I was reading about different levels of selection in Ridley's Evolution textbook (chapter on units of evolution) and saw that some organisms e.g. carrots are not Weismannist i.e. don't have separate somatic and germ lines and can make offspring with their somatic cells, and that this can in theory lead to cell-level selection because cell lines that outcompete others have a greater chance of leading to offspring and thus will be selected for. I think mutation that arises in a cell during the organism's lifetime and causes it to proliferate counts as an acquired mutation, but I've also read a lot that acquired mutations/characters aren't passed on a la Lamarck.
Is this a case where acquired mutations are passed on, and how does that fit with the usual concept that acquired characters aren't passed on? I know gene, individual, and kin selection are much more prevalent and Ridley says the cell-line selection idea is just theoretical, but what would this mean if it occurred?