How in the hell am i supposed to obtain these seed types WHITE GRADE - Amanita Mushroom Hyphia seed & Arrow Mushroom Hypha seed in order to complete this quest?

At least add a mushroom seed vendor so we can complete this!

Cheers,

https://www.somethinglovely.net/bdo/

Click on Show Gathering Locations --> Mushrooms

Click the mushrooms you need

Equip a hoe and go gather them.

I suppose you could eventually get the hypha from gathering, but the easy path for that quest would be to just by high quality hypha from the market, then plant and breed those until you get specials.

Or does that quest specifically have a "gather hypha" requirement?  Look at the quest widget, not the quest description.

eta: This has a better suggestion https://bdocodex.com/us/quest/3510/111/:

"You could simply buy the Special Amanita/Arrow Mushroom Hypha (if there's any on the marketplace) and breed itself for quest completion."

Yep, better to start with special already if available.

Very simple,  you need a farming fence, then go to the central market, buy one of each special version.  Plant them then breed them when they are grown.