Hypnea J.V.Lamouroux, 1813

Lectotype species: Hypnea musciformis (Wulfen) J.V.Lamouroux

Original publication: Lamouroux, J.V.F. (1813). Essai sur les genres de la famille des Thalassiophytes non articulées. Annales du Muséum d'Histoire Naturelle, Paris 20: 21-47, 115-139, 267-293, pls 7-13.

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Type designated in: Kylin, H. (1932). Die Florideenordung Gigartinales. Acta Universitatis Lundensis 28(8): 1-88, 22 figs, 28 pls.

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Description: Plants are generally terete, erect or in entangled clumps, or minute parasites. Apices are uniaxial, and cross sections are pseudoparenchymatous throughout, the medulla surrounding the usually distinct central axial filament and in many species containing greater or lesser numbers of cells with lenticular secondary wall thickenings. Inner cells are multinucleate and linked by secondary pit connections. Female gametophytes are procarpic, the 3-celled carpogonial branches borne singly and laterally on inner cortical cells and directed thallus outwardly. Auxiliary cells are intercalary, borne directly distal to the supporting cell in the same cortical filament, and are diploidized by a short process or direct fusion with the fertilized carpogonium. The single gonimoblast initial is directed thallus inwardly. Cystocarps are protuberant, ostiolate or non-ostiolate, encased in a thick pericarp, and consist of a central sterile tissue of large isodiametric cells surrounded by radiating gonimoblasts ending in single, terminal carposporangia. A basal nutritive tissue generally subtends the gonimoblast. Spermatangia occur in clusters. Tetrasporophytes are isomorphic with gametophytes and produce zonate tetrasporangia in nemathecia or sori.

Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 2018-09-26 by M.D. Guiry.

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

Most recent taxonomic treatment adopted: Huisman, J.M. (2018). Algae of Australia. Marine benthic algae of north-western Australia. 2. Red algae. pp. [i]-xii, 1-672, 189 figs. Canberra & Melbourne: ABRS & CSIRO Publishing.

Comments: The Hypneaceae is a family of 1 free-living and 1 parasitic genus (Hypenocolax). As pointed out by Min-Thein and Womersley (1976), the Hypneaceae is virtually indistinguishable on present criteria from the family Cystocloniaceae, especially the genus Calliblepharis. The two families differ in the consistently single, rather than paired or chained, carposporangia of the Hypneaceae, and the tendency of most Hypnea species to be terete, rather than compressed or flattened. The species of Hypnea that have been tested produce kappa or kappa and iota carrageenans. This, plus the widespread tropical distribution and abundance of the species has led to great interest in their cultivation and harvesting in the northern and western Indian Oceans (Mshigeni 1978; Parekh et al. 1988; Dawes 1987). The Hypneaceae, questionably distinct from the Cystocloniaceae on anatomical grounds, were recently subsumed into the latter family by Saunders et al. (2004) based on small-subunit rDNA sequence studies.

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Contributors
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.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=32938

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 26 September 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 03 October 2022

 
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