Fixing def'n of stolon- can be both aboveground and below.

plant-ontology.obo

@@ -2662,8 +2662,8 @@ relationship: part_of PO:0009005 ! root
 id: PO:0003024
 name: stolon
 namespace: plant_anatomy
-def: "A branch that is slender, prostrate or trailing and above-ground and produces roots and sometimes erect shoots at its nodes." [APweb:Glossary, POC:curators]
-comment: The stolon develops from an axillary bud and produces adventitious roots at the nodes and a terminal aerial stem. That stem then sends out one or more stolons from its axillary buds and the process is reiterated. A unique part of this process is that the first internode of a stolon is very long and then the shoot becomes an erect rosette.
+def: "A branch (PO:0025073) that is prostrate or trailing, and produces  adventitious nodal roots (PO:0003005) and sometimes erect shoots." [APweb:Glossary, POC:curators]
+comment: The stolon develops from an axillary bud (PO:0004709) and produces adventitious roots (PO:0003005) at the nodes and a terminal aerial stem. That stem then sends out one or more stolons from its axillary buds and the process is reiterated. Stolons may be above ground, as with strawberries, or below ground as in potatoes.
 subset: reference
 subset: TraitNet
 synonym: "estol&#243n (Spanish, exact)" EXACT Spanish [POC:Maria_Alejandra_Gandolfo]