Prokaryote

Lactobacillus is a genus of gram positive faculative anaerobic or microaerobic bacteria. Lactobacillus is good and helps people  because they are the production of yogurt, cheese, pickles, beer, wine, and chocolate.Armillaria ostoyae is a fungus of the honey mushroom genus commonly known as Shoestring Rot. Its bad because it infects the tree stumps that grow on the stumps.  It is also poisonous to people if they touch or eat it.


http://www.mushroomexpert.com/armillaria_ostoyae.html
http://www.mayoclinic.com/health/lactobacillus/NS_patient-acidophilus