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Agrocybe pediades
Cap: 1-4 cm; convex, broadly convex, or nearly flat; yellow brown or paler; smooth; dry or sticky; occasionally with whitish partial veil remnants on the margin. Gills: Attached to the stem; pale grayish brown becoming brown to rusty or cinnamon brown in maturity; close or, in my experience, often nearly distant; when young covered by an ephemeral white partial veil. Stem: 2-6 cm long; 1.5-5 mm thick; more or less equal; smooth; colored like the cap; sometimes twisted-grooved. Flesh: Pale and thin. Taste: Not distinctive or mealy; odor not distinctive or mealy. Spore Print: Brown. Chemical Reactions: Cap surface red to pink with KOH.
growing alone or gregariously in lawns, meadows, and other grassy areas (and sometimes on wood chips, dung, or sand); summer (but nearly year-round in warm climates)
Spotted in Lavandeira natural park,one the nature parks net that The Vila Nova de Gaia implemented
Agaricus mushrooms (including A. campestris) are generally large, chunky mushrooms with chocolate brown gills at maturity. This is clearly much smaller and less robust. I think it is very likely an Agrocybe, to tell for sure which you'd need a microscope and a good key to Agrocybes, but for the sake of an ID on here I'd say A. pediades is a close match.
Thanks Patty for the ID and for the nice comment,i'll check it latter
Thanks Hemma
Great spotting António and nice series. Due to its white color, ring, cap and it bottom laminated color, I would say it is an agaricus campestris. http://en.wikipedia.org/wiki/Agaricus_ca...
It has a cosmopolitan distribution. I doubted because I thought it might be too thin but I don´t see any others which have all those features together and there SEEM to be thin cap types... Greetings =)