Red Fern Type Growth within Bathroom.? Behind the toilet there is a small crack between floor board and...

Behind the toilet there is a small crack between floor board and wall. A red colored fern type plant is growing there.
What the heck is this and how do I draw from rid of it. This has happen before to a neighbor contained by their bathtub, but they never figure out what it was and ripped out the entire bathroom to capture rid of it. I really do not want to go that far.
I own poured bleach on it turning a tan/white color. It is quite fiberous and I am unqualified to break it apart. It also appears to be wrapped around the hose that leads to the toilet cistern.
Thank you in credit for any ideas on this problem.
pam
I accidently flushed Clorox Toilet Wand contained by...
Answers:    sounds resembling prelude to invasion of the body snachers,check under bathroom for showery spot, if possible. you may stipulation to lower humidity in house if its a type of mold growth. mold requests 70% humidity to grow and a bathroom has it, you may necessitate to install an exhaust fan surrounded by there. as for slaughter growth, try brush-be -gone or round-up herbicide.mold is lethel if enough of it is around. if you own crawl space under house, be in motion look and see.if not sure what to look for, ring up exterminater ( bug killer) or plumber
The burners fall through to desk light on...
If possible dry out the area near a fan and treat beside bleach . 1 part bleach to 10 parts dampen. Sounds like some baseboard and possible sheet rock removal is contained by order.
Good Luck!
MSM