Aseomus

Aseomus is a genus of fungi belonging to the family Hymenogastraceae. The genus was first described in 2013 by molecular phylogenetic studies which revealed that certain species previously placed in other genera, such as Hymenogaster and Octaviana, represented distinct evolutionary lineages. The name Aseomus is derived from the Greek word "ase," meaning "bag," and "omphalos," meaning "navel," referring to the often navel-like appearance of the ascocarp.

Species within Aseomus are hypogeous, meaning they grow underground, and produce sporocarps, commonly known as truffles. These truffles are typically small to medium-sized, with a peridium (outer skin) that can range in texture and color depending on the species. The gleba (internal spore-bearing tissue) is often marbled with veins and can change color as it matures. The asci, which contain the spores, are typically globose to subglobose.

The ecological role of Aseomus is primarily as ectomycorrhizal symbionts, forming associations with the roots of various trees, particularly in Mediterranean ecosystems. These associations benefit the host plant by increasing nutrient and water uptake, while the fungus receives carbohydrates from the plant. The dispersal of Aseomus spores is often facilitated by animals that consume the truffles. Research into Aseomus is ongoing, with new species being discovered and their ecological relationships further elucidated.