150,341 species and infraspecific names are in the database, 20,442 images, 57,835 bibliographic items, 381,242 distributional records.

Acrochaetium Nägeli, 1858

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Nemaliophycidae
Order Acrochaetiales
Family Acrochaetiaceae

Lectotype species: Acrochaetium secundatum (Lyngbye) Nägeli

Original publication:Nägeli, C. & Cramer, C. (1858). Die Stärkekörner: Morphologische, physiologische, chemisch-physicalische und systematisch-botanische Monographie. Pflanzenphysiologische Untersuchungen. 2. Heft. pp. [i]-x, [1]-623, pls XI-XXVI. Zürich: bei Fredrich Schultness.
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Type designated in Woelkerling, W.J. (1983). The Audouinella (Acrochaetium-Rhodochorton) complex (Rhodophyta): present perspectives. Phycologia 22: 59-92, 22 figs, 10 tables.

Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as neuter.

Most recent taxonomic treatment adopted: Harper, J.T. & Saunders, G.W. (2002). A re-classification of the Acrochaetiales based on molecular and morphological data, and establishment of the Colaconematales, ord. nov.. British Phycological Journal 37: 463-475.

Taxonomic notes
Harper & Saunders (2002) circumscribed this genus for marine species with monosporangia and stellate chloroplasts. - (5 Oct 2010) - M.D. Guiry

Description: Plants uniseriate filamentous, ecorticate, in general of small dimensions, rarely over 5 mm high. Cells with a single centrally located stellate chloroplast and a central pyrenoid, rarely more than one. Species with known life history with markedly heteromorphic generations; gametophytes with unicellular base and 1-6 erect axes, tetrasporophytes with a septately germinated spore and a multicellular filamentous base producing few to many upright axes. Branching of erect axes in both generations irregular, secund or opposite; unicellular hairs sometimes present. Sexual plants monoecious or dioecious. Spermatangia in small clusters. Carpogonia sessile or pedicellate, distinct carpogonial filament absent. Development of carposporophyte direct. Fertilized carpogonium dividing transversely, sometimes remaining undivided. Carposporophytes small, globose, producing few to several terminal carpospores; sterile involucre absent. Tetrasporangia formed in terminal or lateral positions on erect axes and laterals; sporangia cruciately divided. Asexual reproduction by means of monosporangia occurring in both generations, in many species the only form of propagation known. Emended by J.T. Harper & G.W. Saunders (2002: 470). Now comprises marine spp. [Audouinella comprises freshwater spp.]

Information contributed by: H. Stegenga. The most recent alteration to this page was made on 20 Jan 2017 by M.D. Guiry.

Comments: Worldwide, almost exclusively marine, most diversified in temperate areas, especially the North Atlantic. Plants often epiphytic on other algae or marine angiosperms, sometimes epizoic, semi-endophytic or semi-endozoic. See Harper & Saunders (2002: 470).

Numbers of names and species: There are 299 species names in the database at present, as well as 33 infraspecific names. Of the species names, 166 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Clik here to also show infraspecific names in the list below.

References
Harper, J.T. & Saunders, G.W. (2002). A re-classification of the Acrochaetiales based on molecular and morphological data, and establishment of the Colaconematales, ord. nov.. British Phycological Journal 37: 463-475.

Wynne, M.J. & Schneider, C.W. (2010). Addendum to the synoptic review of red algal genera. Botanica Marina 53: 291-299.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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.

Created: 28 December 2000 by M.D. Guiry

Verified by: 20 January 2017 by M.D. Guiry

Linking to this page: http://algaebase.org/search/genus/detail/?genus_id=kb800fbe0776db57a

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 22 January 2018.

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