Geobacillus stearothermophilus
Geobacillus thermoglucosidasius
Geobacillus toebii
(tree size 1)
Geobacillus jurassicus
Geobacillus kaustophilus
(tree size 1)
Geobacillus thermodenitrificans
(tree size 3)
Geobacillus caldoxylosilyticus
Geobacillus galactosidasius
Geobacillus icigianus
Geobacillus lituanicus
Geobacillus subterraneus
(tree size 2)
Geobacillus thermantarcticus
Geobacillus thermocatenulatus
Geobacillus thermoleovorans
Geobacillus uzenensis
Geobacillus vulcani
Geobacillus zalihae
Geobacillus debilis
Geobacillus gargensis
Geobacillus pallidus
Geobacillus tepidamans
Geobacillus yumthangensis