152,876 species and infraspecific names are in the database, 20,938 images, 59,117 bibliographic items, 408,264 distributional records.

Tylotus J.Agardh, 1876

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Gigartinales
Family Dicranemataceae

Holotype species: Tylotus obtusatus (Sonder) J.Agardh

Original publication and holotype designation: Agardh, J.G. (1876). Species genera et ordines algarum, seu descriptiones succinctae specierum, generum et ordinum, quibus algarum regnum constituitur. Volumen tertium: de Florideis curae posteriores. Part 1. pp. [ii*-iii*], [i]-[viï], [1]-724. Lipsiae [Leipzig]: C.W.K. Gleerup.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Kraft, G.T. (1977). Studies of marine algae in the lesser-known families of the Gigartinales (Rhodophyta). II. The Dicranemaceae. Australian Journal of Botany 25: 219-267, 20 figs.

Description: Fronds reach 15 cm in length and are procumbent, strap-shaped and subdichotomous. Thalli are anchored by haptera arising from the undersurface of the lower thallus. Male and female gametangia are restricted to opposite sides of the fronds. The female apparatus is procarpial, the 3-celled carpogonial branches borne on large inner cortical cells that become the auxiliary cells following direct fusion with the carpogonium. Fusion cells initiate lateral gonimoblasts that develop outwardly into a hemispherical placenta connected to gametophytic vegetative cells at the base of the cystocarp chamber. Single and terminal carposporangia form across the convoluted upper surface of the carposporophyte. Tetrasporangia are nemathecial and develop both at the outer ends or internally on elongate parallel filaments.

Information contributed by: G.T. Kraft & M.D. Guiry. The most recent alteration to this page was made on 23 Aug 2012 by Michael Guiry.

Comments: Distribution: The type species occurs on rocks from shallow subtidal to 10 m depths along western and southern Australia. Tylotus lichenoides Okamura, is endemic to southern Japan, but is not known in sufficient detail to determine its generic placement. It is likely that the genus is endemic to Australia.

Numbers of names and species: There are 11 species names in the database at present, of which 3 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.

References
Kraft, G.T. (1977). Studies of marine algae in the lesser-known families of the Gigartinales (Rhodophyta). II. The Dicranemaceae. Australian Journal of Botany 25: 219-267, 20 figs.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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.

Created: 01 January 2001 by M.D. Guiry

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Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=34990

Citing AlgaeBase
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 18 September 2018.

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