Gracilaria isabellana Gurgel, & J.N.Norris 2004
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.
Status of name
This name is of an entity that is currently accepted taxonomically.
Fucus lacinulatus M.Vahl
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.
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.
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, -591, , 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. -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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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.