Abstract

LOAYZA AGUILAR, Rómulo E. Structural characteristics of the cystocarp of Gelidium serrulatum J. Agardh (Gelidiales, Rhodophyta). Arnaldoa [online]. 2019, vol.26, n.2, pp.675-688. ISSN 1815-8242.  http://dx.doi.org/10.22497/arnaldoa.261.26210.

Gelidium serrulatum is a Rhodophyta endemic to the east coast of the Caribbean Sea which, due to the quality of the agar, could be managed, hence its importance. The taxonomic knowledge of this species is based on external aspects, but its external morphology changes in the laboratory; there- fore, it was proposed to study the characteristics of the cystocarp, which is one of the most stable structures of the agarophytes. Organisms were collected in Punta Guarapo of the Venezuelan Carib- bean, with histological sections and cryofracture for scanning electron microscopy. The cystocarp is biconvex and bilocular, with symmetrical compartments. Its cortical region has a single layer of cells and the subcortical 5-6 rows, which project cortical filaments perpendicular to the carposporophyte. They are structures equipped with a cuticle and the ostioles are plugged. It presents intercalary carpogones in the subcortical region, fruiting several in the same cystocarp, and the carposporangia are individual.

Keywords : cystocarp; carpogonium; Gelidium serrulatum; Gelidiales.

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