Longest solo journey by fungal mycelium boat
- Who
- Sam Shoemaker
- What
- 42.43 kilometre(s)
- Where
- United States (Los Angeles)
- When
- 05 August 2025
Age Restriction: Applications for this record title will only be accepted if the applicant is 16 years of age or over.
The longest solo journey by fungal mycelium boat is 42.43 km (26.37 miles) and was achieved by Sam Shoemaker (USA) across the Catalina Channel in California, USA, on 5 August 2025.
The crossing took just over 12 hours.
The kayak was made from mushrooms - more specifically Ganoderma polychromum mycelium, which is the network of threads that support the growth of fungi and mushrooms.
Sam is an artist and mycologist cultivating rare, gourmet, medicinal, and native fungi in Los Angeles. He built the kayak cast from a single monolithic block of mycelium.