Abstract

ROJAS-CANO, Adriana; ARREGUIN-SANCHEZ, María de la Luz; FERNANDEZ-NAVA, Rafael  and  QUIROZ-GARCIA, David Leonor. Description and illustration of the morphogenic development of the young gametophytes and sporophytes of Asplenium blepharophorum Bertol. (Aspleniaceae-Polypodiidae) en tres sustratos naturales. Polibotánica [online]. 2023, n.56, pp.17-37.  Epub Sep 18, 2023. ISSN 1405-2768.  https://doi.org/10.18387/polibotanica.56.2.

Prothallus development and the young sporophytes of Asplenium blepharophorum Bertol., are described and illustrated. The studied material was collected in a cloud forest in San Antonio, 1 km north of Amecameca municipality, State of México. The spores were sown in a glass vessel of 125 ml prepared in the following manner: the glasses were layered with ceramic, river stone, mosquito net and the three natural substrates: maquique, moss and plant litter, all previously sterilized and enclosed in a plastic bag tied with copper wire. The cycle was isosporeus with Vittaria type germination and prothallial development corresponding to the Aspidium type. The gametophytes were male and female; in maquique, only gametophyte female. The prothallus with sexual dimorphism, the male chordate with cauda and the female chordate with numerous rhizoids and pads, the gametangia did not mature. Young sporophytes were apogamous obtained around 351 days after sowing in maquique, 356 in moss and the plant litter 473. The possibility of it being a hybrid or polyploid entity is discussed because apogamic sporophytes developed in the three substrates and most of the sporangia had 32 spores.

Keywords : apogamy; sexual dimorphism; sporophytes; gametangia; fern.

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