Fase gametofítica de las tres variedades de Argyrochosma nivea (Pteridaceae).
DOI:
https://doi.org/10.24310/abm.v42i1.3008Abstract
La finalidad de este trabajo es describir características de la fase gametofítica de Argyroschoma nivea con el objeto de caracterizar esta fase del ciclo de vida y aportar evidencias a las relaciones entre las tres variedades de la especie (var. flava, var. nivea, y var. tenera). Para ello se consideraron cantidad de esporas por esporangio, tamaño de las esporas y se obtuvieron los gametofitos mediante cultivos en medios estériles. Se realizaron observaciones mediante microscopía de luz y electrónica de barrido. Se encontró que las tres variedades presentan 32 esporas por esporangio, comparten idéntico patrón de germinación, desarrollan gametofitos cordiformes asimétricos, y su reproducción es apogámica, de tipo obligada en las var. nivea y tenera. Los esporofitos de la var. flava desarrollan tricomas secretores de farina de color blanco sobre toda la superficie.
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