Anatomical characters of the sporophyte of five Campyloneurum species are presented: C. aglaolepis, C. angustifolium, C. angustipaletum, C. lorentzii, and C. tucumanense, to evaluate anatomical characters with a taxonomic value. Histological sections of the root, rhizome, and petiole were made in three sections (basal, middle, and distal) and lamina, using specimens of herbarium and material collected for this purpose. Observations were made with a light microscope and a scanning electron microscope. The anatomical characters, such as the type of helical thickening in parenchymal cells in outer cortex and the number of layers in the inner cortex of the root; diameter, presence of prurine, number of meristeles and sclereid nests in the rhizome; adaxial groove and the number of vascular bundles in the petiole; and mesophyll, stomata and hairs types in the lamina, shows a highly significant in taxonomic value for the separation between the five studied species. For the first time, hydathodes, nectaries, diacytic stomatal types and homogeneous mesophyll are described in Campyloneurum, and the anatomy of C. tucumanense is presented.

展示了五种弯曲菌属的孢子体的解剖特征：C. aglaolepis、C. angustifolium、C. angustipaletum、C. lorentzii和C. tucumanense，以评估具有分类学价值的解剖特征。根、根茎和叶柄的组织切片分为三个部分（基部、中部和远端）和叶片，使用为此目的收集的植物标本和材料。用光学显微镜和扫描电子显微镜进行观察。解剖学特征，如外皮层实质细胞螺旋增厚的类型和根内皮层的层数；直径、是否存在紫薯、根茎中分生组织和硬核的数量；叶柄中的正轴沟和维管束的数量；叶片中的叶肉、气孔和毛发类型在五个研究物种之间的分离中显示出非常显着的分类学价值。第一次，水螅、蜜腺、Campyloneurum和C. tucumanense的解剖结构。