Chlorochytrium Cohn, 1872: 102
Holotype species: Chlorochytrium lemnae Cohn
Original publication and holotype designation:Cohn, F. (1872). Über parasitische Algen. Beitr. Biol. Pflanzen 1(1): 87-106.
Taxonomic status: currently recognized as a distinct genus.
Description: Thalli unicellular, endophytic or parasitic in aquatic vascular plants, bryophytes or marine algae. Cells irregularly globose, ellipsoidal, ovoid to variously lobed, up to 100 &m in max. dimension. Cell walls thin and homogeneous or relatively thick and stratified, sometimes with one or more local thickenings. Cells uninucleate; chloroplast parietal, having one to many pyrenoids; initially cup-shaped, later occupying entire cell periphery and becoming reticulate. Asexual reproduction by biflagellate (?naked) zoospores, arising by repeated bipartition of protoplast; the numerous spores released by rupture or local dissolution of sporangial wall, sometimes through tubular or sac-like evagination. Resting cells (akinetes) red to brownish, densely packed with starch grains. Sexual reproduction known only in some species. Biflagellate isogametes can leave sporangial wall in common gelatinous vesicle and fuse into quadriflagellate zygospore that settles on host after short motile period. Development of zygospore (and zoospore) into vegetative cells begins with cell wall formation and proliferation of tubular protrusion penetrating into host tissues. Chlorochytrium mostly in freshwater with at least one species marine; endophytic or parasitic in various aquatic vascular plants or bryophytes (e.g., Lemna, Potamogeton, Elodea, Sphagnum) or macroscopic marine algae. Reported from Europe, North America and India.Genus similar and related to Kentrosphaera, and adequate characterization of type species (C. lemnae, K. facciolae) required for clear statement of diagnostic features. Because original description of Chlorochytrium incomplete, intrageneric taxonomy remains confused. Most species have uncertain status, and some species known to be life history phases of other genera (e.g., C. inclusum in Spongomorpha, C. cohnii in Chlorocystis). In addition, rather different algae identified as C. lemnae (cf. accounts of Cohn, Klebs, Bristol, Lewin).
NCBI Nucleotide Sequences
Numbers of names and species: There are 24 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):
Chlorochytrium archerianum Hieronymous S
Chlorochytrium bienne (Klebs) G.S.West S
Chlorochytrium bristoliae (G.M.Smith) D.M.John & P.M.Tsarenko P
Chlorochytrium bristoliae (G.M.Smith) D.M.John & Tsarenko S
Chlorochytrium cohnii E.P.Wright C
Chlorochytrium crassum (Naccari) Rabenhorst S
Chlorochytrium dermatocolax Reinke C
Chlorochytrium dinobryonis J.W.G.Lund S
Chlorochytrium facciolae (Borzì) Bristol S
Chlorochytrium facciolae var. minor (Borzì) Bristol U
Chlorochytrium gloeophilum Bohlin S
Chlorochytrium grande Bristol S
Chlorochytrium immersum Massee S
Chlorochytrium inclusum Kjellman S
Chlorochytrium knyanum Szymanski S
Chlorochytrium lemnae Cohn C - type
Chlorochytrium limnanthemum (Cunningham) G.S.West S
Chlorochytrium moorei N.L.Gardner S
Chlorochytrium pallidum Klebs S
Chlorochytrium paradoxum (G.A.Klebs) G.S.West S
Chlorochytrium porphyrae Setchell & N.L.Gardner C
Chlorochytrium sarcophyci (Whitting) G.S.West C
Chlorochytrium schmitzii Rosenvinge C
Chlorochytrium willei Printz S
Skaloud, P., Kalina, T., Nemjová, K. De Clerck, O. & Leliaert, F. (2013). Morphology and phylogenetic position of the freshwater green microalgae Chlorochytrium (Chlorophyceae) and Scotinosphaera (Skotinosphaerales, ord. nov., Ulvophyceae). Journaal of Phycology 49(1): 115-129.
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=32800
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 11 December 2013.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:8352