Fortiea G.De Toni, 1936

Lectotype species: Fortiea caucasica (Elenkin) De Toni

Original publication and holotype designation: De Toni, G. (1936). Noterelle di nomenclatura algologica. VIII. Terzo elenco di Missoficee omonime. pp. 6. Brescia.

Description: Filamentous; filaments heteropolar, differentiated into basal part with a heterocyte and free apical end, cylindrical, simple, solitary or in small groups; filaments usually creeping on the substrate or growing in periphyton. Sheaths firm, envelop always only one trichome, colorless, sometimes thick and lengthwise and crosswise layered. Trichomes always with a basal, hemispherical or spherical heterocyte, rarely also with cylindrical intercalary heterocytes, at which trichomes dissociate; trichomes cylindrical or slightly widened at the base, narrowed in the middle part and clearly widened at the ends, constricted or unconstricted at the crosswalls, but usually constricted at the ends. Cells cylindrical or barrel-shaped, in the middle part usually clearly longer than wide, at the bases and at the ends shortened up to isodiametric or shorter than wide; end cells widely rounded or spherical. Aerotopes absent. Akinetes develop rarely in basal parts of trichomes, usually in rows and separated by heterocytes (known in several species only). Cell division crosswise, perpendicular to the long axes of trichomes; in old trichomes apical meristematic zones. Trichomes dissociate at heterocytes. Reproduction by hormogonia, which separate from trichomes by necridic cells and by akinetes. Periphytic among other algae and aquatic plants with plenty of detritus (tropical alkaline pools and swamps, moors in temperate zones, littoral of lakes), the type species is known from creeks and waterfalls in limestone mountains, one species was described from the littoral of a tropical saline lake. All species probably with geographically limited areas of distribution.

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=46463

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 25 April 2024