Lithoporella () , 1909
Lectotype species: Lithoporella melobesioides (Foslie) Foslie
Original publication:Foslie, M. (1909). Algologiske notiser VI. Kongelige Norske Videnskabers Selskabs Skrifter 1909(2): 1-63.
Type designated in Ishijima, W. (1954). Cenozoic coralline algae from the western Pacific. pp. 1-87. Tokyo: Yuhodo Company.
Taxonomic status: currently recognized as a distinct genus.
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.
Description: Thalli comprising loosely attached crusts <200 um thick and 2-3 (-5) cells thick lacking protuberances; often overgrowing one another, or unattached. Haustoria lacking. Organized in two types of filaments (dimerous), the first-order filaments (primigenous filaments) forming a unistratose layer of elongate cells (palisade cells) and the second-order filaments (postigenous filaments) growing from the first-order filaments and oriented about at right angles to the substrate. Second-order filaments sometimes consisting only of small epithallial cells (in which case thallus is 2 cells thick). Outermost walls of epithallial cells rounded or flattened, not flared. Cells in contiguous filaments sometimes joined by fusions; secondary pit-connections unknown. Trichocytes sometimes present singly or in groups; present as terminal cells of filaments or arising from cells in first-order filaments. Reproductive cells forming within protruding uniporate conceptacles. Roofs of tetrasporangial conceptacles produced from filaments interspersed among sporangia. Apical sporangial plugs absent. Bisporangia not reported. Sexual plants dioecious. Roofs formed by overarching filaments from around the developing gametangia. Carpogonia and spermatangia produced on the floors of the chambers.
Information contributed by: H.W. Johansen. The most recent alteration to this page was made on 20 Jan 2017 by M.D. Guiry.
Comments: Because species concepts in Lithoporella have not been elucidated the distribution of the genus is not known. Lithoporella and Mastophora appear to be the most closely related genera in the Mastophorioideae, and vegetatively there appear to be no significant differences. However, the roofs of tetrasporangial conceptacles in Lithoporella form from filaments interspersed among the sporangia and a columella is lacking. On the other hand, in Mastophora the roofs are produced by filaments surrounding the fertile cells, and a central sterile columella is present.
Numbers of names and species: There are 9 species names in the database at present, as well as 1 infraspecific names. Of the species names, 6 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..
Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):
Click here to also show infraspecific names in the list below.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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.
Created: 28 December 2000 by M.D. Guiry
Verified by: 20 January 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42553
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 18 October 2019.