Boergesenia J.Feldmann, 1938

Holotype species: Boergesenia forbesii (Harvey) Feldmann

Original publication and holotype designation: Feldmann, J. (1938). Sur un nouveau genre de Siphonocladacées. Compte Rendu Hebdomadaire des Séances de l’Académie des Sciences. Paris. 206: 1503-1504.

Description: Thalli composed of one to many unbranched, elongate, pyriform vesicles forming incurved rosette-like clusters. Siphonous cells 2-8 mm diameter at distal ends, 1-5 cm tall. Annular constriction prominent on tapered basal ends of vesicles. Apical orientation maintained throughout development. Rhizoid well developed from which new uprights can arise. Adventitious rhizoids, tenacular cells and lenticular cells not present. Cell division by modified segregative division in main axes; by centripetal invagination in rhizoid. Cells multinucleate, with numerous discoid chloroplasts each with single pyrenoid surrounded with starch sheath and bisected by traversing thylakoids. Sexual life history unknown. Haploid and diploid chromosome counts of 14-18 and 36 reported for B. forbesii. Nuclear DNA amounts of 2.7, 4.9 and 9.5 pg (1C, 2C and 4C) estimated for B. forbesii. Boergesenia occurs only in the tropical Indo-West Pacific where it is found in very snady, coral rubble habitats. Strong water motion seems to be important although the banana-like clusters are often found in more sheltered crevices and often by themselves. Because of its large cell size, Boergesenia has been used for a wide variety of physiological, developmental and nuclear studies. The cytoskeleton and its role in cytoplasmic motility has been extensively studied.

Information contributed by: J.L. Olsen. The most recent alteration to this page was made on 2011-08-29 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.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=40960

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 29 August 2011. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024