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Gracilaria isabellana Gurgel, Fredericq & J.N.Norris 2004

Publication details
Gracilaria isabellana Gurgel, Fredericq & J.N.Norris 2004: 384, figs 34-42

Published in: Gurgel, C.F.D., Fredericq, S. & Norris, J.N. (2004). Gracilaria flabelliformis and G. apiculata (Gracilariaceae, Rhodophyta): restoring old names for common tropical western Atlantic species, including the recognition of three new subspecies, and a replacement name for "G. lacinulata". Cryptogamie Algologie 25: 367-396.

Type species
The type species (lectotype) of the genus Gracilaria is Gracilaria compressa (C.Agardh) Greville.

Status of name
This name is of an entity that is currently accepted taxonomically.

Fucus lacinulatus M.Vahl

Type information
Type locality: St. Croix, U.S. Virgin Islands (Gurgel et al. 2004: 387). Lectotype: C (Gurgel et al. 2004: 387). Notes: Lectotype: Fucus lacinulatus Vahl: C (=Borgesen, 1920: 379, Nr [fig.] 366).

Named for Isabella Iona Abbott, Hawaiian phycologist.

Homotypic Synonym(s)
Fucus lacinulatus M.Vahl 1802
Sphaerococcus lacinulatus (Vahl) Bory 1834
Gracilaria lacinulata (M.Vahl) M.Howe 1920

General environment
This is a marine species.

Algae erect, composed of compressed, linear, oblong or lanceolate main axes and branches; displaying a wide range morphological variation in size and apex shape; up to 12 cm long, up to 1.8 cm broad, and up to 1.4 mm thick; varying in color from light-green to yellow-green and olive-green to dark brown; main axis narrow at base, forming a very short, +_ terete stipe above a small round cushion-shaped holdfast. Thalli simple or irregular, di- to trichotomously branched in one plane; blades someimes twisted. Branchlets simple, arising from margins only, irregularly distributed, occasionally secund; usually concentrated at top of major axes; sometimes compressed at base; with rounded, sometimes bent, apices. Cortex 1-2 cell layers thick; cortical cells of variable size, mostly anticlinally elongated, 12.5-31.25 microns (mean = 21.0 microns) by 7.5-18.5 microns (mean = 13.0 microns). Hair cells and gland cells rare. Abrupt transition from a central medullary layer of 3(-5) large, thick-walled medullary cells, 197.6-516.0 microns (mean = 328.7 microns) by 101.3-247.0 microns (mean = 175.4 microns) to an outer cortical layer of 1-2 small cortical cells; medullary cells compressed in same plane as the thallus, and rich in floridean starch. Cystocarps conspicuous, protruding on both sides of blade, spherical, dark-purple to black, constricted at base; in longitudinal section 675.0-872.0 microns (mean = 780.5 microns) tall by 1.0-1.075 mm (mean= 1.041 mm) diameter. Pericarp 175 microns thick, composed of (9-) 10-13 cell layers. Inner gonimoblasts composed of large, radially elongated cells around a conspicuous fusion cell, 117.5 microns by 37.50 microns. Nutritive tubular cells present. Spermatangia and tetrasporangia not found.

Low intertidal to shallow subtidal; growing on rubble and on rocky shores, often in wave-exposed habitats.

Detailed distribution with sources (Click to Load)

Key references
Ardito M., S., Núñez-Resendiz, M.L., Dreckman, K.M. & Sentíes, A. (2017). Gracilaria falconii sp. nov. (Gracilariales, Rhodophyta): a new species with flat axes from Venezuela. Phytotaxa 292(3): 271-278, 9 figs, 1 table.

Dawes, C.J. & Mathieson, A.C. (2008). The seaweeds of Florida. pp. [i]- viii, [1]-591, [592], pls I-LI. Gainesville, Florida: University Press of Florida.

Lyra, G. de M., Gurgel, C.F.D., Costa, E. da Silva, Barreto de Jesus, P., Caires, T.A., Gama de Matos, J.C., Oliveira, M.C., Oliveira, E.C. & Nunes, J.M.C. (2015). A new tropical species of Gracilariaceae (Rhodophyta, Gracilariales): Gracilaria silviae sp. nov. Phytotaxa 222(3): 199-210, 12 figs.

Lyra, G. de M., Nunes, J.M. de C., Pestana, E.M. dos S., Matos, J.C.G de, Caires, T.A., Jesus, P.B. de, Costa, E.S. & Oliviera, M.C. (2021). Diversity fo Gracilariaceae (Rhodophyta) in Brazil: integrating morphological and molecular data. Phytotaxa 496: 1-53, 15 figs, 1 table, 2 Supplementary tables .

Suárez, A.M., Martínez-Daranas, B. & Alfonso, Y. (2015). Macroalgas marinas de Cuba. pp. [1]-264, 229 figs. La Habana [Havana]: UH [Universidad de La Habana] Editorial.

Created: 26 April 2007 by G.M. Guiry

Verified by: 12 April 2021 by M.D. Guiry

Accesses: This record has been accessed by users 1200 times since it was created.

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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 12 May 2021.

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