miked's picture


Observed: 30th November 2007 By: miked
iSpot team
Fungi and Lichens expert
 MG 2307

On very dead log of broadleaved tree possibly elm. Date not correct as from slide, will check to get right month and year later. Image on right april 2007, one on left at least 4 years before this but from same place.


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.


Exobasidium's picture


This looks very much like a bracket of Ganoderma galled by Agathgomyia wankowiczii. Note the circular opening towards the centre of each 'lump'.

miked's picture

Agathomyia wankowiczii is

Agathomyia wankowiczii is this a gall wasp?

miked's picture

Checked back through my image

Checked back through my image collection and came across same phenomena several years apart so clearly there is a thriving population of each organism. The image on the left shows part of a fallen beech tree with Ganoderma fungus and the gall wasp, the trunk was covered in brackets with many hundreds of the galls on the fungus.
Wonder how common this is as I had not noticed it before until you pointed out what it might be, will keep an eye out for it in future. The nbn map shows no records but this might just be because that group of organisms is not yet mapped - does anyone know if this is the case?

Martin Harvey's picture

Agathomyia wankowiczii

Agathomyia wankowiczii is a fly, in the family Platypezidae, sometimes known as flat-footed flies (which I believe is a translation of Platypezidae and refers to their flattened hind tarsi).

Agathomyia wankowiczii arrived in Britain in the 1990s and has been spreading. It's a rather attractive orange fly, see Jufy Webb's photos and further information at:


(for this second link you need to scroll down towards the bottom of the page to find the bit about Agathomyia)

Entomologist and biological recorder

miked's picture

There is a suggestion that

There is a suggestion that the only European species of Ganoderma affected by the galls is G. applanatum which is a way of distinguising the different Ganoderma species as otherwise they are very tricky. However this only means that if the fungus has the galls its G. applanatum, if it does not have the galls it does not mean that its not G. applanatum!

I see that buglife are after records of the gall so will email them with this link. Will also check back through my images of the Ganodermas over time (I have a few from different locations) to see if any of the others have the gall. A (rare?) case where taking photos is actually better than just noting down that the one, fungus, species was present as its possible to track the spread of the insect too.

Have checked several old Ganoderma images mainly from different places in New Forest and milton keynes area and none of them had the galls.

Exobasidium's picture


I have one record on Ganoderma adspersum.