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Wikipedia: An oak is a tree or shrub in the genus Quercus, of which about 600 species exist on earth. "Oak" may also appear in the names of species in related genera, notably Lithocarpus. The genus is native to the northern hemisphere, and includes deciduous and evergreen species extending from cold latitudes to tropical Asia and the Americas.
![[Population of Quercus frainetto and Quercus pubescens species in the Foloi oak forest in southwestern Greece]](http://images.ookaboo.com/photo/s/Foloi_oak_forest_s.jpg "Population of Quercus frainetto and Quercus pubescens species in the Foloi oak forest in southwestern Greece")
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![[[[Quercus virginiana]](http://images.ookaboo.com/photo/s/Spanish_moss_tree_s.jpg "[[Quercus virginiana")
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 from Huskarl |
 from Phr |
![[Mongolian Oak]](http://images.ookaboo.com/photo/s/Quercus_mongolica_mongolian_oak_MN_2007_s.jpg "Mongolian Oak")
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![[Mustard Powder lichen on Sycamore bark at Eglinton Country Park in North Ayrshire, Scotland]](http://images.ookaboo.com/photo/s/Mustard_Powder_Lichen_s.jpg "Mustard Powder lichen on Sycamore bark at Eglinton Country Park in North Ayrshire, Scotland")
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from SEWilco |
from Rosser1954 |
![[The « Les Sept Frères de Gospinal » pedunculate oak of [[:w:Jalhay]](http://images.ookaboo.com/photo/s/Solwaster_AR1bJPG_s.jpg "The « Les Sept Frères de Gospinal » pedunculate oak of [[:w:Jalhay")
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![[Oak powdery mildew on pedunculate oak]](http://images.ookaboo.com/photo/s/Oak_Mildew_s.jpg "Oak powdery mildew on pedunculate oak")
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from Rosser1954 |
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![[The Duke Prosper Oak in Enghien (Belgium).]](http://images.ookaboo.com/photo/s/Quercus_robur_JPG_28d2_29_s.jpg "The Duke Prosper Oak in Enghien (Belgium).")
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![[Angel Oak on Johns Island, South Carolina.]](http://images.ookaboo.com/photo/s/Angel_Oak_Johns_Island_SC_horz_s.jpg "Angel Oak on Johns Island, South Carolina.")
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from Gsmith |
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![[A cross section of the trunk of a cork oak, Quercus suber]](http://images.ookaboo.com/photo/s/Cork_oak_trunk_section_s.jpg "A cross section of the trunk of a cork oak, Quercus suber")
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![[Old oak in Liernu, Belgium.]](http://images.ookaboo.com/photo/s/Quercus_robur_JPG_28a_29_s.jpg "Old oak in Liernu, Belgium.")
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from :en:Plantsurfer |
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![[Old oak tree in autumn colors from Vitosha]](http://images.ookaboo.com/photo/s/Old_oak_s.jpg "Old oak tree in autumn colors from Vitosha")
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![[Quercus petraea Sessile Oak in Sivry-Rance (Belgium).]](http://images.ookaboo.com/photo/s/Sivry_Rance_AR1aJPG_s.jpg "Quercus petraea Sessile Oak in Sivry-Rance (Belgium).")
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from Edal |
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![[Heart of oak beams of the frame of Saint-Girons church in Monein, France]](http://images.ookaboo.com/photo/s/Charpente_eglise_Saint_Girons_Monein_s.jpg "Heart of oak beams of the frame of Saint-Girons church in Monein, France")
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from Myrabella |
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