The name "iceberg" can also refer to a physical iceberg with a mushroom shape, but in the context of mushroom strains, it refers to this specific Psilocybe cubensis variety.
The "Iceberg" is a specific, rare albino strain of the Psilocybe cubensis magic mushroom, a mutation derived from the Thai Lipa Yai variety. It is known for its distinctive appearance and is typically available in grow kits for cultivation.
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There could not be a more appropriate name for Iceberg mushrooms. At maturity, the caps crack like a snowy iceberg. They are proliferate fruiters, often packing tubs wall to wall. This albino mutation comes from Thai Lipa Yai, a Thai landrace discovered in a small town called Lipa Yai by John W. Allen. Miss Mush So Cal Labs grew those Thai Lipa Yai and happened upon an albino fruit. That albino phenotype was isolated and is responsible for the genetics we now know as Iceberg.