Glowcaps are a traditional currency among sporelings, which can be found all over Zangarmarsh. They appear as large red glowing mushrooms. They are used to buy the reputation rewards from , the Sporeggar Quartermaster, once you become neutral to the Sporeggar.
Besides on the ground players will also receive a Glowcap when they complete one of the following quests:
Glowcap as a quest objective
Each quest turnin is worth 750 reputation and the quest is repeatable until 2999/3000 neutral.