Shelf mushroom variants / Mushroom generation

The shelf mushroom on it's own is already a big change for environments, so why not add a variant that resembles it's concept art for the birch forests, which are smaller mushrooms from 1 - 4 clusters, similar to the wildflower. they can drop normal brown mushrooms as it is depending on the cluster, you can place brown mushrooms on any wall which is easy to access & farm yet it would make mushrooms more accessible, would also benefit builders a ton. related to the current shelf mushroom, it should spawn more frequently in pre-existing biomes such as forests and it's counterparts, spruces and especially birch forests, along with caves.