Gracilaria Greville, 1830, nom. et typ. cons.

Lectotype species: Gracilaria compressa (C.Agardh) Greville

Currently accepted name for the type species: Gracilaria bursa-pastoris (S.G.Gmelin) P.C.Silva

Original publication: Greville, R.K. (1830). Algae britannicae, or descriptions of the marine and other inarticulated plants of the British islands, belonging to the order Algae; with plates illustrative of the genera. pp. [i]-lxxxviii, [1]-218, pl. 1-19. Edinburgh & London: McLachlan & Stewart; Baldwin & Cradock.

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Type designated in: Steentoft, M., Irvine, L.M. & Bird, C.J. (1991). Proposal to conserve the type of Gracilaria, nom. cons., as G. compressa and its lectotypification (Rhodophyta: Gracilariaceae). Taxon 40: 663-666.

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Description: Tetrasporangia superficial, in both unmodified cortex or in sori. Spermatangial conceptacles of the shallow cortical type only (i.e., textorii-type or the verrucosa-type sensu Yamamoto 1975, 1978, 1984). Gonimoblast filaments consisting of vacuolated cells in center towards the base, becoming elongated and highly branched towards the outside and bearing carposporangia in branched chains, the carposporangia cut off by oblique division with the carpospores terminal, maturing basipetally; tubular nutritive cells numerous, variable in diameter, connecting to outer pericarp, initially fusing with single pericarp cell that may fuse progressively with neighboring pericarp cells, extending the length of the tubular nutritive cells to form a tube-shaped pericarp fusion cell that sometimes leaves behind remnant pit connections; carpogonial fusion cell with numerous enlarged nuclei, extending moderately through fusion with adjoining inner pericarp cell, becoming embedded longitudinally in the inner pericarp; cystocarp cavity formed schizogenously as the gonimoblasts grow by the dissolution of pit connections between inner and outer gonimoblast filaments; inner pericarp composed of straight cell rows, five to seven cells long, in which each cell contains an enlarged nucleus; fusion cell persisting or disintegrating at the mature stages of cystocarp development.

Information contributed by: Gurgel et al. 2018. The most recent alteration to this page was made on 2021-09-17 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Lyra, D. de M., Iha, C., Grassa, C.J., Cai, L., Zhang, H.G., Lane, C., Blouin, N., Oliveira, M.C., Nunes, J. M de C. & Davis, C.C. (2021). Phylogenomics, divergence time estimation and trait evolution provide a new look into the Gracilariales (Rhodophyta). Molecular Phylogenetics and Evolution 165(107294): [1-14], 4 figs.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 17 September 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 24 June 2024

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