Where does “rörsopp” come from?

rörsopp (Swedish) comes from Swedish sopp, from Old Swedish sopper, from Old Norse svǫppr, from Proto-Germanic *swammaz, from Proto-Indo-European swombh- — sponge, tree-fungus, swamp.

Ancestry of “rörsopp”, step by step

rörsopp traces back through two separate lines of ancestry.

via Swedish sopp

StepLanguageWordMeaning
1Swedishsoppfungus belonging to the Boletales order
2Old Swedishsopper—
3Old Norsesvǫpprsponge, mushroom; ball
4Proto-Germanic*swammaz—
5Proto-Indo-Europeanswombh-sponge, tree-fungus, swamp

via Swedish rör

StepLanguageWordMeaning
1Swedishröra reed, a cane, a straw; a cane; a reed
2Old Swedishrør—
3Old Norsereyrrreed
4Proto-Germanicrauzaz—
5Proto-Indo-Europeanresg-to weave, plait; to plait, wattle; to weave, to...
Every word from Proto-Indo-European swombh- →Every word from Proto-Germanic *swammaz →Every word from Old Norse svǫppr →