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.
Basionym
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).
Eponomy
Named for Isabella Iona Abbott, Hawaiian phycologist.
General Environment
This is a marine species.
Description
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.
Habitat
Low intertidal to shallow subtidal; growing on rubble and on rocky shores, often in wave-exposed habitats.
Created: 26 April 2007 by G.M. Guiry.
Last updated: 12 April 2021
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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=132216
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 12 April 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 26 November 2024
