My dad particularly loved salt-rising bread! I remember eating it as a child. According to Wikipedia, "
Salt-rising (or salt-risen) bread is a dense white bread that was widely made by early settlers in the
Appalachian Mountains in a process that involves no
yeast. Instead, the
leavening agents are wild organisms ubiquitous in nature. Salt in the name is a
misnomer, since the salt levels are relatively low," And yes that article mentions using potatoes in the starter.
Here is a link to one recipe:
http://allrecipes.com/recipe/salt-rising-bread/