Spyridiaceae J., 1851: vii, 337 'Ordo Spridieae'.
Type of name: Spyridia Harvey 1833
Source: Choi, H.-G., Kraft, G.T., Kim, H.-S., Guiry, M.D. & Saunders, G.W. (2008). Phylogenetic relationships among lineages of the Ceramiaceae (Ceramiales, Rhodophyta) based on nuclear small subunit rDNA sequence data. Journal of Phycology 44: 1033-1048.
Original publication: Agardh, J.G. (1851). Species genera et ordines algarum, seu descriptiones succinctae specierum, generum et ordinum, quibus algarum regnum constituitur. Volumen secundum: algas florideas complectens. Part 1. pp. [i]-xii, -336 + 337-351 [Addenda and Indices]. Lundae [Lund]: C.W.K. Gleerup.
Plants erect, uniaxial, radially branched. Each axial cell bearing an indeterminate branch, from each cell of which one or more determinate branchlets (ramelli) develop laterally or in whorls, the ramelli unbranched and monosiphonous but encircled at each node by narrow bands of cortication that leave the bulk of their axial cells exposed. Primary axes and indeterminate laterals completely corticated, without internodal spaces. Gland cells absent. Cells multinucleate. Gametophytes dioecious; male gametophytes forming confluent cylinders of spermatangia around several successive cells of monosiphonous laterals. Carpogonial branches four-celled, borne singly on one of two or three periaxial cells in each fertile segment on small uncorticated lateral branchlets with restricted growth, each periaxial cell forming an auxiliary cell on fertilization but bearing no sterile cells. Two or three connecting cells arising on the hypogynous cell, fusing with usually two auxiliary cells. Carposporophyte surrounded by pericarpic filaments developed from the segments above and below the fertile-axial cell, cystocarps nonostiolate. Tetrasporangia tetrahedrally divided, sessile on corticating nodal cells of ramelli, naked, and mostly adaxial.
Linking to this page: http://www.algaebase.org/browse/taxonomy/detail/?taxonid=89761
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 10 December 2018.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:89761