Abstract
The carbonicolous discomycete, S. brunnea, formed ectomycorrhizae with jack pine (Pinus banksiana) in monoxenic cultures and in open containers. In addition, mycorrhizae were formed with species of Picea, Larix and Populus. The mycorrhizae were characterized by thin mantles and large diameter hyphal cells with Woronin bodies at the septa. S. brunnea is unusual as a mycorrhizal symbiont due to its taxonomic position, carbonicolous nature, rapid growth rate and ease of ascospore germination.