Observation 63963: Suillus Gray

When: 2010-12-26

Collection location: Mission De Alcala, San Diego, California, USA [Click for map]

Who: Christian (Christian Schwarz)

No specimen available

Growing with planted pines, probably Canary Pine.


Copyright © 2011 Christian F. Schwarz
Copyright © 2011 Christian F. Schwarz

Proposed Names

58% (9)
Recognized by sight
-21% (8)
Recognized by sight: viscid cap with pale, inrolled margin, pale pores changing to yellow and browning slightly, glandular dots on uniform stipe.
Used references: “North American Boletes” by Bessette, Roody and Bessette.
“California Mushrooms: A Field Guide to the Boletes” by Harry Thiers.
-11% (5)
Recognized by sight: The cottony white veil tissue on the cap margin, and the dense glandular dots on the stipe.
44% (3)
Recognized by sight: as illustrated in Funghi d’Italia Vol. 2, Consiglion and Pappeti 2001

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

= Observer’s choice
= Current consensus


Add Comment
Okay so you guys say it is introduced right?
By: Gerhard Koller (Gerhard)
2011-06-28 05:35:47 CDT (-0400)

If this is the case it perhaps could really be Suillus bellinii the assemblance is really striking. But then again the cap is very dark and lacks this typical stripy-streaky pattern. There has been described a new species from Mauritius recently so the case isn’t that easy. You should watch this place for more specimens and document everything very well.

By: Christian (Christian Schwarz)
2011-03-14 20:35:34 CST (-0500)

I don’t know who posted that video, but what they are collecting looks more like what was illustrated as S. mediterranensis – less pink on the stipe, more yellow in cap. The context in the video is also very yellow, this was more whitish to pale yellow.

Regardless, I think the published book is probably more trustworthy, and the photo there looked strikingly like this collection.

maybe so, Christian…
By: Debbie Viess (amanitarita)
2011-03-14 16:57:34 CST (-0500)

Here’s a You-Tube movie of S. bellinii collected in Europe, with a morphological description:

Although the cap color in the movie isn’t a perfect fit, that’s a variable feature. The milky pink droplets do fit your mushroom. What did your mushroom context look like?

And another description on Wikipedia, that also fits pretty well, with a viscid brown cap, edged in white and inrolled:


Interestingly enough, it is a relative of granulatus and can be confused with that species! Go figure…;)

I agree Irene.
By: Debbie Viess (amanitarita)
2011-03-02 11:03:56 CST (-0500)

This mushroom may well be Suillus granulatus as described by Thiers here in CA, but does not appear to be the European granulatus.

I will change the name to reflect that.

By: Irene Andersson (irenea)
2011-03-02 04:05:49 CST (-0500)

My idea is that what you find in California, is more likely to be a species described from that area, rather than a european one. If this is what you call granulatus, it is not the same species.
And even if it is a species that has been introduced with Canary Pine, it’s still more likely to have been described from California, where that subtropical tree is locally naturalized, than from Europe.

It doesn’t look like granulatus, with those pink/vinaceous staining droplets creating an areolate pattern on both stem and tubes.
Some representative photos of Suillus granulatus can be seen here:

European species vs American species
By: else
2011-03-01 20:54:27 CST (-0500)

European S. granulatus does not (naturally) occur in North America, though the name S. granulatus is used for an North American species. Whether it is introduced is an open question.
Suillus species do not show much host specificity when brought into a new environment – European S. luteus is widespread in the southern hemisphere growing with Pinus radiata, a California native.
Similarly, there are different Suillus species on both sides of the Rocky Mountains in North America, species that look very similar, but do have different DNA signatures.

could we have different, similar Suillus species in Europe/the East Coast vs CA?
By: Debbie Viess (amanitarita)
2011-03-01 20:32:15 CST (-0500)

hence some of the confusion between folks on this ID?

Maybe we’re not so far apart here, Irene…in the Bessettes book, granulatus is listed as a lookalike for punctatipes (and vice versa), the differences being that punctatipes has a darker cap and boletinoid pores (elongated pores laid out in a radial design from the center of the cap).

the milky droplets that are visible on the young Suillus pore surface in Christian’s photo aren’t mentioned for that species, either, but are mentioned in several descriptions for granulatus (Thiers, Arora).

Seems like the cap color can be quite variable in granulatus.

Are you saying that granulatus occurs ONLY with Pinus sylvestris in Europe, Irene? Maybe what we call S. granulatus here isn’t quite the same as the Eastern/European version?

The only thing
By: Irene Andersson (irenea)
2011-03-01 17:27:41 CST (-0500)

I can say for sure about this: It’s NOT Suillus granulatus (which by the way grows with Pinus sylvestris).

Canary Island Pine…
By: Debbie Viess (amanitarita)
2011-03-01 13:01:00 CST (-0500)

but a looooong way from the Canary Islands.

This tree is planted in many areas around the world that have warm climates, and is used extensively for reforestation in Southern Spain. And those tree farms always need their mycorrhizae to thrive, so it is likely that local European species formed the root associations there. So what European Suillus does this look like? Granulatus.

Thiers calls Suillus granulatus a “cosmopolitan species” found in varied pine forests across North America; Canary Pine is also widespread, in suitable habitat. Hmmmm, can there be a connection???

The physical barriers between movement of species are rapidly breaking down with human movement of plant materials. Probably best to assume nothing and look hard at what is actually in front of you. Collect and scope and chemical test some next time, Christian.

Or (shudder) do the DNA! Gee, sounds like a new dance craze. ;)

By: Douglas Smith (douglas)
2011-03-01 12:54:17 CST (-0500)

Ah, the edge was not soft and cottony? Then forget my suggestion, it isn’t that.
S. glandulosipes is out.

It was not a cottony roll
By: Christian (Christian Schwarz)
2011-03-01 12:31:39 CST (-0500)

It is an incurved margin.

And I agree with Noah – I didn’t really consider this likely to be a CA species. The native pine forest probably didn’t occur in this valley in recent times. It may have come in with Monterey pine, which could still host CA species, I guess.

is this even a CA species?
By: Noah Siegel (Noah)
2011-03-01 12:23:27 CST (-0500)

it was growing is a urban area under introduced pines…

By: Douglas Smith (douglas)
2011-03-01 12:14:50 CST (-0500)

What I can’t tell from the photos, is this an off-white inrolled margin? Or it is a cottony veil that is attached to the cap margin? The cottony veil is very soft, and an inrolled margin would be quite stiff. Need more notes…

according to Thiers…
By: Debbie Viess (amanitarita)
2011-03-01 11:06:51 CST (-0500)

who of course was working with strictly California material, it does have an inrolled margin. Here’s the quote:

“CA Mushrooms a Field Guide to the Boletes”, pg. 193:
“Pileus:…margin…incurved, becoming decurved.”

Inrolled cap margin
By: walt sturgeon (Mycowalt)
2011-03-01 10:08:38 CST (-0500)

does not fit S.granulatus.

not glandulosipes…
By: Debbie Viess (amanitarita)
2011-02-28 22:32:39 CST (-0500)

with its dark brown to black glandular dots.

glandular dots a better match for granulatus: dots are pinkish tan to vinaceous brown.

from Thiers: "tubes[of granulatus]…in very young stages beaded with cloudy liquid.

Neither sp. has an annulus, at least according to Thiers.

S. glandulosipes
By: Christian (Christian Schwarz)
2011-02-28 16:52:52 CST (-0500)

“With dense, dark brown to black glandular dots and smears”… sounds a bit more deeply colored.
But then again, their photo for this species doesn’t match that description either.

That looks pretty good
By: Christian (Christian Schwarz)
2011-02-28 15:04:12 CST (-0500)

Only differences I can tell are more slender stature, less glandular, and with paler colors in the Bessette book.

This should be easy
By: walt sturgeon (Mycowalt)
2011-02-28 10:24:14 CST (-0500)

Cap like S. luteus,cap margin like S. neoalbidipes,stipe ornamentation like S. placidus. Great photos.

By: Erin Page Blanchard (CureCat)
2011-02-27 23:57:16 CST (-0500)

This is different from the unidentifiable Suillus I find in San Diego county…. I guess I will post photos if I can decide how many species occur in the area that I was photographing them.

Created: 2011-02-27 23:16:10 CST (-0500)
Last modified: 2011-06-29 02:44:07 CDT (-0400)
Viewed: 513 times, last viewed: 2020-07-02 17:34:53 CDT (-0400)
Show Log