Abstract
This is the first study exclusively dedicated to the study of Hebeloma in Greenland. It is based on almost 400 collections, the great majority of which were collected by three of the co-authors over a period of 40 years and were lodged in the fungarium of the Natural History Museum in Copenhagen. The material was identified using molecular and morphological methods. In total, 28 species were recognized, 27 belonging to three sections, H. sects Hebeloma, Denudata and Velutipes. One species sampled was new to science and is here described as H. arcticum. For all species, a description, a distribution map within Greenland and macro and microphotographs are presented. A key is provided for the 28 species. The distribution of species within Greenland is discussed. The findings are placed in the context of studies of arctic and alpine Hebeloma from other parts of the world where comparable data exist. Notably, H. grandisporum, H. louiseae and H. islandicum, previously only known from Romania, Svalbard, Iceland or Norway, respectively, have been found in Greenland. The latter is also the only species encountered that does not belong to any of the above sections. Hebeloma excedens and H. colvinii – for the latter we here publish the first modern description – are to date only known from continental North America and now Greenland.
Highlights
Hebeloma are notoriously difficult to identify to species
This is the first study exclusively dedicated to the study of Hebeloma in Greenland. It is based on almost 400 collections, the great majority of which were collected by three of the co-authors over a period of 40 years and were lodged in the fungarium of the Natural History Museum in Copenhagen
H. arcticum, H. colvinii and H. excedens have not been recorded from Europe
Summary
The genus is very common in arctic habitats and plays an important role as a mycorrhizal symbiont in arctic scrubland for plants like Salix, Betula and Dryas and for the turnover of nutrients in these harsh environments In spite of their frequency and abundance in arctic areas, the alpha taxonomy of the genus was confused until the work of Beker and colleagues (Eberhardt et al 2015a, b, 2016; Beker et al 2016; Grilli et al 2016) who described a number of new species from Europe, including the arctic and alpine regions of Europe, and reappraised the delimitation of known taxa. We provide a review of Hebeloma spp. collected in Greenland and verified by molecular and morphological analysis. These encompass 378 of the 405 collection from Greenland that were digitized in the fungarium C of the Natural History Museum in Copenhagen, and represent 28 species. The material presented here is a part of the 15.000 collections for the funga
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