Boletes for ID & Confirmation Please

Lancashire Lad · #1 (**permalink**) 20-07-2009, 08:57 PM

Photographed these today, in a local mixed woodland.

Red Cracking Bolete - Boletus chrysenteron

Can't decide on this one? (Two full size fruitbodies about 120mm tall, cap size about 100mm diameter, plus a less developed fruitbody of the same type).

Any help with ID much appreciated.
Regards,
Mike.

ManwithNoname · #2 (**permalink**) 20-07-2009, 10:34 PM

The first is, as you suggest, one in the complex around Boletus chrysenteron. The young specimen has a look of Boletus pruinatus but these are hard to place without microscopy.

The second is a Leccinum but there is not enough information to take it any further.

Lancashire Lad · #3 (**permalink**) 20-07-2009, 10:40 PM

Thanks manwithNoname.

Quote:

Originally Posted by ManwithNoname

....The second is a Leccinum but there is not enough information to take it any further.

Is this because it needs microscopy, or should I have obtained some other info/details at the site? (eg. it was growing under Fagus).

Regards,
Mike.

mollisia · #4 (**permalink**) 20-07-2009, 10:52 PM

Hello,

Xerocomus chrysenteron is possible, but other Xerocomi or too. To identify Xerocomus chrysenteron group a cut through the whole fruitbody and it colour change after appr. 5 minutes is very important.

The Leccinum is Laccinum carpini, the rough structure of the cap is unique. So there must have been also hornbeam (Carpinus) and not only beech.

best regards,
Andreas

ManwithNoname · #5 (**permalink**) 20-07-2009, 10:52 PM

Yes, you need to know what tree it was growing with. But your specimens are rather old and lack important characters such as the colour of the scales on the stem. See the website below for the sort of information you need to key these species out properly.

leccinum in Europa - engels

The texture of the cap could well suggest this is what was called Leccinum carpini, now Leccinum pseudoscabrum, which can grow with hornbeam or hazel. I wouldn't have been confident of this myself without a slice through the middle to show the colour change.

Lancashire Lad · #6 (**permalink**) 20-07-2009, 11:03 PM

Many thanks to both of you.
It is such additional information as this, which greatly helps a beginner like myself, and is much appreciated.

Regards,
Mike.

Andy Overall · #7 (**permalink**) 20-07-2009, 11:25 PM

Quote:

Originally Posted by Lancashire Lad

Photographed these today, in a local mixed woodland.

Red Cracking Bolete - Boletus chrysenteron

Can't decide on this one? (Two full size fruitbodies about 120mm tall, cap size about 100mm diameter, plus a less developed fruitbody of the same type).

Any help with ID much appreciated.
Regards,
Mike.

I would whole heartedly agree with L. pseudoscabrum for your 2nd pic. The first I would say was closer to Xerocomus subtomentosus but this section of Boletus is fraught with difficulties and once again needs closer inspection.

Andy

SheffieldLass · #8 (**permalink**) 21-07-2009, 01:23 AM

I thought I'd add a couple I found today.

The first young Suillus with larch. I presume S grevillei, but have left them to mature a bit.

The second which I think I've finally got an ID for - Xerocomus impolitus. I was going to say found under birch, but actually I found a rather chewed cap but no stem (and I searched hard for it) in the grass near birch, and then spotted another halfway up a hawthorn tree. Nibbled stem, so I suspect it had been carried there by a squirrel. So it depends where it had carried it from what it was associated with.

photographed where found!

This had a distinct chemically smell to the base of the stem, ammonia or melzers (and I hadn't used either on it at that point). The cap had a slightly milder smell, like the stem but with a fruity overtone. The pores didn't bruise under firm thumb pressure, but did bruise blue under deep thumbnail pressure. Older specimen the pores had turned a bit orange. The cap flesh was whitish, and unchanging. The stem flesh turned slightly ochre to pale brown after cutting. Cap flesh not changing with ammonia. Spores pale and 10.6-12.9 x 3.9-4.7, Qav = 2.7 (though these were measured from the pore squash so may be a bit immature and small).

Also what might be a cheilocystidia

Pileipellis in congo red, no incrusted pigment found.

I don't have a detailed boletales monograph to check the details with, but from what I've found from various sources seem to point to X impolitus.

Melanie

Oops, missed including the blueing pores, on the older, heavily chewed specimen.

FungiJohn · #9 (**permalink**) 21-07-2009, 12:27 PM

Hi Melanie

A phenolic smell is often noted at the base of the stem in impolitus and they are generally quite robust in shape. A very good find!

John

flaxton · #10 (**permalink**) 21-07-2009, 12:32 PM

Melanie
I think you are spot on with S. gravellei but I am not so sure about your X. impolitus. (It was for a time put in Xerocomus by some people but I think it is now accepted as a Boletus.) It is normally a much more robust fruitbody and when it is cut there is a distinct yellowing just under the cuticle of the cap and stipe. The stipe is lemon yellow at the top and punctate over the full length. Your specimen looks to have a striate stipe without the "dots".
The lack of colour change with ammonia probably rules out B. subtomentosus and I would suggest B pruinatus.

Mal

Ps I have a new key for Xerocomus so PM me and I will send it across