Acinetospora Bornet, 1892

Holotype species: Acinetospora pusilla (A.W.Griffiths ex Harvey) De Toni

Currently accepted name for the type species: Acinetospora crinita (Carmichael) Sauvageau

Original publication and holotype designation: Bornet, E. (1892). Note sur quelques Ectocarpus. Bulletin de la Société Botanique de France 38: 353-372.

Description: The upright filaments are uniseriate usually with meristematic zones near the base. Branching is often hypomeristematic and formation of plurilocular sporangia occurs by transformation of hypomeristematic laterals giving rise to sessile or shortly stalked sporangia. Unilocular sporangia are sessile or provided with a short stalk. Ovoid monosporangia have been reported by Sauvageau (1899). Short laterals - "crampons" in French literature - are present. The life history of the type species is not fully understood. Kornmann (1953) reported on presumably diploid plants with plurilocular and unilocular sporangia. The swarmers from the plurilocular sporangia function as zoospores; they are large, up to 38 _m long and 20 _m broad with limited motility probably due to reduced length of the flagella. The swarmers from the unilocular sporangia develop into plants similar to the sporophyte. At fertility they also carry plurilocular sporangia with large loculi (zoosporangia) and sporangia with small loculi (gametangia?). However, sexual reproduction has not been observed, and there is no karyological evidence to support that meiosis occurs in the unilocular sporangia. Müller (1986) reported on apomeiotic unilocular sporangia and the loss of sexual reproduction could be responsible for the establishment of geographically isolated populations and the great specific variability within the genus. Knoepffler-Péguy (1977) convincingly showed that Acinetospora and Feldmannia cannot be separated as these "genera" represent morphological expressions under control of environmental conditions. Acinetospora has priority.

Information contributed by: P. M. Pedersen. The most recent alteration to this page was made on 2015-05-01 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Silberfeld, T., Rousseau, F. & Reviers, B. de (2014). An updated classification of brown algae (Ochrophyta, Phaeophyceae). Cryptogamie Algologie 35(2): 117-156, 1 fig., 1 table.

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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=32852

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 01 May 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 21 November 2024