mycelium
my.ce.li.um \-le--*m\ \-le--*\ n or my.ce.lia [NL, fr. myc- + Gk he-los nail, wart, callus] pl : the mass of interwoven filamentous hyphae that forms esp. the vegetative portion of the thallus of a fungus; also : a similar mass of filaments formed by a higher bacterium