PLANT GALL CLASSIFYING SYSTEM
as described by Arnold Darlington in "Plant Galls in Colour"
Causitive agents located plant tissues
krebs gall- caused by surface agents
filz gall- caused by agents among surface hairs
fold/roll gall- caused by agents within turned-over leaf blades
pouch gall- caused by agents within a cuplike structure that occurs when opposite ends of the infected structure arch upward and form a spherical oval
Causitive agents located plant tissues
covering gall- caused by agents embedded within a gall when plant tissues rise up and surround the parasite
lysenchyme gall- caused by agents that sink into the plant when the plant cells dissolve away and close around the parasite
mark gall- caused by agents burrowing within plant tissue before gall develops