Hassallia Berkeley ex Bornet & Flahault, 1886
Lectotype species: Hassallia byssoidea Hassall ex Bornet & Flahault
Original publication: Bornet, É. & Flahault, C. (1886 '1887'). Revision des Nostocacées hétérocystées contenues dans les principaux herbiers de France (Troisième fragment). Annales des Sciences Naturelles, Botanique, Septième série 5: 51-129.
Request PDFType designated in: Geitler, L. (1942). Schizophyta: Klasse Schizophyceae. In: Die natürlichen Pflanzenfamilien, Sweite Auflage. (Engler, A. & Prantl, K. Eds) Vol.1b, pp. 1-232. Leipzig: Wilhelm Engelmann.
Description: Filamentous; filaments heteropolar, with basal parts with heterocytes and free apical ends, commonly falsely branched with solitary lateral branches initiating at the heterocytes (mainly unipored) and fragile (sometimes liberating from the "mother" filament), united in fasciculate, caespitose, crustose, thin or woolly mats, sometimes creeping on a substrate; branches diverging from the main trichome, more or less short, usually arcuated. Sheaths thick, firm, lamellated, colorless or yellow-brown, open at the apex. Trichomes and branches with basal (rarely also with intercalary) heterocytes, cylindrical, not attenuated or slightly attenuated at apices, constricted at the crosswalls. Cells barrel-shaped, shorter than wide to discoid; end cells slightly narrowed and widely rounded, with granular content. Aerotopes and akinetes lacking. Cells divide crosswise to the trichome axis, characteristic are the terminal meristematic zones. Reproduction by separated branches or hormogonia, which germinate at both sides, but later (after formation of heterocytes) they change in heteropolar growth. Most species are aerophytic, growing on stones and bark of trees, several species occur rarely in submersed biotopes. Distribution of various species is poorly known, mainly because of many misidentifications.
Information contributed by: J. Komárek. The most recent alteration to this page was made on 2023-03-06 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Gender: This genus name is currently treated as feminine.
Most recent taxonomic treatment adopted: Strunecký, O., Ivanova, A.P. & Mares, J. (2022 '2023'). An updated classification of cyanobacterial orders and families based on phylogenomic and polyphasic analysis (Review). Journal of Phycology 59(1): 12-51.
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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.
Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=44303
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 06 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 18 April 2024
