Alsidium C., 1827: 639
Holotype species: Alsidium corallinum C.Agardh
Original publication and holotype designation:Agardh, C.A. (1827). Aufzählung einiger in den östreichischen Ländern gefundenen neuen Gattungen und Arten von Algen, nebst ihrer Diagnostik und beigefügten Bemerkungen. Flora 10(40): 625-640.
Taxonomic status: currently recognized as a distinct genus.
Description: Upright radially organized polysiphonous thalli, up to 15 cm high, with cylindrical axes and progressively narrower distal branches. Branch apices abruptly tapering; trichoblasts spirally arranged on axis, present on every segment but soon deciduous; parenchymatous cortication occurring to near branch apex. 6-8 pericentral cells. Lateral polysiphonous branches originate from trichoblast basal cell. Reproductive structures on ultimate branchlets. Tetrasporangia borne, 1 per segment, in a spiral sequence, commonly causing distortion of stichidia. Cystocarps spheroidal to urceolate, lateral on ultimate branchlets. Male capitula replacing trichoblasts, conical and sometimes with sterile tips.
Comments: Low littoral to subtidal, Mediterranean; the Pacific Ocean at Palmyra Is. (Dawson 1959), The Galapagos Is. (Dawson 1963) and The Philippines (Vannajan and Trono 1978).
NCBI Nucleotide Sequences
Numbers of names and species: There are 29 species (and infraspecific) names in the database at present, of which 6 have been flagged as currently accepted taxonomically.
Names: ('C' indicates a name that is currently 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):
Alsidium adhaerens Reinsch P
Alsidium blodgettii Harvey S
Alsidium calamistratum (Mont.) Endlicher P
Alsidium comosum f. denudata J.Agardh P
Alsidium comosum f. senile J.Agardh P
Alsidium comosum Harvey S
Alsidium corallinum var. minus Moris & DeNotaris P
Alsidium corallinum C.Agardh C - type
Alsidium cymatophilum R.E.Norris C
Alsidium dasyphyllum P.L.Crouan & H.M.Crouan S
Alsidium distichum (Lindenb.) Trevisan P
Alsidium ericoides Hering S
Alsidium helminthochorton (Schwendimann) Kützing C
Alsidium lanciferum Kützing P
Alsidium notarisium Bompard C
Alsidium pacificum E.Y.Dawson C
Alsidium pusillum E.Y.Dawson C
Alsidium schottii Harvey P
Alsidium scorpioides (Hudson) J.Agardh P
Alsidium seaforthii (Turner) J.Agardh P
Alsidium spinulosum Harvey S
Alsidium striolatum (C.Agardh) Kützing S
Alsidium subtile Kützing P
Alsidium telfairii Decaisne C
Alsidium tenuissimum (Goodenough & Woodward) Kützing P
Alsidium tenuissimum f. crassus P.L.Crouan & H.M.Crouan S
Alsidium triangulare (Gmelin) J.Agardh P
Alsidium triquetrum (Gmelin) Trevisan P
Alsidium vagum (Zanardini) Zanardini C
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: http://www.algaebase.org/search/genus/detail/?genus_id=33994
Cite this record as:
Guiry, M.D. & Guiry, G.M. 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 05 December 2013.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:8187