155,250 species and infraspecific names are in the database, 21,864 images, 60,043 bibliographic items, 435,057 distributional records.

Fischerella (Bornet & Flahault) Gomont, 1895

Empire Prokaryota
Kingdom Eubacteria
Subkingdom Negibacteria
Phylum Cyanobacteria
Class Cyanophyceae
Subclass Nostocophycidae
Order Nostocales
Family Hapalosiphonaceae

Holotype species: Fischerella thermalis Gomont

Original publication and holotype designation: Gomont, M.[A]. (1895). Note sur le Scytonema ambiguum Kützing. Journal de Botanique 9: 49-52, pl. 3 [missing].
 Download PDF

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Komárek, J., Kastovsky, J., Mares, J. & Johansen, J.R. (2014). Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach. Preslia 86: 295-335.

Description: Filamentous-thallose; thallus usually felt-like, rarely in compact mats, composed of creeping, uni- or multiserial filaments and morphologically different, more or less erect uniseriate branches. Creeping trichomes usually moniliform, enveloped by thick, waved, sometimes slightly lamellated and colored sheath, with usually barreliform cells, sometimes enveloped by their own gelatinous sheaths; erect true branches develop usually unilaterally after the lengthwise cell division in basal trichomes (T-type branching), usually cylindrical, with cylindrical and often elongated cells and thin, mainly colorless sheaths. Cells usually with slightly granular contents, thylakoids distributed irregularly throughout. Heterocytes intercalary, subspherical in basal trichomes, cylindrical in branches. Akinetes develop occasionally and irregularly in basal trichomes (in a few species). Reproduction by uniseriate hormogonia, which separate from ends of branches; they are usually morphologically very distinct (different from other cells in branches) and contain aerotopes (liberation usually during humid vegetation periods). Most species are subaerophytic, growing on wet (often acidic, peaty) soils, several species occur only in tropical forests (on bark of trees, mosses, etc.).

Information contributed by: J. Komárek. The most recent alteration to this page was made on 5 Dec 2016 by M.D. Guiry.

Numbers of names and species: There are 22 species names in the database at present, as well as 6 infraspecific names. Of the species names, 18 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.

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

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: 05 December 2016 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43621

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 May 2019.

SITE © 1996 - 2019 M.D. Guiry. All rights reserved.

Website Design : 249 Design Studio