Lithophyllum Philippi, 1837
Lectotype species: Lithophyllum incrustans Philippi
Original publication: Philippi, R.A. (1837). Beweis, dass die Nulliporen Pflanzen sind. Archiv für Naturgeschichte 3: 387-393, figs 2-6, pl. IX.
Request PDFType designated in: Foslie, M. (1898). Systematical survey of the Lithothamnia. Det Kongelige Norske Videnskabers Selskabs Skrifter 1898(2): 1-7.
Description: Thalli comprising dorsiventral, attached crusts sometimes beset with protuberances, or unattached subglobose masses. Crustose parts consisting of first-order filaments (primigenous filaments) only (monomerous) or both first- and second-order filaments (dimerous), the latter (postigenous filaments) at about right angles to the former. First-order filaments either arranged in decumbent, arching tiers of cells (coaxial anatomy) or curving upward toward the thallus surface (plumose anatomy). Cells in first-order filaments rarely stratified and elongated (palisade cells). Outermost walls of epithallial cells rounded or flattened, not flared. Cells in contiguous filaments often joined by secondary pit-connections; cell fusions absent. Trichocytes present or absent, but if present occurring singly.
Reproductive cells forming within uniporate conceptacles. Tetrasporangial and bisporangial conceptacles sometimes containing columellas. Apical sporangial plugs absent. Gametangia poorly known.
Information contributed by: H.W. Johansen & M.D. Guiry. 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: Woelkerling, W.J. (1988). The Coralline Red Algae: an analysis of the genera and subfamilies of nongeniculate Corallinaceae. pp. i-xi, 1-268, 259 figs, tables numbered by chapter. London & Oxford: British Museum (Natural History) & Oxford University Press.
Comments: Bispores produced instead of tetraspores in some species, e.g., in L. incrustans in the British Isles where the incidence of bispore production increases from south to north and the proportion of sexual plants decreases. Dominating rocky surfaces below 25 m off S. California.
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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,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=95
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 21 November 2024
