Similar to Trichoglossum hirsutum but the ascospores have variable numbers of septa; (7-) 9-11 (-13) rather than the 13-15 septate spores found in T. hirsutum.
Not formally assessed, but the species as currently circumscribed is rarely encountered. In common with other earthtoungues, it is almost certainly threatened due to nitrification of its habitat.
The species is dubiously distinct from T. hirsutum; apart from the spore septation there are no other diagnostic morphological features, and both species have slightly swollen recurved paraphysis tips. The material examined (from grassland in VC63 SW Yorkshire) has ascospores (114-) 121-138 (-153) µm in length, distinctly longer than material from Slovakia and Turkey (Kučera et al. 2008; Güngör et al. 2015); those may refer to different species. Molecular data are needed.
Scattered throughout Great Britain; reported from VC2 E Cornwall, VC16 W Kent, VC52 Anglesey, VC57 Derbyshire, VC63 MW Yorkshire and VC108 W Sutherland.
In grassland soil, dune slacks and boggy ground.