Closeup of roots with AM fungal hyphae (image) Boyce Thompson Institute Share Print E-Mail Caption Arbuscular mycorrhizal fungi extend long filament-like structures called hyphae far out into the soil. The hyphae, which are smaller than a human hair, can be seen here among the roots of a grass plant. Credit Maria Harrison Usage Restrictions Please give proper credit Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.