Fig. 2.

The evolutionary path leading to Streptomyces. The diagram was derived from the phylogenetic tree in Fig. 2 of Gao & Gupta (2012), and the boxes correspond in colour to those used in Fig 3. Nodes 1 to 9 are reference points for the main text. Arrow lengths are not proportional to phylogenetic difference. Micrococcales genera showing a simple mycelium are indicated by asterisks, and sporulating mycelial genera are given in bold type. The approximate evolutionary timescale is based on Battistuzzi et al. (2004).