Quercus lusitanica, commonly known as Gall Oak, Lusitanian Oak, or Dyer's Oak, is a species of oak native to Morocco, Portugal, and Spain. Q. lusitanica is the source of commercial nutgalls. These galls are produced by the infection from the insect Cynips gallae tinctoriae. They are used for dyeing.
Other names for the galls are Turkish gall, Galla tinctoria, Galla halepense, Galla levantica or Galla quercina, manjakani in Asia Minor or majuphal in India. In Tamil it is called 'maasikkaay' and is used by Tamils for more than 2000 years.