&lt;i&gt;Sarcosoma globosum&lt;/i&gt; (witches cauldron) is a threatened species of pezizomycete (Ascomycete) fungus primarily documented in spruce (&lt;i&gt;Picea&lt;/i&gt; spp.) forests of northern Europe. Sporadic reports of &lt;i&gt;S. globosum&lt;/i&gt; have been reported in eastern North America, but it has been suggested that these may have been misidentified. Importantly, the species has not been officially reported in western North America. Following reported observations of &lt;i&gt;S. globosum&lt;/i&gt; in British Columbia, Canada, we conducted a citizen science survey to document its distribution and occurrence over four consecutive years (2021–2024). Firstly, we verified that sporocarps collected in eastern (New Brunswick) and western (British Columbia) Canada were &lt;i&gt;S. globosum&lt;/i&gt; via the morphological, ecological, and phylogenetic (analysis of the ITS gene) species concepts. Secondly, &lt;i&gt;S. globosum&lt;/i&gt; was documented in all four years of the survey over a wide geographical area in British Columbia. Finally, we mapped the Canadian distribution of &lt;i&gt;S. globosum&lt;/i&gt; based on publicly available databases. The species appears to be found across Canada (British Columbia to Nova Scotia), where spruce-dominated forests are present, supporting the current Canadian national conservation status of ‘Apparently Secure/Secure’ (N4, N5). However, its habitat remains threatened by climate change, forest fires, and logging activities that may limit its future geographical distribution. This study presents the first documented occurrence of &lt;i&gt;S. globosum&lt;/i&gt; in British Columbia, expanding the species’ known distribution to western Canada.

Michael D. Preston

Angus P. Ball

Trevor Schibli

Kyran D. Gillman

Timothy J. Philpott

Alfredo Justo

Acta Mycologica

Acta Mycologica is an international, peer-reviewed, open access journal that publishes original research articles as well as review articles and short communications in all areas of mycology, including fungus-like organisms (slime moulds, yeasts, lichens, oomycetes, etc.), with respect to various ecosystems. Specifically, the journal covers:    ecology, taxonomy, conservation, and systematics of fungi,  fungal physiology, biochemistry, molecular genetics,  fungus–plant (pathogens, mycorrhizas, endophytes), fungus–animal, and fungus–microbe interactions  applied aspects of mycology in forestry, agriculture, and biotechnology.  Reviews of books related to mycology and in memoriam are also welcome.

Acta Mycologica is an international, peer-reviewed, open access journal that publishes original research articles, review articles, and short communications in all areas of mycology, including fungus-like organisms (such as slime molds, yeasts, lichens, oomycetes, etc.) across various ecosystems. Specifically, the journal covers: ecology, taxonomy, conservation, and systematics of fungi; fungal physiology, biochemistry, and molecular genetics; interactions between fungi and plants (including pathogens, mycorrhizas, and endophytes), fungi and animals, and fungi and microbes; as well as applied aspects of mycology in forestry, agriculture, and biotechnology. Reviews of books related to mycology and in memoriam articles are also welcome.

《Acta Mycologica》是一本国际性的、经过同行评审的开放获取期刊，专注于真菌学领域的原创研究文章、综述文章和简短通讯。期刊涵盖了包括真菌类生物（如粘菌、酵母、地衣、卵菌等）在内的各个方面，关注不同生态系统中的相关研究。具体而言，期刊内容包括：真菌的生态学、分类学、保护学和系统学；真菌生理学、生物化学、分子遗传学；真菌与植物（病原体、菌根、内生菌）、真菌与动物以及真菌与微生物之间的相互作用；以及真菌学在林业、农业和生物技术中的应用。此外，我们也欢迎与真菌学相关的书籍评审和纪念文章。

Expanded geographical distribution of <i>Sarcosoma globosum</i> (witches cauldron) in Canada.

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