To explain some of those specifically:
- Fertilise 1 = At the end of the turn, turn one nearby tile of Soil to Fertile Soil if the mushroom was activated at least once this turn. (Fertile soil gives any mushroom activated on it a 1.25x multiplier, which carries to following activations so long as it continues chaining)
- Energy Boost: Similar to fertile soil, any chain following an Energy boost n will gain 1 + (.25 * n) multiplier as long as it continues chaining.
- Rapid Fire: This mushroom can activate mush more frequently. All mushrooms have a maximum activation amount (visible number) but they also have a cooldown (not displayed). Rapid Fire means this cooldown is so small it can almost always be activated by an incoming chain, regardless of frequency.