores per millimeter, and (2)determining the color of interior context.

Step one in the identification process is to Measure the Density of Pores:
G. lucidum: 3-5 per 1 mm.
G. resinaceum: 2-3 per 1 mm.
G. tsugae: 4-6 per 1mm.

Measuring pores takes practice, a magnifying glass, and a ruler. A digital photo of its surface including a ruler is a stable reference. It helps to measure up to 10 places on its pore surface. Measure pore density only where the pore surface is flat. Results can be wishy-washy if measuring on an incline, near the caps margin, and in areas that are stretched or crunched by environmental stress.

Step two is to dissect the specimen in half to Determine the Color of Interior Context:

Keep this part simple.
G. lucidum: brownish context
G. resinaceum: brownish context
G. tsugae: off-white, pale buff context

With those two steps outlined above you can determine the species of varnished Ganoderma in PA, in the field within a minutes time.

I have always associated
By: Dave W (Dave W)
2012-01-21 23:14:40 CST (-0600)

G. tsugae with hemlock (Tsuga canadensis). Although we have plenty of eastern hemlock in our forests, it is not commonly seen as an urban ornamental or shade tree. But given that tsugae associates with other types of trees, then this opens the door. I see a lot of White Birch (Betula) on lawns.

What I find interesting about this polypore is the habitat (urban, under a shrub), and the way the shiny varnished part, the pores, and the yellow top part are arranged in layers. I had thought maybe this was a trait someone would recognize… Just noticed now that Phillips does show one picture of a tsugae collection where one of the polypores shows the vertical “layering” of surface structure.


The pores are white and minute, so tsugae sounds good. But it’s possible there were old roots buried in that small front lawn. So either I don’t know the host tree or the host is the shrub.

Thanks for the input, dadvis and ndoll.

By: travasskavich (dadvis)
2010-01-18 16:54:19 CST (-0600)

Where I found this there were several around the base of on oak stump the amaller looked like yours but more yellowed from age. Appeared like the end of a bone the larger more mature were more like cow shit

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