Carex myosuroides (syn. Kobresia myosuroides), the mouse-tail bog sedge, is a species of sedge (family Cyperaceae) with a circumboreal distribution. It is the only known sedge to have ectomycorrhizal associations.
It is a known host to a number of fungi, including Anthracoidea elynae, Arthrinium puccinioides, Cladosporium herbarum, Clathrospora elynae, Lophodermium caricinum, Phaeosphaeria herpotrichoides, Schizonella melanogramma, Septoria punctoidea and possibly to Micropeziza cornea.Helgi Hallgrímsson & Guðríður Gyða Eyjólfsdóttir (2004). Íslenskt sveppatal I - smásveppir [Checklist of Icelandic Fungi I - Microfungi. Fjölrit Náttúrufræðistofnunar. Náttúrufræðistofnun Íslands [Icelandic Institute of Natural History]. ISSN 1027-832X
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