Galls on Equisetum

Michael Matus matus at
Fri Jul 24 00:40:20 EST 1998

Wim de Winter <xxxRemove_thisxxxxxWim.deWinter at> wrote:

>Sometimes I find populations of horsetails (Equisetum arvense and E. x
>littorale) where many of the stems show growth deformations. Severeal
>internodia then have not streched well so the sheaths are overlapping.
>Somtimes one side of the stem is retarded more than the other side thus
>causing  a bend down. Dependent on the height of the gall along the
>stem, the bend is recovered (zig-zag stem) or the stem continues
>horizontally or even downward.
>Does anyone know the cause of this phenomenon?

I do not know the answer, but I have found this phenomenon in Equisetum hyemale
quite frequently. You can see a picture of it at my homepage:

Michael Matus

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