American Phytopathology Society - Jobs, graduate assistantships

The American Phytopathology Society is a professional society devoted to studying plant diseases. This posting board lists regular jobs as well as graduate school opportunities

https://www.apsnet.org/careers/jobcenter/Pages/FindaJob.aspx

Opportunities through American Brylogical and Lichenology Society

http://www.abls.org

Mycological Society board: Graduate school opportunities

The Mycological Society of America is a professional society devoted to the study of fungi and fungal-like organisms. Professors who have funding and are looking for graduate research students will often post these positions at http://msafungi.org/category/studentships/