Where does “Baumschwamm” come from?

Baumschwamm (German) comes from German Schwamm, from Middle High German swamme, from Old High German swamp, from Old English swamm, from Proto-Germanic *swammaz, from Proto-Indo-European swombh- — sponge, tree-fungus, swamp.

Baumschwamm (German): A bracket fungus in the genus Fomitopsis

Definitions

A bracket fungus in the genus Fomitopsis

Ancestry of “Baumschwamm”, step by step

Baumschwamm traces back through two separate lines of ancestry.

via German Schwamm

Step	Language	Word	Meaning
1	German	Schwamm	sponge; fungus, mushroom, toadstool; morbid...
2	Middle High German	swamme	—
3	Old High German	swamp	—
4	Old English	swamm	mushroom, fungus; sponge; first/third-person...
5	Proto-Germanic	*swammaz	—
6	Proto-Indo-European	swombh-	sponge, tree-fungus, swamp

via German baum

Step	Language	Word	Meaning
1	German	baum	tree
2	Middle High German	boum	tree
3	Old High German	boum	tree, beam
4	Proto-West Germanic	baum	tree; beam
5	Proto-Germanic	baumaz	Alternative form of *bagmaz; tree, beam, balk;...
6	Proto-Indo-European	bʰew-	to grow, swell; to swell, wax, grow; to blow; to...

Every word from Proto-Indo-European swombh- →Every word from Proto-Germanic *swammaz →Every word from Old English swamm →