Observation 170974: Xerocomellus rainisiae (Bessette & O.K. Mill.) N. Siegel, C.F. Schwarz & J.L. Frank

Under fir, hemlock and Douglas-fir.

Proposed Names

61% (2)
Eye3 Eyes3
Recognized by sight: Dark brown cap matted tomentose cap that developers olive color and becomes aereolate in age. Deep blue-green staining stipe, pores.
Based on chemical features: ITS matches type 100%

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
X. rainisii
By: Alfy (Alfy)
2014-08-07 12:31:02 CEST (+0200)


did you sequence the holotype collection of B. rainisii?



Thanks Noah,
By: Roy Halling (royh)
2014-07-24 17:08:15 CEST (+0200)

and so the justification for placement in Xerocomellus is supported by what exactly? I’m not suggesting that Cyanoboletus is justified. Data to support placement needs to be offered.

By: Noah Siegel (Noah)
2014-07-24 17:01:29 CEST (+0200)

I edited my last comment before I saw your follow up question.

By: Roy Halling (royh)
2014-07-24 16:52:25 CEST (+0200)

are not published then, correct? Did you submit them to GenBank?

By: Noah Siegel (Noah)
2014-07-24 16:49:40 CEST (+0200)

submitted the sequences with the publication, but they weren’t published by IF.
They were uploaded to GenBank last week, and should be available shortly. Email me or Jonathan if you need it sooner.

Sequences public yet?
By: Roy Halling (royh)
2014-07-24 16:20:22 CEST (+0200)

Nomenclatural novelties via the e-publication facility offered at Index Fungorum seem to be getting traction. Unfortunately, peer review is lacking and all too frequently no justification is offered. A real pity IMHO.

None of my collections…
By: Dave W (Dave W)
2014-07-24 15:26:22 CEST (+0200)

of pulverulentus have exhibited aerolate caps. The surface starts out somewhat tomentose, like a bloom, and becomes increasingly glabrous but slightly roughened.

When Alan Bessette spoke at NEMF two years ago, I believe he mentioned that when he first encountered rainisii, he thought it was pulverulentus.

By: Noah Siegel (Noah)
2014-07-24 15:23:40 CEST (+0200)

of a cap

By: Noah Siegel (Noah)
2014-07-24 14:58:47 CEST (+0200)

The main difference is that C. pulverulentus stains deep blue through-out, while X. rainisii it’s mostly restricted to the stipe base and pores; (although the flesh will slowly stain light blue in age). As Christian alluded too, the finely-velvety/tomentose, cracking cap is very suggested of Xerocomellus, as is the red color on the stipe base.

By: Christian (Christian Schwarz)
2014-07-24 04:00:49 CEST (+0200)

Yes, it was merged into Cyanoboletus for mostly flimsy reasons (ie. it looks superficially like C. pulverulentus). But genetic data, and the areolate cap in age place it in Xerocomellus.

I’m wondering if this has been changed to…
By: Dave W (Dave W)
2014-07-24 01:32:59 CEST (+0200)

Cyanoboletus rainisii. It’s a virtual twin to the eastern pulverulentus.

Created: 2014-07-23 18:29:59 CEST (+0200)
Last modified: 2016-06-18 04:49:47 CEST (+0200)
Viewed: 158 times, last viewed: 2017-10-01 10:46:57 CEST (+0200)
Show Log