Avrainvillea Decaisne, 1842

Holotype species: Avrainvillea nigricans Decaisne

Original publication and holotype designation: Decaisne, J. (1842). Mémoire sur les corallines ou polypiers calcifères. Annales des Sciences Naturelles, Botanique, Seconde Série 18: 96-128.

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Precise date of publication: August 1842

Description: Thallus is composed of one or more stipitate blades arising from well-developed submerged or emergent holdfasts. Blade, stipe and holdfast can be reduced or modified in different species. Stipe can be solitary, unbranched and bearing a single terminal blade, or branched one to many times with each branch bearing a single terminal blade. Blades are usually flabellate, 2-30 cm. tall (including stipe), never calcified, variably zonate, composed of true non-septate siphons. Siphons are tightly or loosely consolidated, dichotomously branched, and lack lateral branchlets. Siphons may be cylindrical, tortuous, torulose or moniliform either exclusively or in combination; dichotomal constrictions deep or shallow; apices rounded, pointed, threadlike, hooked or clavate. Life history of Avrainvillea has not been experimentally verified, but is believed to be similar to other udoteacean genera, i.e. a dioecious diploid erect thallus in which meiosis precedes gametogenesis. Thalli are holocarpic. Vegetative propagation is more common and constant throughout the year. Turnover times of 4-6 weeks have been observed in some species. Time between disappearance of old blade and development of new one can be as little as 48 h. Rhizomatous portion of thallus may represent up to 90% of thallus and should be considered more than just a holdfast.

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.

Comments: Geographical distribution is pantropical to subtropical (Hawaii, Mediterranean and Australia) with some regional endemism. It is common on sand plains, coral rubble and in seagrass beds; reported to -60m.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=36011

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 10 August 2022

 
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