The genera "Helvella" and "Gyromitra" are similar. It was described as "Helvella californica" by W. Phillips in 1879. Helvella solitaria is a species of fungus in the family Helvellaceae. Helvella dryophila is a species of fungus in the family Helvellaceae. The species was first described scientifically by Julius Vincenz von Krombholz as "Helvella gigas". Helvella acetabulum is a species of fungus in the family Helvellaceae, order Pezizales. The species has also been referred to as "Macropodia nigrella", "Helvella nigrella", and "Macroscyphus nigrellus". Helvella latispora is a species of fungi in the family Helvellaceae of the order Pezizales. Helvella queletii is a species of fungi in the family Helvellaceae of the order Pezizales. Helvella is a genus of ascomycete fungus of the family Helvellaceae.