L arch trees, species of the genus Larix, are a group of deciduous conifers, all of which have been introduced to Britain. The most common species in Britain, Larix decidua, was first introduced in the 17th century. Japanese Larch, Larix kaempferi, which is located princi- pally in the west of England, Wales, and Scotland was later introduced in 1861. Larix x eurolepis a hybrid of L. decidua and L. kaempferi is also found throughout the UK, though L. decidua remains the dominant species by far. The Himalayan Larch, Larix griffithii also has some presence within the UK as evidenced by fungal collection databases. Currently the genus is under threat in the UK from the oomycete pathogen Phytophthora ramorum, perhaps better known to readers as the cause of Sudden Oak Death. Infection is predominantly seen in Japanese Larch (Forestry Commission, 2017a) though has also been observed in European Larch and Hybrid Larch (Forestry Commission, 2017b). A number of woodland reserves are now stripping out infected larches or trees under threat of infection. The potential decline of larch in the UK may have many downstream effects on UK ecology and the mycological landscape. It is important therefore to compile an understanding of the UK fungal species dependent on larch to aid in their conser- vation. For the less ecologically concerned reader, host identification is often an important discrimi- nator between species. Here is presented a review of some of the known larch-associated species in the UK. Previously a summary of larch-associated ectomycorrhizal fungi in Poland has been produced for L. decidua (Leski & Rudawska, 2012). Additionally, the variation of species of ectomycorrhizal fungi associated with L. laricina across different temperatures has been investi- gated through artificially-created ectomycor- rhizal associations (Samson and Fortin, 1986). However, to the author’s knowledge no general formal summary of the fungi associated with all larch species in the UK has been published. In addition to a comprehensive literature review, the Herbtrack and HerbIMI databases were used to compile a list of digitised recordings of collec- tions in the UK associated with Larix. This methodology provided a comprehensive source of a wide range of observations with physical records, allowing a broad analysis of associated fungal species. The Herbtrack and HerbIMI databases, which represent the digitally recorded collections of the Royal Botanic Gardens, Kew, and the former International Mycological Institute, contained 311 observations of fungi identified to at least genus level in association with larch in the United Kingdom and the Isle of Man. These observations represent 158 identified species distributed across 127 genera, with two species having multiple identified variants. The FRDBI, at the point of writing, contains records for 1006 species, including variants, recorded as associated with larch. These species are distributed within 60 families and 422 genera, with records included for the Basidiomycota, Ascomycota, and Zygomycota. There are 1189 records for Basidiomycota for a total of 755 species across 233 genera and 21 families. There are 371 records for Ascomycota (including one misattributed record for Lachnellula wilkomii within the Basidiomycota) for a total of 244 species across 184 genera and 31 families. Finally, the Zygomycota consist of 7 records totalling 7 species distributed across 5 genera and 5 families. Mycena was both the most recorded genus and also the genus with the great- est observed species diversity. Thus the combined records of Herbtrack and HerbIMI contain just over 15% of the species said to have been found associated with larch within the UK and gives a different representation of species diversity. This review aims to strike a balance between the more common species associated with larch and rarer, perhaps more interesting finds. I focus primarily on species with limited host distribu- tions that include larch. However, the reader British larch-associated Basidiomycota : a review doi:10.1016/j.fldmyc.2017.07.010