Spurs are short, stubby, side stems that arise from the main stem and are common on such fruit trees as pears, apples, and cherries, where they may bear fruit. If severe pruning is done close to fruit-bearing spurs, the spurs can revert to a long, nonfruiting stem. A stolon is a horizontal stem that is fleshy or semi-woody and lies along the top of the ground. A runner is a type of stolon. It is a specialized stem that grows on the soil surface and forms a new plant at one or more of its nodes.
Strawberry runners are examples of stolons.
Remember, all stems have nodes and buds or leaves. The leaves on strawberry runners are small but are located at the nodes which are easy to see. The spider plant also has stolons. A tuber is an enlarged portion of an underground stem like potato tubers, tulip bulbs, and iris rhizomes are underground stems that store food for the plant. The tuber, like any other stem, has nodes that produce buds.