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Kenkou Cross is the author of Monster Girl Encyclopedia (Volumes One and Two), which is beloved by filthy degenerates worldwide. The books present an unexpectedly detailed example of world building, mostly in the form of entries for various “monster girls”. These books are widely available, both in the original Japanese and translated into English:

• Monster Girl Encyclopedia (Vol 1)
• Monster Girl Encyclopedia (Vol 2)

His examples of “mushroom girls” are not explicitly based on real-world mushrooms, but the “Matango” monster girl is clearly based on the iconic Amanita Muscaria toadstool.

These are two Japanese artbooks by Emi Tamaki (玉木 えみ) , where she personifies different species of mushrooms as cute anime girls. I order the books through Japanese Amazon here:

• Mushroom Girl Book

• Mushroom Girl Book 2: “Proliferation”