Comparative anatomy of five species of Campyloneurum (Polypodiaceae) from South America

• Published in: Flora. Morphologie, Geobotanik, Oekophysiologie Geobotanik, Oekophysiologie, 2021-09, Vol.282, p.151881, Article 151881
• Main Authors: Jaimez, Dalma G., León, Blanca, Martínez, Olga G.
• Format: Article
• Language: English
• Subjects: Epiphytic fern; Hydathodes; Lamina; Nectaries; Petiole
• ISSN: 0367-2530; 1618-0585
• DOI: 10.1016/j.flora.2021.151881

•The epiphytic species of Campyloneurum have the largest number of layers in theinner cortex of the root.•In Campyloneurum the nectary presence on the petioles and lamines is frequent.•The meristelas number is a taxonomy character relevant for Campyloneurum. 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.