Root anatomy of 37 species of Asplenium (Aspleniaceae) from Argentina: Contributions to the systematics and phylogeny of the genus

Characterizing Asplenium achalense (Aspleniaceae), a misunderstood species of Argentine flora: morphological, palynological and distributional evidences

“…Observations were made in a microscope FEI Quanta 200 model (Servicio de Microscopía Electrónica de Barrido y Microanálisis del LIMF, Facultad de Ingeniería, Universidad Nacional de La Plata) with a 15 kV voltage. For descriptions of the sculpture of the spore wall with SEM, as well as tha anatomy of the petiole and root, the works of Giudice et al (2002), Ganem et al (2019) and Luna et al (2020) were consulted. The microscopic slides used in this study are stored in the "Laboratorio de Anatomía Comparada, Propagación y Conservación de Embriofitas "Dr. Elías R. de la Sota", Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata.…”

“…Root anatomy. The root structure of A. achalense is described in detail in the work of Luna et al (2020). Briefly, the most relevant anatomical characteristic of Asplenium roots is the presence of "asplenium sclereids" in the inner cortex.…”

“…In the case of A. achalense, the inner cortex is made up by a single layer of six sclereids, which corresponds to the Aethiopicum root subtype described by Schneider (1997) and proposed later by Schneider et al (2004) as the synapomorphy of Asplenium section Sphenopteris Mett. (Luna et al, 2020).…”

Asplenium guodanum (Aspleniaceae), a distinct new fern species from northern Guangdong, China, based on morphological data and molecular phylogeny

“… Asplenium L. is one of two genera in the fern family Aspleniaceae , comprising more than 700 species worldwide ( Xu et al 2020 ). Members of the genus can be recognised by usually having erect rhizomes with radial steles, two C-shaped vascular bundles usually forming one X-shaped bundle at apex of the petiole, clathrate rhizome scales, distinctly sulcate rachises with a raised ridge in the centre and two grooves on each side, elongated sori normally located on one side of a vein ( Mitsuta et al 1980 ; Lin and Viane 2013 ; Luna et al 2020 ). It has a worldwide distribution and is native to almost all parts of the world, except Antarctica and some high Arctic areas ( Kramer and Viane 1990 ).…”