Fungal protein materials look like wood grain but act like smooth plastic when pulled apart.
April 20, 2026
Original Paper
When structure does not imply symmetry
arXiv · 2604.15682
The Takeaway
Fungal protein structures often look like they have a specific grain or directionality at the microscopic level. Most engineers assume that a directional internal structure always leads to directional physical properties like strength or flexibility. This investigation shows that these fungal networks can actually cancel out their own internal orientation to act the same way from every angle. The mere presence of a pattern inside a biological material does not guarantee how it will respond to stress. Manufacturers could use these principles to grow bio-materials that look complex but provide consistent stability in every direction. This discovery helps explain why natural materials are often more resilient than their synthetic counterparts.
From the abstract
Fungal protein materials exhibit inherently anisotropic microstructures formed by networks of hyphae, which suggest a natural pathway to replicate the fibrous texture of animal meat. We probe whether this structural anisotropy translates into macroscopic mechanical and sensory anisotropy. Using orthogonal tension, compression, and shear experiments on three fungi-based materials, we identify distinct symmetry classes that range from strongly anisotropic to effectively isotropic behavior. Automat