The Fungi from Yuggoth
| Publisher | Chaosium, Inc. |
| Editor | Sandy Petersen |
| Artist | Chris Marrinan |
| Layout by/Layout Coordinator | Tadashi Ehara |
| Format | Soft cover |
| Language | English |
| Location | Albany, CA |
| Copyright | 1984 |
| Pages / Font | 75 pages |
| ISBN | 0-933635-08-7 |
| Catalog Number | Chaosium publication 2305 |
| Chapters | Introduction: The Prophecy Plot Synopsis: The Brotherhood of the Beast Chapter I: The Dreamer Chapter II: The Thing in the Well Chapter III: Castle Dark Chapter IV: Sands of Time Chapter V: Mountains of the Moon Chapter VI: By the Bay: Part I Chapter VII: By the Bay: Part II Chapter VIII: Day of the Beast Conclusion: Foiling the Brotherhood Optional Scene 1: Halls of Celaeno Optional Scene 2: Voice Out of Time |
| Notes | A supplement for Call of Cthulhu roleplaying game. Second printing in 1987 with same catalogue number, slightly altered cover. Reprinted in the anthology Curse of Cthulhu (1990, Chaosium publication 3306). Revised as Day Of The Beast (1998, Chaosium publication 2374 ). |
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