Observation 114861: Leccinum ponderosum A.H. Sm., Thiers & Watling

When: 2012-10-28

Collection location: Beachside State Park, Lincoln Co., Oregon, USA [Click for map]

Who: Christian (Christian Schwarz)

Specimen available

I would guess it’s L. manzanitae, but there was no madrone or manzanita around, just spruce, shore pine, and salal (the presumable host).

Proposed Names

26% (1)
Used references: California Mushrooms, North American Boletes, original description of L. ponderosum
6% (2)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Christian (Christian Schwarz)
2012-11-11 21:39:02 CST (-0600)

I looked around for other potential ericaceous hosts, but the only other one I saw was Red Huckleberry.

Complete with a nice bearberry photo, Noah. Thanks!
By: Daniel B. Wheeler (Tuberale)
2012-11-11 16:39:34 CST (-0600)

Just looked through MO’s Leccinum manzanitae obs. and noted almost all of them are from CA. Many also have ruby or reddish toning to them. At least one has a curious blue-green staining near the base of the stipe and along the stipe. (Kind of wonder about that obs.)

Arctostaphylos uva-ursi, aka bearberry and kinnikinnick, is a common ground cover especially in more northern climates, and is circumpolar. Very common in Alaska, British Columbia, Washington, Oregon, and at least parts of California.

Christian: do you remember seeing this low-growing plant near your obs.?

This is
By: Noah Siegel (Noah)
2012-11-11 11:44:32 CST (-0600)

Leccinum largentii from type location.

Having seen this mushroom a handful of times now, I think it’s the same as L. manzanitae

I just checked MO for other obs. of L. ponderosum and L. largentii:
By: Daniel B. Wheeler (Tuberale)
2012-11-11 10:05:42 CST (-0600)

the color of this obs. is not close to either one. L. ponderosum seems to be mostly tones of olive or olivaceous; L. largentii seems mostly brown but may have some olive mixed in, at least to my eye. There is a single obs. of L. ponderosum from B.C. which has pinkish casts to it, but nothing with the dark red of this obs.

In my area Leccinum is something of a rare curiousity. I typically find it with birch at lower elevations in Portland; or with true fir at elevations near 4,000 feet in the Cascades in especially steep and rocky areas.

Is the color of this obs. atypical for Leccinum?

By: Richard Bishop (Leciman)
2012-11-10 22:04:33 CST (-0600)

Thanks Darvin, I appreciate the information.

Toyon is wrong
By: Darvin DeShazer (darv)
2012-11-10 20:59:21 CST (-0600)

There was no Toyon at the holotype site. I have been there many times. Zero Toyon grows in the sand dunes along the coast near Eureka. That plant was misidentified. L. largentii grows with bearberry and lodgepole pine, the sand dune variety, Pinus contorta var. contorta.

Thought I knew most plants
By: Daniel B. Wheeler (Tuberale)
2012-11-10 13:05:19 CST (-0600)

but had to look up Toyon. Range seems to be San Francisco southward into Baja, CA. But I have seen it in Oregon as well. I don’t think most people would recognize it here. It usually is added as a formal oranmental shrub in the Portland area at least. I have a neighbor who has a planting of it, as well as at Adventist Hospital in SE Portland. There are certainly similarities between Toyon and manzanita.

Pores color and mycorrhizal associate not as described by Thiers
By: Richard Bishop (Leciman)
2012-11-10 01:04:17 CST (-0600)

According to Thiers the pore color for L. largentii and L. manzanitae is some shade of olive (smoke to dark olivacious or pale olive to olive drab. The mycorrhizal associate for L. largentii is said to be Toyon which I don’t believe occurs where this Leccinum was collected.

Leccinum manzanitae with Bearberry on the Oregon Coast
By: Richard Bishop (Leciman)
2012-11-09 17:08:20 CST (-0600)

I have found what I believe is L. manzanitae on the north Oregon coast when the only manzanitae relative in the area seems to be Bearberry. So in that regard at least I agree with Dan.

In sandy areas,
By: Daniel B. Wheeler (Tuberale)
2012-10-30 16:07:19 CDT (-0500)

host could be over 150 feet away. Something about sand dunes and sand compaction allows mycelium to grow between grains to longer distances. Looking at pictures of Beachside, there does appear to be manzanita, alder, California laurel, and a few other hardwoods mixed in. At Cape Lookout State Park and just south of there, L. manzanitae is common with manzanita and scotchbroom colonizing sand dune areas. I don’t think I would rule out Bearberry (Arctostaphyllos) as a possible host for this as well. It is a common low-growing ground cover on Oregon coastal sandy soils, too.

Created: 2012-10-29 20:24:41 CDT (-0500)
Last modified: 2012-11-10 01:05:56 CST (-0600)
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