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There is a Legacy version here.

Poisonous MoldHazard 2

Environmental Fungus 
Source GM Core pg. 103 2.0
Complexity Simple
Stealth DC 21 (trained)
Description This grotesque fungus releases poisonous spores when a creature comes near.
Disable DC 18 Survival (trained) to safely remove the mold
AC 18, Fort +11, Ref +5
HP 30 (BT 15); Immunities critical hits, object immunities, precision damage, Weaknesses fire 10
Feed on Decay The mold expands when fed by blood or decay. If at any point a creature takes bleed damage while adjacent to the mold or a dying or dead body is adjacent to the mold, the mold grows to expand into every square adjacent to its current space. This can happen only once per day.
Spore Burst [reaction] (poison) Frequency once per day; Trigger A creature touches the mold, hits it, or damages it; Effect The mold explodes in a burst of spores and mold clusters, dealing 2d6+6 poison damage to creatures within 10 feet of it, with a DC 18 basic Fortitude save.
Reset Unless entirely eradicated (typically with acid or fire), the mold regrows over the course of 2 weeks.