Bluecap is a consumable item that can be used as Camp Supplies to initiate Long Rests.
While bland and tasteless, bluecap spores are your best bet at finding something edible in the Underdark.
Properties
Camp Supplies: 2
Single Use
Rarity: Common
Weight: 0.2 kg / 0.4 lb
Price: 1 gp 
UID
CONS_FOOD_Mushroom_BluecapUUID
87e53fac-efc7-4d4a-b28d-675afa7bd564