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Presumed domatia are actually extrafloral nectaries on leaves of Anacardium humile (Anacardiaceae), a species from the Brazilian savannah, is associated with foraging ants, which leads to the description of the structure of its leaves as domatia. However, the ants collect secretions on the leaves, a phenomenon that inspired us to elucidate this structure. To this end, we conducted an analysis of the distribution, micromorphology, anatomy and histochemistry of these supposed domatia. They are located in the axil of thicker leaf veins and are composed of glandular trichomes which exude glucose; they are, therefore, described here as extrafloral nectaries (EFNs). The nectariferous trichomes are located at the same level as the other epidermal cells on young leaves, while in mature leaves they were found in depressions of the leaf blade. The secretory activity of EFNs is limited to juvenile phases, becoming degenerated in mature leaves. Carbohydrates and lipophilic compounds were detected in the produced secretion. It can be concluded that the presence of ants foraging leaves to collect from EFNs indicates a mutualistic interaction, with the plant providing a sugar resource to the ants in return for protection against herbivory since they are present in developing leaves. Key words: Cashew, extrafloral nectary, glandular trichomes, histochemistry, nectar. Resumo Supostas domacias foliares de Anacardium humile (Anacardiaceae) sao na realidade nectarios extraflorais – Anacardium humile, uma especie do cerrado brasileiro, esta associada a formigas forrageadoras, o que leva a descricao da estrutura presente em suas folhas como domacias. No entanto, as formigas coletam a secrecao das folhas, um fenomeno que inspirou este estudo, que visa justamente elucidar esta estrutura. Por esta razao, foi realizada uma analise da distribuicao, micromorfologia, anatomia e histoquimica das supostas domacias. Elas estao localizadas nas axilas das nervuras foliares de maior calibre e sao compostas por tricomas glandulares. Os tricomas exsudam glicose, portanto, sao descritos aqui como nectarios extraflorais (NEFs). Os tricomas nectariferos estao localizados no mesmo nivel que as celulas da epiderme em folhas jovens, enquanto, nas folhas maduras, foram encontradas nas depressoes da lâmina foliar. A atividade secretora nos NEFs e limitada a fases juvenis, degenerando em folhas maduras. Carboidratos e substâncias lipofilicas foram detectados na secrecao produzida. Pode-se concluir que a presenca de formigas forrageando folhas para coleta nos NEFs indica uma interacao mutualistica, com a planta fornecendo recursos para as formigas em troca de protecao contra herbivoria, uma vez que as mesmas estao presentes em folhas ainda em desenvolvimento. Palavras-chave: Caju, nectario extrafloral, tricomas glandulares, histoquimica, nectar.