jwh93's picture

Tar spot fungus

Observed: 28th November 2009 By: jwh93
S159 Neighbourhood Nature - current student
jwh93’s reputation in Fungi and Lichens

Caution: Do NOT use iSpot to identify fungi to eat!

Some fungi are very poisonous so a mistaken ID could have serious consequences.

Species interactions

No interactions present.

Species with which Tar-Spot Fungus (Rhytisma acerinum) interacts


Norwichnaturalist's picture

Tar spot

Rhytisma acerinum is a pollution monitor. Very abundant in Suffolk and Norfolk on dead dying and live leaves from August

Colin Jacobs.
Wild Flower Society member

cooperj's picture

Tar spot as pollution monitor

there is some debate about tar spot being a pollution monitor (for sulphur dioxide). The correlation between lack of tar spot and urban areas has been linked to the clearance of leaf litter in urban areas. Germinating spores from fruitbodies (apothecia of a cup fungus) appear on the black stroma in the spring and re-infect the living trees. If the litter is removed then there is no innocolum - see Leif a& Fowler 1988, New Phytologist, v108, p175

Jerry C