Matweed is a thick, tangled type of vegetation which floats on the surface of the oceans of Skye (Reavers' Deep 2018) in large patches. Properly processed, it is an excellent foodstuff. Unfortunately, matweed pollen is dangerous; roughly 80% of all humans who breathe matweed pollen are subject to a severe allergic reaction which has been known to cause almost immediate death, and which is at best highly distressing and uncomfortable while it lasts. Filter masks and conditioned residences are essential to avoid exposure to drifting, airborne pollen.