In contrast to almost all of the described mycotoxins, the synthesis of this metabolite is stimulated by increased concentrations of salt and sugar. Like the phylogenetically distant Hortaea werneckii, W. ichthyophaga forms multicellular
meristematic clumps at all salinities. In contrast to the other two Wallemia species described to date, hyphal growth in liquid
cultures is almost absent in W. ichthyophaga. Additionally, its meristematic clumps are covered in a salt-dependent manner
with an extracellular polymeric substance matrix, with increased formation at suboptimal, lower salinities (GundeCimerman et al. unpublished data).