Thistle's picture

Brown Rollrim (Paxillus involutus)

Observed: 17th September 2013 By: ThistleThistle’s reputation in Fungi and LichensThistle’s reputation in Fungi and LichensThistle’s reputation in Fungi and LichensThistle’s reputation in Fungi and Lichens
Brown Rollrim (Paxillus involutus)
Brown Rollrim (Paxillus involutus)
Brown Rollrim (Paxillus involutus)
Brown Rollrim (Paxillus involutus)
Description:

Several of these growing in the lawn. Brownish cap with inrolled edge; pale decurrent gills; pale tan spores. Can anyone help with an ID, please?
Edit:Changed to match Little Auk's ID. Many thanks.

Identifications

Caution: Do NOT use iSpot to identify fungi to eat!

Some fungi are very poisonous so a mistaken ID could have serious consequences.

Species interactions

No interactions present.

Comments

marksteer's picture

Great to see some microscopy!

Great to see some microscopy! Please details - magnification, any special preparation of spore sample? I only have USB microscope to x200 mag so can't get to spore level. Have confirmed id as Paxillus involutus, species I see quite often.

The more I know the more I realise I don't know

Thistle's picture

Blind, blundering ignorance!

I wish I could give you some worthwhile information but I simply bought a cheap USB microscope from eBay with no instruction manual. It has 3 objectives: x4, x10 and x40.

I lay the fungus on a blank slide for a while until I can see that some spores have dropped then shove it under the x40 lens. It doesn't give me any detail of the spore surface and the software I have (ULead) doesn't allow me to calibrate the microscope to determine sizes. It does give some indication of the spore shape and, after you've done a few, an idea of relative spore size.

(Perhaps if we re-started this discussion on one of the forums we might both learn something?) (Edit: I've added it to the Photography forum. Fingers crossed.)

Ian