Kalmar "Cortinarius violaceus" ita ce sunan kimiyya ga nau'in naman kaza da aka fi sani da violet webcap. "violaceus" yana nufin violet ko purple mai launi, wanda ke kwatanta hular naman kaza.Gaba ɗaya, namomin kaza na Cortinarius suna da alamar kasancewar wani ɗan lu'u-lu'u ko "cortina" wanda ke rufe gills lokacin da naman kaza. matashi ne, sannan yakan bar zobe mai kama da yanar gizo ko ragowar a kan tushe yayin da hular ta faɗaɗa. Cortinarius violaceus sananne ne don kyawunsa mai ban sha'awa da zurfin hula mai launin shuɗi, wanda zai iya kaiwa 15cm a diamita, kuma don ɗanɗanonsa mai ɗaci. Ana samun wannan naman kaza a cikin dazuzzukan dazuzzukan dazuzzuka a Turai da Arewacin Amurka, kuma ba a ba da shawarar a sha ba saboda yuwuwar kamuwa da cutar.