Mushroom

Stage 1: Ferry Terminal, Harbor Small rooms.
Stage 2: Airfield, Train Yard, Water Treatment, Sewer Branch, Radtown and Power Plant rooms.
Stage 3: Launch Site, Military Tunnel and Missile Silo rooms.
Stage 3 to 4: The Airfield airdrop and Chinook call terminals.

A percentage is the chance of that extra item. The wiki lists no amount where it shows 1 per pickup. Pickups and plants need no tool. Picture from RustHelp.

← The world

PLANT OR PICKUP

What you get

ITEM AMOUNT OR CHANCE

Mushroom 1 per pickup

Worm 5%

Grub 3%

A percentage is the chance of that extra item. The wiki lists no amount where it shows 1 per pickup. Pickups and plants need no tool. Picture from RustHelp.