Observation 113712: Pluteus salicinus group

When: 2012-10-17

Collection location: Fort Flagler, Jefferson Co., Washington, USA [Click for map]

Who: Caleb Brown (Caleb Brown)

No specimen available

Proposed Names

-85% (1)
Recognized by sight: striate cap margin, cap wrinkled in the center
61% (2)
Recognized by sight: crowded gills, darker cap, brown discoloration at the edges.
Based on microscopic features: Spores= 9.5×6.5µ
93% (3)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Caleb Brown (Caleb Brown)
2013-09-12 17:20:22 CEST (+0200)

for the info! i still have lots of studying to do, and hunting =)

blue staining
By: Alfredo Justo (Fredo)
2013-09-12 15:09:29 CEST (+0200)

yes, as far as I can tell without going in detail through the literature cyanopus and phaeocyanopus are the only cellulodermas with blue staining

Although traditionally P. albostipitatus has been placed in sect. Hispidoderma it actually belongs in sect. Pluteus, in the same group as P. salicinus. It has very poorly developed metuloids that can be easily confused with non-metuloids. P. albostipitatus is probably not a single species but a species-complex, widespread in tropical and sub-tropical areas. A similar case is Pluteus glaucotinctus that belongs in the same group and also has blue staining but there are no records for that one in NA

In Pluteus sect. Celluloderma…
By: Caleb Brown (Caleb Brown)
2013-09-12 02:53:59 CEST (+0200)

Are the blue staining species still just cyanopus, and Phaeocyanopus?

What bout Pluteus albostipitatus? is it the only blue staining species in section Hispidoderma?

I thought as much.
By: Caleb Brown (Caleb Brown)
2013-09-12 02:26:58 CEST (+0200)

Thanks for the papers, i have the latter PDF, but the former is new to me and very interesting Thanks

By: Alfredo Justo (Fredo)
2013-09-11 17:32:22 CEST (+0200)

the bluing in this group is almost certainly caused by the presence of psilocybin

there is an article by S. Saupe on the subject


the collections that he used in the study turned out to be not salicinus but a close relative that we renamed “saupei”. Although the presence of psilocybin has not been tested in all taxa in this group it is assumed that the blue-green colors correspond to that.

By: Caleb Brown (Caleb Brown)
2013-09-11 17:13:23 CEST (+0200)

Interesting, I will have to double check the spot this year, been hoping to find more “salicinus” thanks for the paper link. These species that belong in the salicinus group.. do they show bruising, any alkaloidal testing being done? Very cool stuff =)

salicinus group
By: Alfredo Justo (Fredo)
2013-09-11 16:54:57 CEST (+0200)

the presence of erect fibrils in the pileus is not uncommon for some taxa in sect. Pluteus e.g. Pluteus salicinus, P. pellitus, P. petasatus, etc…It is hardly a constant character, and there is infra an inter-specific variation but the species that I mentioned have this type of fibrils quite commonly

Macroscopically this collection would fit the description of P. salicinus the problem for using salicinus for this collection is that neither the substrate (conifers) or the geographical origin (Western NA) correspond to salicinus (as defined in our ongoing project on sect. Pluteus)

There are many conifer-associated taxa in sect. Pluteus (e.g. Pluteus pouzarianus, P. primus, P. atromarginatus and several species that will be described in the near future). Predominantly grey colors are common for some of these species, so ecology and colors of the pileus will point in that direction,although it is true such intense blue bruising has not been described for these species.

The salicinus group in NA is so far composed of:

- NA “salicinus”- different from the true Eurasian salicinus.
- An undescribed taxon from the Appalachians
- Pluteus saupei – Described a couple of years back, based on material from the Great Lakes area
- A taxon in the Pluteus albostipitatus complex found in Florida and possibly confined to sub-tropical NA.

You can find a bit more about the species in this group here:


We are now finishing up a big collaborative project that studies sect. Pluteus in Eurasia and NA, so in the near future full descriptions of all the species and a revision of the status of old names in this group will be available.

What species are in the Pluteus salicinus group?
By: Caleb Brown (Caleb Brown)
2013-09-11 05:33:03 CEST (+0200)
It was in a willow grove, on very decayed cedar.
By: Caleb Brown (Caleb Brown)
2013-09-11 05:16:20 CEST (+0200)

If I find it again this year i will do more micro. What conifer associated taxa in the cervinus complex shows blue bruising, or a dark grey cap with dark fibrills at the center. ?
forget the bruising, is there any pluteus in section pluteus that has a darkened central zone with erect frbrils on the pileus? Not trying to be a smartass here, i really just want to know if you know of any.

salicinus group
By: Alfredo Justo (Fredo)
2013-09-10 21:57:24 CEST (+0200)

bluing colors + metuloids + (relatively) big spores point to the salicinus group, but it could also be one of the (many) conifer-associated taxa in the cervinus complex

both the habitat (conifers) and geography (West NA) make it an unlikely candidate to be the true salicinus

By: Caleb Brown (Caleb Brown)
2012-10-19 08:53:12 CEST (+0200)

I switched it to salicinus after microscopy. Thanks been a long time coming to find one of these, love that blue stem shot!

By: Richard Kneal (bloodworm)
2012-10-18 23:26:28 CEST (+0200)

has “horn-like projections.”
the pleurocystidia of Pluteus cyanopus does not.

nice find man!!

Created: 2012-10-18 02:48:07 CEST (+0200)
Last modified: 2013-09-12 02:49:26 CEST (+0200)
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