Jonathan's picture

Jonathan - Suillus granulatus - 27th August 2008

Observed: 27th August 2008 By: Jonathan
iSpot team
Jonathan’s reputation in Fungi and LichensJonathan’s reputation in Fungi and LichensJonathan’s reputation in Fungi and Lichens
Suillus granulatus 12-11-2008 10-37-09
Suillus granulatus 12-11-2008 10-38-18
Suillus granulatus 12-11-2008 10-36-55
Boletus 27-08-2008 18-27-46
Boletus 27-08-2008 18-29-36
Suillus granulatus 12-11-2008 10-36-16

These were growing beneath a pine tree
The first ones photographed with my mobile phone were found in August, but then I found some more in the same place on 11 Nov after a warm and wet spell. These, and help from Miked, enabled me to identify the species which conforms pretty precisely to the description in Courtecuisse & Duhem's Collins Field Guide (Fig #1643 to be exact).


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Species interactions

No interactions present.


miked's picture

Well its in the Boletus

Well its in the Boletus group but more likely a Suillus. Very important to know which trees were growing around e.g. were there pines or larch?

Jonathan's picture

Nearest tree was an

Nearest tree was a pine (not an oak)
Jonathan Silvertown

University of Edinburgh and Biodiversity Observatory (OU)

miked's picture

Interesting, but i note on

Interesting, but i note on the ground that there are pine needles. there are several Suillus with different conifers so very important to note which ones around. if it was actually growing with the oak then potantially rather unusual, wonder if they ever ID'd that boletus I found over at mount farm, if it was what i think then there are only a handful of records ever for uk on nbn. fungi round mk may turn out to be rather interesting if only because nobody bothers to record them in urban areas.
I also found B. impolitus under oak at the OU, a large clump of them, these are again far from common in uk but might turn up with the occasional oak trees scattered round mk.

miked's picture

I would say its definitely a

I would say its definitely a Suillus and possibly the most likely species is S. collinitus but I am not certain about this especially as the pores seem a bit large for the discription in Phillips 2006 mushroom book (link to list of references on fungi on separate page?, when is the updated version of Bon coming out, already 2 years overdue). Phillips also says this species is rare.
Note the location shown on the map for the photo is actually under a large oak tree although there various groups of pines not too far away.

miked's picture

I went back to the place and

I went back to the place and found another, larger specimen, this time the pores were bright yellow as in the versions you show in the photo and the pores were somewhat smaller and not so angular. Interestingly this was on the opposite side of the road to the ones you found although only about 20m away. unfortunately the stem was deformed and damaged so could not see the characters normally associated with s. collinitus, anyway I still think it was this species.
it is clearly somewhat variable as the paper below demonstrates:
Isozyme variation and somatic incompatibility in populations of the ectomycorrhizal fungus Suillus collinitus
1 Laboratoire de Recherches sur les Symbiotes des Racines, INRA-ENSA, 2, Place Viala, 34060 Montpellier Cedex 1, France
Copyright 1996 The New Phytologist
Genets • isozyme variation • population • somatic incompatibility • Suillus collinitus

Isozyme variation and somatic incompatibility were investigated in order to study intraspecific genetic variation and to identify genets in natural populations of the ectomycorrhizal fungus Suillus collinitus (Fr.) O. Kuntze, Forty-three isolates, obtained from basidiocarps collected in 11 forest sites under Pinus trees, were examined. Isozyme analysis indicated high intraspecific variation between isolates from the same location and from different locations. Phenetic analysis based on calculated dissimilarity values derived from isozyme banding patterns separated the isolates into two main groups (I and II) with 35% dissimilarity. A specific and highly active acid phosphatase isoform (ACP-2) was detected in most group II isolates. Dikaryotic isolates displaying isozyme similarity coefficient of 100 % were found to be somatically compatible and were considered to originate from the same genet. The same genet was never found at more than two forest sites. This study showed a high correlation between the results of electrophoretic isozyme analysis and those of somatic incompatibility reactions. The results were discussed in terms of population biology.

Jonathan's picture

Where is your picture of the ones you found?

Jonathan Silvertown

University of Edinburgh and Biodiversity Observatory (OU)