The Hypoviridae, comprising one genus, Hypovirus, is a family of capsidless viruses with positive-sense, ssRNA genomes of 9.1-12.7 kb that possess either a single large ORF or two ORFs. The ORFs appear to be translated from genomic RNA by non-canonical mechanisms, i.e. internal ribosome entry site-mediated and stop/restart translation. Hypoviruses have been detected in ascomycetous or basidiomycetous filamentous fungi, and are considered to be replicated in host Golgi-derived, lipid vesicles that contain their dsRNA as a replicative form. Some hypoviruses induce hypovirulence to host fungi, while others do not. This is a summary of the current ICTV report on the taxonomy of the Hypoviridae, which is available at www.ictv.global/report/hypoviridae.

Department of Agricultural Biotechnology and College of Agriculture and Life Sciences Seoul National University Seoul 08826 Republic of Korea

Department of Agronomy Horticulture and Plant Science South Dakota State University Brookings SD 57007 USA

Department of Biology and Microbiology South Dakota State University Brookings SD 57007 USA

Department of Plant Biology and Pathology Rutgers University New Brunswick NJ 08901 USA

Department of Plant Virology Institute of Plant Molecular Biology Biology Centre of the Czech Academy of Sciences v v i Branišovská 31 370 05 České Budějovice Czech Republic

Division of Apple Research Institute of Fruit Tree and Tea Science National Agriculture and Food Research Organization Morioka Japan

Institute of Plant Science and Resources Okayama University Kurashiki Okayama 710 0046 Japan

Plant Pathology Department College of Plant Science and Technology Huazhong Agricultural University Wuhan 430070 Hubei Province PR China

Plant Pathology Department University of Kentucky Lexington KY 40504 USA

School of Biological Sciences The University of Auckland Private Bag 92019 Auckland New Zealand

State Key Laboratory for Biology of Plant Disease and Insect Pests Institute of Plant Protection Chinese Academy of Agricultural Sciences Beijing 100193 PR China

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