Chondracanthus exasperatus (Harvey & Bailey) Hughey 1996

Chondracanthus exasperatus (Harvey & Bailey) Hughey

Current name: Chondracanthus exasperatus (Harvey & Bailey) Hughey
Bamfield, Vancouver Island, Canada; plants at low water - 27 April 2004. Michael Guiry (

Publication Details
Chondracanthus exasperatus (Harvey & Bailey) Hughey 1996: 23

Published in: Hughey, J.R. Dudash, R. & Kjeldsen, C. K. (1996). A field and molecular systematic study on species of Chondracanthus (Gigartinales, Rhodophyceae) from Pacific North America. Journal of Phycology 32: 22-23.

Type Species
The type species (lectotype) of the genus Chondracanthus is Chondracanthus chauvinii (Bory) Kützing.

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

Gigartina exasperata Harvey & Bailey

Type Information
Type locality: Oposite Fort Nisqually, Puget Sound, Washington, USA; (Hughey & Hommersand 2008: 137) Lectotype: cystocarpic specimen: 1838-1842; TCD; 94544 (Hughey & Hommersand 2008: 137)

General Environment
This is a marine species.

Thalli 20-70 cm tall, fleshy or crisp, yellowish- green to brownish-red in sheltered habitats, brick red (north of Point Conception and in Baja California) or pink (south of Point Conception to the Mexican border) on exposed coasts, consisting of one to several blades from a discoid holdfast up to 1 cm broad; blades 6- 20 cm wide, 0.2-3 mm thick, simple or forked, lanceolate to long-elliptical and tapered to a blunt or acuminate tip, the margins entire or dentate or sometimes bearing bladelets; stipitate, the stipe usually 2-3 cm long bearing lateral bladelets and expanding to a short, fleshy and flattened cuneate base; surface and margins of blades, except the base covered with closely to widely spaced, spinose outgrowths; cortex 5-7 cell layers thick; medullary cells variable in size and shape, 1.5-24 mm in width. Spermatangial sori superficial, indefinite on slender, elongate papillae with thin attenuating tips. Gonimoblast forming a compact group of cells around the auxiliary cell with cortical and medullary cells producing short-celled filaments circling the gonimoblasts; later in development, a well-defined envelope composed of short and dense filaments forms to surround the carposporophyte. Cystocarps 0.8-1.5 mm in diameter, hemispherical, frequently fusing to form a single, compound cystocarp, located in papillae that are sometimes ornamented with spines, 1-3 per papilla. Carpospores subspherical, 12-18 µm in diameter, at maturity released through an ostiole. Tetrasporangial sori 0.2-1 mm in diameter, developing at the junction between the emerging papilla and the blade. Tetrasporangia 34-42 µm in diameter, transforming from primary cortical filaments in branched chains 9-12 cells long. As the papilla grows, the new primary cortical filaments are transformed into tetrasporangial chains, sometimes forming 2-3 hemiispherical rings of sori on the nipple-like papillae. At maturity tetraspores are released through cracks in the cortical wall, leaving behind an empty cavity.

Low intertidal, exposed rocky headlands to sheltered localities.

Created: 13 April 1998 by M.D. Guiry.

Last updated: 22 August 2013

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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 22 August 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 03 June 2023

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