Viscum album originally described by Linnaeus. Its species name is the Latin adjective "albus" "white". It and the other members of the genus "Viscum" were originally classified in the mistletoe family Viscaceae, but this family has since been sunk into the larger family Santalaceae. Several subspecies are commonly accepted. They differ in fruit colour, leaf shape and size, and most obviously in the host trees utilised. European mistletoe is potentially fatal, in a concentrated form, and people can become seriously ill from eating the berries. The toxic lectin viscumin has been isolated from "Viscum album". Viscumin is a cytotoxic protein (ribosome inactivating
What Is and What Should Never Be and What Should Never Be" was performed live at Led Zeppelin concerts between 1969 and 1973. A live version taken from a performance at the Royal Albert Hall in 1970 can be seen on the "Led Zeppelin DVD". Another was included on disc two of the live triple album "How The West Was Won". Two more versions were included in BBC Sessions. What Is and What Should Never Be "What Is and What Should Never Be" is a song by English rock band Led Zeppelin. It was written by Jimmy Page and Robert Plant and was included as the second