weird line of mushrooms

Long time player here, got a little journey mode world on my phone that I play when I'm out. Found a weird perfect line of naturally generated mushrooms just behind my dungeon, any explanation or just a freak accident?

Long time player here, got a little journey mode world on my phone that I play when I'm out. Found a weird perfect line of naturally generated mushrooms just behind my dungeon, any explanation or just a freak accident?