The fungus Diaporthe samaricola produces small black dots on the samara (keys) of Ash. Care is needed as another fungus, Neosetophoma samarorum produces even smaller black dots on these keys.
Please provide a photograph. Some indication of size may also be helpful.
On the samara (keys) of Ash
Winter and early spring.
Seems to be widespread in Britain, but is under recorded.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015