Leptofauchea Kylin, 1931
Holotype species: Leptofauchea nitophylloides (J.Agardh) Kylin
Original publication and holotype designation: Kylin, H. (1931). Die Florideenordnung Rhodymeniales. Lunds Universitets Årsskrift, Ny Följd 27(11): 1-48, 8 figs, 20 pls.
Request PDFDescription: Thallus erect with flattened, regularly dichotomously branched, fronds. Construction multiaxial, cortex of a single layer of small pigmented cells. Medulla of 1-2(-4) layers of large colourless cells. Spermatangial plants unknown.Carpogonial branches unknown; gonimoblast developing outwards, most cells forming carposporangia.Cystocarps ostiolate, marginal or scattered, not coronate, protruding outwards, tela arachnoidea present. Tetrasporangia in scattered sori. Spores regularly cruciately arranged. Nothing is known of the life history of Leptofauchea species, but it is likely to be of the ‘Polysiphonia-type.’
Information contributed by: M.D. Guiry. The most recent alteration to this page was made on 2021-08-23 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Comments: Kylin (1931) described Leptofauchea based on L. nitophylloides (J. Agardh) Kylin from Port Jackson, Australia, and distinguished it from Fauchea on the basis of its regularly dichotomously branched fronds, its single-layered cortex, and a medulla with one or two layers of large cells.Four further species have been described. Hawkes and Scagel (1986: 1577) examined the type material of L. pacifica Dawson (1944) and referred it to Fauchea fryeana Setchell.
Joly (1957, 1965) described the tetrasporangia of L. brasiliensis Joly as being tetrahedrally divided, but his illustration (Joly 1957, pl. 19: fig. 4) shows tetrasporangia with several modes of division, including cruciate and decussate; the size (12-14 µm in diameter) of these is more typical of, for example, the Phyllophoraceae, rather than the Rhodymeniaceae, and the sporangia are borne terminally on nemathecoid filaments.>In the absence of a description of the structure of the cystocarp of L. brasiliensis (Joly 1965: 170) this species must be regarded as doubtfully belonging to the genus.There would appear to be no collections of L. auricularis E.Y. Dawson (1963: 445) from Pacific Baja California other than the type, which Hawkes and Scagel (1986: 1577) could not locate.
Leptofauchea rhodymenioides W.R. Taylor (1942: 114) from the Netherlands Antilles and southeastern United States shows a cortex 1-2 cells in thickness, but there are 2-3+ cell layers in the medulla.
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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.
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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 23 August 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024
