Tylotus J.Agardh, 1876
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. Epicrisis systematis Floridearum. pp. [ii*-iii*], [i]-[viï], [1]-724. Lipsiae [Leipzig]: apud T.O. Weigel.
Request PDFDescription: 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 2012-08-23 by Michael Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
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.
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.
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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,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=34990
Citing AlgaeBase
Cite this record as:
Michael Guiry in Guiry, M.D. & Guiry, G.M. 23 August 2012. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024
