Colonies of Paenibacillus dendritiformis bacteria, T morphotype, grown on hard agar and under increasingly severe starvation. The colonies present
compact, tip-splitting and ordered patterns as they utilize several mechanisms to adapt to the different conditions. This figure was taken from Nature 368:46-49 (1994)
-- Oh good! It's amazing how much you can do with exponentials! says
Dr Forland to you.