RESUMO:Morus nigra L., Moraceae, é uma espécie pertencente à família Moraceae, conhecida comumente como amoreira-preta. Na medicina popular é empregada nos casos de ondas de calor e até mesmo indicada como terapia de reposição hormonal. Possui atividade antioxidante, hipoglicemiante, antiinflamatória e antimicrobiana. O presente trabalho trata da caracterização estrutural da folha, de modo a contribuir na morfodiagnose para o controle de qualidade. Amostras do material vegetal foram seccionadas, fixadas e coradas com fucsina e toluidina. A folha apresenta estômatos anomocíticos na face abaxial, tricomas tectores, mesofilo bifacial, drusas, nervura central semi-convexa e o pecíolo exibe feixes vasculares em arco fechado.Unitermos: Amoreira-preta, Morus nigra, Moraceae, morfodiagnose.ABSTRACT: Morus nigra L., Moraceae, is a species usually known as a black mulberry tree. In traditional medicine, M. nigra is used in cases of heat waves and even suitable as a therapy of hormonal replacement. This specie has antioxidant, hypoglycemic, anti-inflammatory and antimicrobial activities. This work has dealt with the structural diagnosis of the leaf, in order to contribute to its quality control. Samples of the botanical material were sectioned, fixed and stained with fuchsine and toluidine. The leaf has anomocytic stomata on the abaxial side, non-glandular trichomes, biface mesophyll, druses, semiconvex midrib and the petiole exhibits a vascular bundle in a closed arch shape.
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