Palynological analysis of the genus Ctenitis (C. Chr.) C. Chr. (Dryopteridaceae) in the Southern Cone of America

DANIEL ALEJANDRO GORRER; JUAN PABLO RAMOS GIACOSA; GABRIELA ELENA GIUDICE

ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS.

ACAD BRASILEIRA DE CIENCIAS

Lugar: Rio de Janeiro; Año: 2022

0001-3765

The spore morphology and wall ultrastructure of 12 species of Ctenitis fromSouthern Cone of America were studied using light microscope, scanning and transmissionelectron microscope. The study was carried out with herbarium material from Argentineand Brazilian institutions. Equatorial diameters, polar diameters and laesura lengthwere measured. The spores are monolete with echinate or folded ornamentation. In theechinate type, the spines are conical, with broad base and attenuate apex. In the rugatetype, the folds are inflated, linear, sinuous, subglobose or handle-shape. The perisporesurface is scabrate, rugulate, microverrucose or psilate. Stratification and ultrastructurein the species analyzed are very similar. The exospore is smooth and two-layered insection. Simple and branched channels are observed mainly in the outer exospore. Theperispore is composed of two layers, the inner one forms the ornamentation and theouter covers all the outer and inner surfaces. Immature spores were found in all samplesof C. fenestralis. The characteristics of the studied spores like macro-ornamentation,color and fold length provide relevant information to differentiate some species orgroups of species within the genus.