Ustilago filiformis


    The fungus Ustilago filiformis affects the leaves of various Glyceria species such as Reed sweet-grass (Glyceria maxima). The epidermis of the affected leaves rupture to reveal long narrow strips of the dark red-brown spore mass.

    Identification difficulty
    Recording advice

    Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed. Please state the host species when recording this fungus.


    Where the host species occur.

    When to see it

    Late summer and autumn.

    UK Status

    Widespread in England, less well recorded elsewhere in Britain.

    VC55 Status

    Status in Leicestershire and Rutland not known.

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    Leicestershire & Rutland Map

    MAP KEY:

    Yellow squares = NBN records (all known data)
    Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

    UK Map