Wild magic mushrooms in Florida: what Fiske v. State really decided

The short answer

No. Wild mushrooms that contain psilocybin are illegal to pick, carry or keep in Florida. Florida's Schedule I covers "any material, compound, mixture, or preparation that contains any quantity" of psilocybin or psilocyn, and nothing in the law sets aside mushrooms found in nature.¹ Possessing them is a third-degree felony under Fla. Stat. 893.13(6)(a).²

Fiske v. State, the 1978 Florida Supreme Court case that online posts cite as proof that wild mushrooms are legal, doesn't say that. It reversed one conviction, 4-3, because, as applied to that defendant, the law gave no fair warning that the mushrooms he had were illegal, and his statement to officers was too ambiguous to show he knew. The same opinion says there is "no vagueness problem with the statute on its face."³

This page covers law and safety only. It gives no identification features, habitats, seasons or places, on purpose. If someone has eaten a wild mushroom, call Poison Control at 1-800-222-1222 now, even if the person seems fine.⁴

What did Fiske v. State decide?

The case started in Collier County. According to the opinion, a man was arrested with "a bag of wild mushrooms" found near him, a chemist found psilocybin in them, and a jury convicted him of possession, a third-degree felony. He appealed to the Florida Supreme Court, which ruled on December 21, 1978.³

The question was whether the conviction violated due process. "We hold that it does," Justice Boyd wrote for a 4-3 majority (Chief Justice England and Justices Overton and Sundberg dissented without a written opinion). "The statute makes no mention of psilocybic mushrooms or, for that matter, of any other psilocybic organic form that grows wild," the court said, so "It does not give fair warning that possession of the mushrooms possessed by appellant is a crime."³

The limits most summaries leave out

• The statute itself stood. "There is no vagueness problem with the statute on its face. It explicitly controls any material which contains psilocybin and makes possession of the material a felony." In "capsule, pill or similar form," the court added, it "may be applied constitutionally."
• Naming the mushrooms would cure it. If the statute named mushrooms known to contain psilocybin, "it would not be unconstitutional as applied."
• The facts mattered. The court called the defendant's statement to officers "ambiguous and susceptible of innocent explanation as well as being indicative of criminal knowledge," and said "Ambiguities in criminal proceedings are resolved in favor of the accused."

The holding itself is narrow: "The statute is held to have been applied unconstitutionally in this case."³

How have later courts treated Fiske?

In Florida, the only appellate decisions we found that rely on Fiske's holding are two one-line per curiam decisions from the Fourth District Court of Appeal in 1996, which state no facts: "Affirmed based on the authority of Fiske v. State" and "Affirmed. See Fiske v. State." Neither states any facts.⁵ Our search covered published Florida opinions through about 2018 in the Caselaw Access Project; we couldn't check later ones the same way.

Other states' courts read Fiske as a case about a defendant who wasn't shown to know what he had. The Iowa Supreme Court in 1997 quoted the Kansas Court of Appeals: "Of controlling importance in the Florida court's decision was the complete absence of any evidence that defendant knew that the mushrooms in his possession contained psilocybin. The court did not strike down the statute itself as unconstitutional but held that it could not be applied to a defendant who was not shown to have criminal knowledge." Iowa found Fiske's analysis "non-persuasive in the case before us where the defendant's knowledge is established."⁶

The Indiana Court of Appeals in 1995 noted that "at the time of Fiske's case, the Florida statute proscribing possession of any material containing psilocybin did not require scienter as an element of the crime," and that Fiske involved "a complete absence of evidence that the defendant knew."⁷ Those courts don't bind Florida, but they show how judges elsewhere read the case.

Does Fiske make picking wild mushrooms legal today?

No. The wording gap Fiske described is still there: Florida's 2026 Schedule I lists "33. Psilocybin." and "34. Psilocyn." as chemicals and names no mushroom, though the same list names peyote and Salvia divinorum.¹ But the law around it has changed.

Knowledge is now a defense, not an element

In 2002 the Legislature enacted Fla. Stat. 893.101. It says knowledge of a substance's illicit nature "is not an element of any offense under this chapter" and that "Lack of knowledge of the illicit nature of a controlled substance is an affirmative defense." When a defendant raises that defense, possession "shall give rise to a permissive presumption that the possessor knew of the illicit nature of the substance."⁸ In 2012 the Florida Supreme Court rejected a facial due process challenge to this, holding that "the Legislature did not violate due process by defining lack of such knowledge as an affirmative defense."⁹

That 2012 opinion doesn't mention Fiske, and we found no Florida decision saying how the two fit together. Nobody can promise a wild-mushroom case would end the way Fiske's did.

A trial argument, not a permission slip

At its strongest, Fiske is something a defense lawyer argues after an arrest and a felony charge. Someone who goes looking for psilocybin mushrooms knows what they're looking for, and that kind of knowledge is what courts in Kansas, Indiana and Iowa treated as decisive.⁶⁷ Our penalties guide explains what a third-degree felony charge can mean.

Is it trespassing to enter fenced or posted land?

Usually, yes, without the owner's permission. Under Fla. Stat. 810.09(1)(a)1., it's trespass to enter or stay on property without being "authorized, licensed, or invited" when notice is given "either by actual communication to the offender or by posting, fencing, or cultivation as described in s. 810.011." The base offense is a first-degree misdemeanor.¹⁰

Under 810.011, posted land has "no trespassing" signs with the owner's name in letters at least 2 inches tall, no more than 500 feet apart and at the corners, or "No Trespassing" notices painted in international orange on trees or posts, backed by such signs where people usually enter. Fenced land is enclosed by "a fence of substantial construction" at least 3 feet high. Cultivated land has been "cleared of its natural vegetation" and planted. All three "shall be considered as enclosed and posted."¹¹ Unauthorized entry onto such land "shall be prima facie evidence of the intention of such person to commit an act of trespass" (810.12(1)).¹²

Some trespasses are third-degree felonies: trespassing while armed, on legally posted commercial horticulture property, or "with the intent to commit a crime on commercial agricultural property" posted with the statute's felony warning (810.09(2)(b), (d) and (j)).¹⁰ A trespass charge is separate from any drug charge, and permission to be on land doesn't make picking or keeping psilocybin mushrooms legal.

Why are wild mushrooms a poisoning risk?

Because the wrong mushroom can kill. The National Institute on Drug Abuse warns of "the risk of misidentifying mushrooms and taking a toxic mushroom instead of one containing psilocybin."¹³ A CDC report published May 28, 2026 said "Poisonous mushrooms often resemble and are difficult to distinguish visually from nonpoisonous, edible mushrooms," and that amatoxins "can lead to liver failure and death when ingested."¹⁴

That report counted 39 suspected amatoxin poisonings in Northern California between November 18, 2025 and March 17, 2026: 3 people needed liver transplants and 4 died. The cases showed "a pattern of delayed onset" of stomach symptoms and liver damage, so feeling fine at first proves nothing.¹⁴ That's why we publish no identification tips, photos, habitats or seasons.

If someone ate a wild mushroom

• Call Poison Control at 1-800-222-1222 right away. Florida's poison control centers answer 24 hours a day, 7 days a week, in English and Spanish, and the specialists are doctors, nurses and pharmacists.⁴
• Call 911 now if the person collapses, has a seizure, has trouble breathing or can't be woken.¹⁵
• For crisis lines and what Florida's 911 Good Samaritan law covers, see our help page.