The Ricotia story published in Plant Journal - recurrent origin of a fusion chromosome!

The ancestral Ricotia genome was formed by a rare inter-clade hybridization event, followed by cladogenesis accompanied by three decreases in chromosome number (descending dysploidies). The last dysploidy was mediated by a unique chromosomal rearrangement, proving that structurally identical or similar fusion chromosomes may be formed in land plants from the same precursor chromosomes by different translocation mechanisms repeatedly after several million years.