RobSpot's picture

Strange Hemlock Water Dropwort

Observed: 27th June 2012 By: RobSpotRobSpot’s reputation in PlantsRobSpot’s reputation in Plants
oenanthe crocata odd umbel1
oenanthe crocata odd umbel2

Can anyone suggest what's happened to this strangely inflated umbel of Hemlock Water Dropwort?

Species interactions

No interactions present.

Species with which Hemlock Water Dropwort (Oenanthe crocata) interacts


GrizzledBadger's picture

probably been parasitised &

probably been parasitised & plant tissue reacts to form a gall. (wasps, flies/midges, mites & fungi can all be gall causers)


AlanS's picture

Protomyces macrosporus

In this case it's a fungal gall - Protomyces macrosporus (Taphrinales) - which can cause such galls in leaves and inflorescences of a number of umbellifers.


RobSpot's picture

Thank you

Although these photos were taken in rather poor light the subject literally stood out like a sore thumb - or several!
I hadn't considered a fungal gall - interesting.