Observation 129710: Leccinum aurantiacum (Bull.) Gray

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Shouldn’t we
By: Irene Andersson (irenea)
2013-03-03 10:52:32 CST (-0500)

be aiming at using the right names – and the same names for each taxon?

I have to say
By: Gerhard Koller (Gerhard)
2013-03-03 09:41:30 CST (-0500)

the same as Adolf: I really begin to dislike the option that everyone out of nothing can change one’s observation’s names.
If someone is looking for the red cap usually growing with oak then he still will look at Leccinum quercinum and not aurantiacum if he is not on the latest taxonomic (and sometimes silly) trip. If someone is looking for the red cap usually growing under aspen he still will look at Leccinum aurantiacum (or rufum) and not albostipitatum if he …. bla bla bla.
There are many finds here that run under this name and under that name e.g. Boletus ferrugineus against Xerocomus ferrugineus. I don’t know how to solve this all but I really dislike it.

By: Gerhard Koller (Gerhard)
2013-03-02 06:04:38 CST (-0500)

you are from Sweden where these species may be rare. Here they are all common (except for L. populinum if you regard it as “good”). I never had a major problem of telling them apart. The problems lie within the brown-headed Leccini though ;)

I think
By: Irene Andersson (irenea)
2013-03-02 05:56:57 CST (-0500)

the names were a bigger mess earlier. Henk den Bakker’s presentation in
was a relief.
I wasn’t able to tell aurantiacum and quercinum apart before when I found them in habitats with both oak and aspen :-)
I have never tried to apply the names rufum or populinum on any other species.

L. albostipitatum became clear to me when I finally found them, with completely white stems. I have only seen it once and didn’t take a photo…

I know this paper
By: Gerhard Koller (Gerhard)
2013-03-02 05:03:02 CST (-0500)

and I know Machiel Noordeloos. He is a specialist in Entoloma but not in Boletales IMO.
I always used the name L. aurantiacum for L. rufum, the red capped Leccinum under aspen. I know and I myself have found L. quercinum with poplar, you can tell it apart from L. rufum by its darker color and the reddish floccules on the stipe, I haven’t seen it with birch. I also do not like the name L. albostipitatum for L. rufum. IMO it is just an extra mess to a very difficult genus. I have found what is called L. populinum in Sweden (photos somewhen in time ;) ) but I am not convinced this is a good species too. The squamules on the stipe should be vividly orange red from the youngest stages on though.

I prefer
By: Irene Andersson (irenea)
2013-03-02 03:56:47 CST (-0500)

to call it aurantiacum (including quercinum and populinum).
This paper
shows that collections with oak and poplar are the same. It can grow with birch too and then be mistaken for versipelle…

It’s an interesting report, because it also includes North American material, and discusses the evolution of host connections.

It doesn’t exclude the possibility of additional, yet unnamed species, though.

Created: 2013-03-01 17:42:09 CST (-0500)
Last modified: 2013-03-03 12:35:01 CST (-0500)
Viewed: 68 times, last viewed: 2017-06-15 12:08:28 CDT (-0400)
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