Figure 25

Evolution of Conjugales, from Valentine J. Chapman and David J. Chapman, The Algae (1973:334). This figure is representative of evolutionary tree-diagrams in the phycological literature from the late 1800s through the late 1900s in depicting parallel morphoclines of (usually) increasing complexity along which extant species can give rise to others. Macmillan and Co. Ltd, reproduced with permission of Palgrave Macmillan.