When: 2013-11-17

Collection location: Dunsmuir, California, USA [Click for map]


Who: (Aaron Cena) (mountainplayer)

No specimen available

White with blood red stains when fresh, brownish with reddish brown stains (like a russet potato) when I opened the container at home.

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I’m sure there must be.
By: Daniel B. Wheeler (Tuberale)
2013-11-21 14:50:27 CST (-0500)

Dr. Trappe and others told me of it probably 15 years ago. But I think it was under the name Thuja plicata.

There is one other tree native to the PNW which does not form mycorrhizae: Pacific yew. The taxol-bearing tree apparently does apparently host another fungus in its bark, though. I think I remember that as Taxomyces andreae. May have to look that one up as well.

non-mycorrhizal tree species????
By: else
2013-11-21 13:54:21 CST (-0500)

is there a literature source for the absence of any type of mycorrhiza in the western red cedar, Thuja plicatilis?
It is hard to imagine that it would not have AM fungi in its roots.

From the list of possible hosts for the Rhizopogon, several others do not qualify as they do not form ectomycorrhiza – giant sequoia, and pacific dogwood.

With the exception of
By: Daniel B. Wheeler (Tuberale)
2013-11-20 13:29:15 CST (-0500)

Western Red cedar (Thuja pllicata). Does not form any kind of mycorrhizae.

Incense cedar
By: else
2013-11-20 00:33:42 CST (-0500)

does NOT form ectomycorrhiza. Only species in the Pinaceae, the pine family, form ectomycorrhizas. all other conifers form associations with arbuscular mycorrhiza in the Glomeromycota.

Incence cedar
By: Daniel B. Wheeler (Tuberale)
2013-11-20 00:28:23 CST (-0500)

and all other cedars are mycorrhizal with some fungi. These fungi are often hypogeous (underground) and atypical species.

Rhizopogon rubescens does not form mycorrhizae wit Incence cedar to my knowledge.

Byrain, you are right on with your comments.
By: (Aaron Cena) (mountainplayer)
2013-11-19 13:28:53 CST (-0500)

I do, in fact, frequently use the wrong name for the cedar’s in my area.

While we do have western red cedar, they are much more scattered than the incense cedar, which is what was growing near this collection. Sugar pine is also present, although it was not visible near this collection.

My impression in hunting mushrooms in the area, for what it’s worth, is that the most common host trees are the firs.

By: Byrain
2013-11-18 17:14:04 CST (-0500)

I missed where Aaron said that. Those photos show Quercus kelloggii and he just used the wrong common name for the “cedar”, I don’t think Thuja plicata is found that far inland.

I think the only tree he missed besides the oak is the sugar pine.

Aaron Cena’s asserts there is “scattered” Western Red cedar
By: Daniel B. Wheeler (Tuberale)
2013-11-18 15:00:22 CST (-0500)

in Dunsmiur.

Quercus kelloggii (California Black oak) may be present in the Dunsmuir area. Clearly it is not present in the photos.

By: Byrain
2013-11-18 13:27:17 CST (-0500)

There are no Thuja plicata in Dunsmuir and the oak in the area is Quercus kelloggii.

The “cedar” is Calocedrus decurrens.

Last two photos
By: Daniel B. Wheeler (Tuberale)
2013-11-18 12:55:28 CST (-0500)

show oak leaves similar to Oregon White oak. The largest known Rhizopogon rubescens was found in Southern Oregon with Oregon White oak.

Western red cedar
By: Daniel B. Wheeler (Tuberale)
2013-11-18 12:53:08 CST (-0500)

does not form mycorrhizae that I am aware of. It is the one exception to the general rule that trees require mycorrhizal fungi.

Most likely hosts are White fir, Douglas fir or Ponderosa pine.
By: (Aaron Cena) (mountainplayer)
2013-11-18 12:30:30 CST (-0500)

There are also scattered western red cedar.

This is a mixed wood area, Dan.
By: (Aaron Cena) (mountainplayer)
2013-11-18 12:29:27 CST (-0500)
Mycorrhizal with?
By: Daniel B. Wheeler (Tuberale)
2013-11-18 03:02:28 CST (-0500)

What are the possible mycorrhizal hosts, i.e. what trees were present within 200 feet of where these were found? A 150-foot tall tree can host Rhizopogons 200 feet away.

Ponderosa pine?
Shasta Red fir?
Lodgepole pine?
California Black oak?
Pacific dogwood?
Giant Sequoia?
Jeffrey pine?
Gray pine?
White fir?

While Pinus is the usual host for Rhizopogon, Douglas-fir is a close second, and even oak a distant third. While you have a red staining Rhizopogon, and R. rubescens is one of the most common species, there are others. Common mycorrhizal hosts for R. rubescens would be Lodgepole pine (Pinus contorta) in sandy soils.