pluteus petasatus

ohgreatstew · #1 (**permalink**) 12-08-2010, 09:57 AM

I am 99.9% sure of the ID of this one, in fact I am quite pleased as this is not shown in RP or MJ's book, but I did find it in the Collins guide.... Would appreciate the usual praise and reassurance.....

Stewart

Ken Burgess · #2 (**permalink**) 12-08-2010, 10:12 AM

Sorry to be the bearer of bad news.

Pink gills (suggesting pink spores) and gills that are free from the stem could lead to Pluteus but only if there was no partial veil.

Your specimen has the remains of a partial veil along the edge of the cap and on the stem, which rules out Pluteus.

I think if you had taken a spore print it would have actually been a chocolate brown colour, leading to Agaricus.

Ken

ohgreatstew · #3 (**permalink**) 12-08-2010, 10:23 AM

The picture is deceiving, the gills are in fact going a cream colour, but look like they were white, and are said (In the Collins guide) to mature a greyish pink, I am not sure about the veil as the picture I have does show remenants of such around the edge of the cap, although there is no picture of the underside so I wasn't clear about that. The stipe is fat, larger at the base and although white does show brownish firbrils at the base. There is no sign of a ring. I am taking a spore print as we speak so will update when I am sure.

Ken Burgess · #4 (**permalink**) 12-08-2010, 10:28 AM

Quote:

Originally Posted by ohgreatstew

This photo does appear to show the remains of a ring, noticeably to the right of the photo towards the top of the stem. It's definitely not Pluteus and the characters point to Agaricus.

Ken

ohgreatstew · #5 (**permalink**) 12-08-2010, 10:50 AM

Thanks Ken..... I will change my percentage to 00.1% sure of pluteus then

as for argaricus where do we start!

NickCantle · #6 (**permalink**) 12-08-2010, 04:15 PM

It's interesting or atypical.

'Nuff said

Ditiola · #7 (**permalink**) 12-08-2010, 11:10 PM

Quote:

Originally Posted by ohgreatstew

Thanks Ken..... I will change my percentage to 00.1% sure of pluteus then

as for argaricus where do we start!

I think there is only one place to start with Agaricus and thats with a microscope and plenty of time and patience.

Peter

ohgreatstew · #8 (**permalink**) 13-08-2010, 06:33 AM

Well the spore print is white so that must eliminate most of them (I don't have a book that shows any argaricus with a white sproe print).....the gills are also still cream, no sign of them going brown, if anything they look like they are going to stay the same colour. Did not blush red when cut.

Ken Burgess · #9 (**permalink**) 13-08-2010, 09:58 AM

That's the wonderful thing about spore prints, providing you can actually get one. Easy to do, no microscopy needed and they can save you hours of messing around with keys in completely the wrong genus!

Starting from first principles, you need to know whether the gills are free from the stem. Assuming they are, you have a specimen with no volva, but with a partial veil and a pale spore print. The absence of a volva rules out amanitoid genera (with a volva and a partial veil) and vaginatoid genera (i.e. those with a volva and no partial veil). Pluteoid genera are ruled out because they have no partial veil. With a white or pale spore print, that now leads to Lepiota s.l.

The very chunky stem is deceptive but it seems you must have some sort of Macrolepiota/Chlorophyllum species. However, if the flesh does not stain orange on cutting, that would seem to rule out Chlorophyllum rhacodes. Further than that, I haven't a clue.

Ken

Ditiola · #10 (**permalink**) 13-08-2010, 01:32 PM

Quote:

Originally Posted by ohgreatstew

Well the spore print is white so that must eliminate most of them (I don't have a book that shows any argaricus with a white sproe print).....the gills are also still cream, no sign of them going brown, if anything they look like they are going to stay the same colour. Did not blush red when cut.

There is always Leucoagaricus: They have white spores!