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annulus

An annulus is the remaining partial veil tissue which has separated from the cap's margin during the mushroom's growth process and persistently adheres to the stalk.
In some species of mushrooms the annulus is fragile and can be absent due to weather conditions. In other species it is ever present, stubbornly a part of that mushroom until the end.


An annulus can be inferior ( lower ), median ( middle ) or superior ( upper ) in relation to stalk location.

Photo demonstrating an annulus on the stalks of honey mushrooms.
This photo shows a couple of honey mushrooms with the annulus intact on both.
On occasion an annulus can be partially absent or totally gone due to having fallen off.

Photo demonstrating an annulus on a Lepiota stalk.
In certain Lepiota mushrooms the ring ( annulus ) is so persistant, that is, tough,
that it can actually be slid up and down the stalk like a napkin ring on a napkin.


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