153,615 species and infraspecific names are in the database, 20,981 images, 59,407 bibliographic items, 412,628 distributional records.

Raphidonema Lagerheim, 1892

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Trebouxiophyceae
Order Prasiolales
Family Koliellaceae

Holotype species: Raphidonema nivale Lagerheim

Original publication and holotype designation: Lagerheim, G. (1892). Die Schnee Flora des Pinchincha. Ein Beitrag zur Kenntnis der Nivalen Algen und Pilzen. Bericht der Deutschen Botanischen Gessellschaft 10: 517-534, pl. XXVIII.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: John, D.M. (2002). Orders Chaetophorales, Klebshormidiales, Microsporales, Ulotrichales. In: The Freshwater Algal Flora of the British Isles. An identification guide to freshwater and terrestrial algae. (John, D.M., Whitton, B.A. & Brook, A.J. Eds), pp. 433-468. Cambridge: Cambridge University Press.

Taxonomic notes
Neustupa et al. (2009: fig. 28) and Neustupa et al. (2011: fig. 22) place Raphidonema sempervirens [type species = R. nivale] in the Prasiola-clade. - (18 Mar 2011) - Wendy Guiry

Description: Filaments relatively short, unbranched and uniseriate, (2-) 4-16 (-32) celled, straight or slightly bent, not specifically attached. Interjacent central cells cylindrical, polar cells acuminate or gradually tapering into bristle-like point. Cell membrane tiny, thin, hyaline without mucilaginous sheath. Chloroplast single, parietal, laminate or girdle-shaped, without pyrenoids. Asexual reproduction only by vegetative propagation of filaments. Cell multiplication by vegetative cell division. Method of sexual reproduction unknown. Raphidonema widely distributed and cryobiontic; in large quantities producing distinct green snow, up to several cm deep. Because of its filamentous growth habit, Raphidonema closely resembles the typically ulotrichalean Gleotila Kützing, differing by presence of pointed polar cells. Raphidonema may have evolved from Koliella by delayed separation of cells following cell division. Ultrastructure of cell division supports placement in charophycean line. Critical features include presence of persistent telophase spindles that widely separate daughter nuclei, and centripetal ingrowth of septum that not associated with phycoplast.

Information contributed by: G.M. Lokhorst. The most recent alteration to this page was made on 27 Feb 2016 by M.D. Guiry.

Numbers of names and species: There are 24 species names in the database at present, as well as 9 infraspecific names. Of the species names, 10 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):

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

References
Neustupa, J., Nemcová, Y., Eliéas, M. & Skaloud, P. (2009). Kalinella bambusicola gen. etsp. nov. (Trebouxiophyceae, Chlorophyta), a novel coccoid Chlorella-like subaerial alga from Southeast Asia. Phycological Research 57(3): 159-169.

Neustupa, J., Eliás, M., Skaloud, P., Nemcová, Y. & Sejnohová, L. (2011). Xylochloris irregularis gen. et sp. nov. (Trebouxiophyceae, Chlorophyta), a novel subaerial coccoid green alga. Phycologia 50(1): 57-66.

Sluiman, H.J., Guihal, C. & Mudimu, O. (2008). Assessing phylogenetic affinities and species delimitations in Klebsormidiales (Streptophyta): nuclear-encoded rDNA phylogenies and ITS secondary structure models in Klebsormidium, Hormidiella, and Entransia. Journal of Phycology 44(1): 183-195.

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: 11 April 2002 by M.D. Guiry

Verified by: 13 May 2015 by Salvador Valenzuela Miranda

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43513

Citing AlgaeBase
Please cite this record as:
Salvador Valenzuela Miranda in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 19 November 2018.

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