INVESTIGADORES
RAMOS GIACOSA Juan Pablo
artículos
Título:
Spore morphology and wall ultrastructure of Trachypteris species (Pteridaceae)
Autor/es:
RAMOS GIACOSA, J. P.; MORBELLI, M. A.; GIUDICE, G. E.
Revista:
PLANT SYSTEMATICS AND EVOLUTION
Editorial:
SPRINGER WIEN
Referencias:
Año: 2011 vol. 294 p. 227 - 237
ISSN:
0378-2697
Resumen:
Trachypteris is a small genus consisting of four
species native to America and Madagascar: Trachypteris
induta, T. pinnata, T. gilliana, and T. drakeana. The
spores of the genus were studied using light microscopy
and scanning and transmission electron microscopy. They
are trilete, triangular to globose, with equatorial diameter
of 29-58 um and polar diameter of 26-53 um. The exospore
is 0.5-1.1 um thick, plane, and two-layered. The
perispore is 0.3-6.8 um thick and two-layered. Depending
on the species, two different ornamentations were
observed: cristated with partially fused cristae, and ridged
with partially fused ridges, forming an incomplete reticulum.
Globules immersed in the perispore were occasionally
observed. The systematic value of the Trachypteris spores
is discussed, and their morphology and ultrastructure are
compared with those of other related cheilanthoid ferns.
The palynological characteristics presented here may be
useful for phylogenetic studies within the Pteridaceae, and
particularly within the cheilanthoid ferns.