Does it make sense that a single genus parasite would be capable of parasitizing so many kinds of dissimilar flora? Or does it not really matter at this point, because there are already pests an parasites that feed on multiple kinds of dissimilar flora?
I wonder whether the presence of these parasites, and how they don't feed on plyents, would give plyents a big advantage in glaciers, tundras, and dunes/hot deserts. Or perhaps nonvascular flora would dominate more there.
Are they absent from their environments because of a lack of flora, lack of large flora, or due to not being able to withstand extreme cold, extreme dryness, or extreme heat? Depending on the reason, they might be absent or substantially less common in habitats like montane deserts or alpine areas (which can be similar to tundras).