Section - The mold
The petter-mold is a backdrop. Every petter-room contains the petter-mold. The printed name of the petter-mold is "mold". Understand "mold/lichen/moss/rot/fungus" and "fungal growth/bloom" as the petter-mold. The description of petter-mold is "Splotches of yellow mold can be found on almost everything in here. When touched, it releases a cloud of spores."
Instead of touching or taking or taking off or rubbing or squeezing the petter-mold:
say "A puff of spores is released whenever you touch the yellow mold."
Instead of cutting the petter-mold when the player carries a petter-sharp petter-machete:
say "[one of]As you scrape off some mold, it turns into a cloud of spores[or]There is too much mold to scrape it all off[stopping]."
Understand "scrape off/-- [petter-mold]" as a mistake ("There is too much to scrape it all off.").