Observation 202120: Ganoderma lobatum (Schwein.) G.F. Atk.

4-5 conks deep inside large cavity in very decayed tree. Some quite a bit older than others. Barely visible from 5 feet away except for cream colored rim around the pore surface of the younger ones. For more details please see captions on individual photos.


Copyright © 2015 Judi Thomas
Copyright © 2015 Judi Thomas
Copyright © 2015 Judi Thomas
Copyright © 2015 Judi Thomas
Wrtie-able pore surface with 5 pores per mm. Pore surface does NOT have sterile margin.
Copyright © 2015 Judi Thomas
Mycelium and crusty deposits visible on top of one that I removed from roof of tree cavity.
Copyright © 2015 Judi Thomas
Older pore surface atop the newer one gives a stacked appearance..
Copyright © 2015 Judi Thomas

Proposed Names

26% (2)
Recognized by sight
79% (4)
Eye3 Eyes3
Recognized by sight: Annual. Context chest-nut colored.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Once again, Matt, I am indebted to you for
By: Judi T. (AvidAmateur)
2015-04-15 22:38:07 CEST (+0200)

taking the time to educate me. May I take just one more minute of your valuable time to see if I understood you correctly? Are you saying that: 1) No DNA sequencing has been done yet to clarify whether G. megaloma and/or G. lobatum are the same as the European G. applanatum, a variant, or an altogether different species? 2) If that’s true, then for the time being (until studies are completed), specimens we find in N.A. (like this observation) that have black streaks in the context are currently being called Ganoderma lobatum, and those lacking the streaked context and which have a sterile rim around the pore surface (which has much tinier pores) are referred to as G. megaloma? Or have I got it all backwards?

By: Matthew Schink (MSchink)
2015-04-15 19:39:35 CEST (+0200)

Most if not all Ganoderma bruise brown on the underside, some darker than others and make better drawing surfaces. Ganoderma applanatum is a valid name in Europe, where it was described. It’s occurrence in North America is less certain.There is a name that is likely applicable to many North American specimens, G.megaloma. What seems to be one distinguishing feature is that G.applanatum of Europe seems to lack any resinous deposits within the context.Where as North American specimens of “applanatum” do, as does G.lobatum. You can see this when you cut a dried specimen in half. There will be hard shiny black streaks in the flesh. I have not seen much DNA work done on any of these species and the sequences are scarce on Genbank. I will probably get some of my specimens sequenced at some point, but I have been more interested in the laccate species.

Matt, many thanks for all your extensive work on this ID.
By: Judi T. (AvidAmateur)
2015-04-15 17:22:51 CEST (+0200)

It is great to have a definitive species for this observation. Your initial ID — just from the pictures I posted — was right on, as was Herbert’s. Now I am left wondering if this name replaces G. applanatum or if this is another so-called “Artist’s Conk” with a writable pore surface?

Spores and more thorough exam.
By: Matthew Schink (MSchink)
2015-04-15 05:48:03 CEST (+0200)

8.5 [9.5 ; 10.3] 11.3 × 5.2 [5.8 ; 6.4] 7 µm
Q = 1.3 [1.5 ; 1.7] 2 ; N = 13 ; C = 95%
Me = 9.9 × 6.1 µm ; Qe = 1.6

11.27x 6.03
9.61 x6.30
8.57 x6.20
9.88 x6.28
9.33 x5.57
10.04 x6.79
10.23 x6.57
9.66 x6.46
9.74 x4.99
11.25 x5.60
9.73 x6.33
9.86 x5.97
9.61 x6.21

Spores about 1µm smaller on average than Gilbertson and Ryvarden’s measurments for G.lobatum.But match Steyaert’s (1980) measurements. Hyphal system trimitic, Skeletal hyphae seem predominant. Pores are 4-5 per mm thick dissepiments. Pore surface grey, turning yellow then brownish near the margin. No sterile margin seen on any specimens. Pileus is a dark brown, similar in color and tone to cast iron. The rust brown is from a deposition of spores.

This observation matches G.lobatum without a doubt, thank you for sending this material to me.

Thanks for all that good information, Matt.
By: Judi T. (AvidAmateur)
2015-04-15 00:15:27 CEST (+0200)

Every bit of information I can learn to help me ID the various conks that I find will most helpful in the future. I’m going to go try the fingernail test right now on one small specimen I still have. I look forward to the results of your microscopic analysis.

I have not done the microscopy yet.
By: Matthew Schink (MSchink)
2015-04-14 22:17:23 CEST (+0200)

The specimens that were sent me fit the description of G.lobatum. The pileus surface is a thin crust easily cracked or crushed with a fingernail. Specimens are perennial, and one shows a new fruitbody forming directly underneath last years fruit, a trait indicative of G.lobatum.

I will get to the scope at some point and post the spore values.

Thanks, Herbert.
By: Judi T. (AvidAmateur)
2015-04-08 02:50:10 CEST (+0200)

Matt suggested the same species and has offered to do microscopy on the specimens which I will have in the mail to him this week. Hopefully, that will confirm you both are correct. I’m always happy to pin down these conks so I don’t have to just call them all Ganoderma. Thanks to you both for looking at my observation and for offering your expert opinions.

Thanks so much, Matt.
By: Judi T. (AvidAmateur)
2015-04-08 00:36:20 CEST (+0200)

I’ll get specimens from both observations into the mail to you this week. I appreciate your interest and am looking forward to the results of your microscopy.

If you are asking about photo # 5702,
By: Judi T. (AvidAmateur)
2015-04-01 18:38:17 CEST (+0200)

the top, older fruiting body is very hard, dry and crusty. It is not pliable when I press on it. I would be happy to send you that conk and a few others retrieved from the same cavity in the tree. Please let me know where to send the specimens and any special instructions you may have for how you want me to package them. If you prefer, you can send that information to my private email.

On another note, early this morning I revisited that same tree to see if I could determine its species. In examining the bark on the side opposite the cavity, I discovered several small conks growing under the peeling bark. They are definitely not the same species. The pore surface looks different than anything I have seen (in my admittedly limited experience)on a conk before. I will post that observation later today, and would really appreciate it if you would take a look at it. Perhaps you can give me some direction for accurately identifying it. I am fascinated by these polypores but find getting precise ID’s — especially to species — to be challenging and would love to learn more. Thanks again for looking at my observation.

By: Matthew Schink (MSchink)
2015-04-01 05:36:55 CEST (+0200)

I would be interested in getting a sample of this observation if you would be so willing.

The old fruiting body above the newer one instead of one continuous fruiting body is one feature of Ganoderma lobatum. Is the surface in any way compressible?

Yes, there was a brown spore dust or powder
By: Judi T. (AvidAmateur)
2015-04-01 04:23:40 CEST (+0200)

all over the conks inside the tree cavity. I’ll attach one additional photo (not well focused)of another smaller (7 cm. across) one of the conks showing the context and tubes in cross section. Tube length = 9-10 mm. Hope this helps. Thanks for taking a look at my observation.

Is the brown on top from spores?
By: Matthew Schink (MSchink)
2015-04-01 03:06:43 CEST (+0200)


Created: 2015-04-01 02:23:39 CEST (+0200)
Last modified: 2015-10-05 21:23:47 CEST (+0200)
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