Mushroom Pokémon are a group of usually Grass-Type Pokémon that, as the name suggests, present several characters correlated to mushrooms. Species in this very small group more often than not show a large mushroom cap on top of their head and the ability to produce and disperse spores (a character also seen in some Plant Pokémon, but considered today an example of convergent evolution).
This group was traditionally classified as an offshoot of the Plant Pokémon due to several similarities, but modern genetic analysis and techniques have revealed a very close relationship with the Sprite Pokémon, a group including Wigglytuff (Jigglypum balloonis) and Clefable (Clefairis moonibondia).
Recently, an extinct species previously considered the ancestor to all Plant Pokémon named Sporely (Podlium sporebondia) was reanalyzed. The discovery of new material, and microscopy scanning of new and old material, revealed a stunning discovery: this was the most ancient Mushroom Pokémon ever found. This furthers strengthened the connection with Sprite Pokémon, and even suggests the ancestor to the three groups (Mushroom Pokémon, Plant Pokémon and Sprite Pokémon) might have looked closer to Mew (Meus originus) than previously thought.
Miceliong (Sporelis longitailia) was a species of Mushroom Pokémon with a large mushroom cap on top of its head not dissimilar to other species of the group. It was found with several traces of spores fossilized within the rock, suggesting it could also produce spores much like its fellow Mushroom Pokémon, and the anatomy of its final ontological evolution stage shows a more developed body than most Mushroom Pokémon, placing it at the very base of the Mushroom Pokémon evolution branch.
by GebF