You gain the ability to summon a spirit that assumes an animal form, as an action, you can expend a use of your Wild Shape feature to cast the find familiar spell, without material components.
When you cast the spell in this way, the familiar is a fey instead of a beast, and the familiar disappears after a number of hours equal to half your druid level.
Your symbiotic link to fungi and your ability to tap into the cycle of life and death grants you access to certain spells. At 2nd level, you learn the Chill Touch cantrip.
At 3rd, 5th, 7th, and 9th level you gain access to the spells listed for that level in the Circle of Spores Spells table. Once you gain access to one of these spells, you always have it prepared, and it doesn't count against the number of spells you can prepare each day. If you gain access to a spell that doesn't appear on the druid spell list, the spell is nonetheless a druid spell for you.
Circle of Spores Spells
Druid Level Circle Spells
2nd Chill Touch
3rd Blindness/Deafness, Gentle Repose
5th Animate Dead, Gaseous Form
7th Blight, Confusion
9th Cloudkill, Contagion