Notheia Harvey & J.W.Bailey, 1851

Holotype species: Notheia anomala Harvey & Bailey

Original publication and holotype designation: Harvey, W.H. & Bailey, J.W. (1851). [Dr. Gould presented, in behalf of Professors W.H. Harvey of Trinity College, Dublin, and J.W. Bailey of West Point, descriptions of seventeen new species of Algae collected by the United States Exploring Expedition...]. Proceedings of the Boston Society of Natural History 3: 370-373.

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Description: Thallus to 12 (20) cm long, main axes to 2 mm diameter, much branched with irregularly arranged laterals. Most lateral branches arise as outgrowths from conceptacles. Growth is apical resulting from the activity of apical cells and their derivatives. Thallus is parenchymatous and differentiated into a meristoderm having relatively small cells with numerous chloroplasts, a cortex of larger cells and a filamentous medulla. Discoid chloroplasts lack pyrenoids. Phaeophycean hairs develop from meristoderm and conceptacles. Life history is diplontic. Sexual reproduction is anisogamous. Individuals are monoecious with conceptacles containing both male and female gametangia scattered all over the thallus. Male gametangia produce 64 gametes, 5 x 3 µm. Female gametangia produce eight large zoids, 10-12 x 5-6 µm. Male and female gametes are heterokont, possess an eyespot and are positively phototactic. Plasmogamy occurs only after female gametes have settled on the host surface.

Information contributed by: M. N. Clayton. The most recent alteration to this page was made on 2014-06-21 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: 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.

Comments: Notheia occurs in temperate regions of Australia and New Zealand on 2 host genera: Hormosira and Xiphophora; it grows intertidally, often in pools. Notheia grows only on Hormosira or Xiphophora with its base endophytic in the host.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=42568

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 21 June 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 25 April 2024