Which of the following statement(s) is/are correct about class basidiomycetes? (i) They are commonly known as imperfect fungi because only the asexual or vegetative phases of these fungi are known. (ii) They grow in soil, on logs and tree stumps and in living plant bodies as parasites, e. g., rusts and smuts. (iii) The mycelium is branched and septate. (iv) Some common members are Agaricus, Ustilago and Puccinia.