Resumo

Morfología y ultraestructura de las esporas de NephrolepIs cordifolIa (DavallIaceae) del Noroeste de Argentina. Bol. Soc. Argent. Bot. [online]. 2012, vol.47, n.1-2, pp.71-75. ISSN 1851-2372.

Spore morphology and wall ultrastructure in Nephrolepis cordifolia (Davalliaceae) from North-West Argentina. The family Davalliaceae is represented in the study area by the genus Nephrolepis, with only one species N. cordifolia. The study was based on herbarium and fresh material and the spores were studied under light microscope, scanning electron microscope and transmission electron microscope. The spores are monolete, the shape in polar view is ellipsoidal, and have a rugate surface, 20 µm in polar diameter (mean), 35 µm in mayor equatorial diameter (mean). Mature spores have a sporoderm composed of exospores and perispore. The exospore is two-layered, 1,3 to 2,6 µm thick, verrucate. The perispore is two layered, 920 nm to 2,75 µm thick, with verrucae and tubercles. The spores of Davalliaceae show some similarities with the spores of Microgramma, Pecluma y Polypodium (Polypodiaceae), referred to spore type, but differ from the last ones in size and sporoderm structure. The ornamentation of the spores of the Polypodiaceae is determined by the exospore, while in Nephrolepis the ornamentation is determined by the perispore.

Palavras-chave : Davalliaceae; Nephrolepis; Spores; Morphology; Sculpture; Ultrastructure; Argentina.

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