Titanoderma Nägeli, 1858

Holotype species: Titanoderma pustulatum (J.V.Lamouroux) Nägeli

Original publication and holotype designation: Nägeli, C. (1858). Die Stärkekörner. In: Pflanzenphysiologisce Untersuchungen. (Nägeli, C. & Cramer, C. Eds) Vol. 2, pp. i-x, 1-623. Zürich:

Description: Thalli comprising crusts, irregularly shaped or crowded with protuberances; dorsiventral and/or radial in organization. Epiphytic, epilithic, or unattached. Epiphytic plants sometimes surrounding host branches. Filaments of one (monomerous) or two (dimerous) orders; first-order filaments (primigenous filaments) growing along substrate or into protuberances; second-order filaments (postigenous filaments) growing at right angles from first-order filaments. First-order filaments often containing stratified elongated cells (palisade cells). Outermost walls of epithallial cells rounded or flattened, not flared. Cells in contiguous filaments frequently joined by secondary pit-connections; cell fusions rare. Trichocytes essentially unknown. Reproductive cells forming within uniporate conceptacles. Tetrasporangia or bisporangia arranged in periphery of conceptacle or scattered over the entire floor; central columella present or absent. Apical sporangial plugs absent. Gametangia poorly known.

Information contributed by: H.W. Joahnsen. The most recent alteration to this page was made on 2017-01-20 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 neuter.

Most recent taxonomic treatment adopted: Athanasiadis, A. (2016). Phycologia Europaea Rhodophyta Vol. I. pp. [i]-xxxxviii, 1-762. Thessaloniki: Published and distributed by the author.

Comments: Titanoderma (usually reported as Dermatolithon) appears to be widespread, but because of nomenclatural confusion the extent of its distribution is not clear. Suneson (1950, as Lithophyllum) reported on the bispore vs. tetraspore situation in Europe. Titanoderma is closest to Lithophyllum in that both genera lack haustoria (unlike Ezo) and are dorsiventrally or radially organized (unlike Tenarea). The long-held practice of citing stratified elongate cells in Titanodermato segregate it from Lithophyllum has been questioned (Woelkerling et al 1985).

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=32990

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 20 January 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 03 December 2024