Unweighted pair-group method with arithmetic mean (UPGMA) phenogram resulting from cluster analysis. Explanations: Ar-Huernia arabica, La- H. laevis, Kh- H. khalidbinsultanii, Ra- H. radhwana, An- H. anagaynensis, As- H. asirensis, Ru- H. rubrosticta, Fo- H. foetida, Lo- H. lodarensis, Bo- H. boleana, Sa- H. saudi-arabica, Co- H. collenetteae.