156,039 species and infraspecific names are in the database, 21,990 images, 60,314 bibliographic items, 442,784 distributional records.

Mastophoropsis Woelkerling, 1978

Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Corallinophycidae
Order Hapalidiales
Family Hapalidiaceae
Subfamily Melobesioideae

Holotype species: Mastophoropsis canaliculata (Harvey) Woelkerling

Original publication and holotype designation: Woelkerling, W.J. (1978). Mastophoropsis canaliculata (Harvey in Hooker) gen. et comb. nov. (Corallinaceae, Rhodophyta) in southern Australia. British Phycological Journal 13: 209-225.

Precise date of publication

1 September 1978 (stated on journal issue cover and on first page of article). The requirements for valid publication are specified in the ICBN (International Code of Botanical Nomenclature).

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.

Taxonomic notes
The ICBN rules cited below are those adopted by the Seventeenth International Botanical Congress, Vienna, Austria, July 2005 (McNeill et al. 2006).

In accordance with ICBN Art 13.3, the name Mastophoropsis is treated as pertaining to a non-fossil taxon because its type is based on a non-fossil specimen. No species based on fossil types have been assigned to the genus to date.

The generic name Mastophoropsis is typified (ICBN Art 10.1) by the type of M. canaliculata, the only species originally included in the genus. - (21 Jul 2009) -

Description: Plants calcified, lacking genicula, entirely pseudoparenchymatous; growth-form arborescent; composed of a basal holdfast and erect stipes bearing flexible ribbon-like branches that commonly have vein-like thickenings in older portions; growing attached to rocky substrates; haustoria unknown.

Thallus organization generally dorsiventral with conceptacles produced only on the dorsal surfaces of the ribbon-like branches; thallus construction monomerous throughout, consisting of a single system of branched laterally coherent filaments that contribute to a central core and a peripheral region where portions of core filaments or their derivatives curve outwards towards dorsal and ventral thallus surfaces; coaxial growth (in which cells of adjacent filaments in core region are aligned in arching tiers) not recorded; vein-like thickenings arising secondarily in older parts of branches, presumably from subepithallial initials. Most filaments usually terminating at thallus surface in conspicuous epithallial cells (one per filament); outermost walls of epithallial cells slightly rounded to flattened but not flared at the corners; cell elongation occurring mainly behind actively dividing subepithallial initials that are as short as or shorter than their immediate inward derivatives. Cells of adjacent filaments linked by cell fusions (best seen in transverse sections); secondary pit-connections unknown.

Gametangia and carposporangia developing in uniporate conceptacles. Spermatangia (male gametangia) and carpogonia (female gametangia) presumably produced in separate conceptacles; male and female conceptacles formed on different plants (so far as known). Spermatangia formed (so far as known) on unbranched filaments that arise from the conceptacle chamber floor and roof; spermatangial initials not seen and occurrence of overlaying protective cells not determined; spermatangial conceptacle roof formation apparently occurring centripetally from groups of vegetative filaments peripheral to the spermatangial filaments. Carpogonial stages unknown. Carposporophytes developing in conceptacles after presumed fertilization; mature carposporophytes apparently composed of an inconspicuous central fusion cell and several-celled filaments bearing terminal carposporangia.

Tetrasporangia formed in conceptacles on separate plants from gametangia and carposporangia. Roofs of tetrasporangial/bisporangial conceptacles multiporate and composed of cells. Tetrasporangia each containing four zonately arranged spores and producing an apical plug that blocks a roof pore before spore release. Bisporangia unknown.

Information contributed by: Wm. J. Woelkerling. The most recent alteration to this page was made on 5 Oct 2010 by M.D. Guiry.

Characters considered diagnostic of Mastophoropsis: Mastophoropsis is the only known genus of Hapalidiaceae, Subfamily Melobesioideae in which the thallus is arborescent and composed of a basal holdfast and erect stipes bearing flexible ribbon-like branches.

Characters considered diagnostic of higher taxonomic ranks known/presumed to occur in all species of Mastophoropsis: 1) calcification in the form of calcite; 2) pit plugs with two cap layers at cytoplasmic faces, the outer cap dome shaped; membrane absent; 3) cell walls impregnated with calcite; 4) gametangia and carposporangia produced within uniporate conceptacles; 5) tetrasporangia/bisporangia produced within conceptacles and possessing zonately arranged spores; 6) tetrasporangial/bisporangial conceptacles possessing multiporate plates or roofs; 7) tetrasporangia/bisporangia producing apical plugs; 8) tetrasporangial/bisporangial conceptacles with multiporate roofs composed of cells; lacking an acellular multiporate plate recessed below a single outer opening; and 9) cells of contiguous vegetative filaments linked exclusively by cell fusions. Characters 1-2 are considered diagnostic of the Corallinophycidae, 3-5 of the Corallinales, 6-7 of the Hapalidiaceae, and 8-9 of the Melobesioideae.

Comments: Information on the taxonomic history, nomenclature, and other matters associated with the name Mastophoropsis is contained in Woelkerling (1988: 180-185). Growth form terminology follows Woelkerling et al. (1993).

Data on the lectotype specimen of M. canaliculata, the type and only known species of Mastophoropsis,is presented in Woelkerling (1978), who also gave an account of the species; additional morphological/anatomical data on the species are provided in Woelkerling (1988: 180-185) and in Woelkerling (1996: 173-177). There is no information for the genus at present on carpogonial stages or on spermatangial initials & the possible occurrence of ‘protective cells’ overlying them. Few mature spermatangial conceptacles are known, and according to Woelkerling (1996: 177) there is some uncertainty as to whether at least some spermatangial filaments might be branched. The mode of spermatangial conceptacle roof development is inferred from sections of two mature male conceptacles (Woelkerling 1988: 184, fig. 221; Woelkerling 1996: 176, fig. 74D).

Biogeographically, Mastophoropsis presently is known only from the southern coast of Australia (South Australia, Victoria and Tasmania).

The lists below of diagnostic characters of Mastophoropsis, and of the higher taxa to which it belongs, are derived from data in Woelkerling (1978, 1988, 1996), Harvey, Broadwater, Woelkerling & Mitrovski (2003), Harvey, Woelkerling & Millar (2003), Le Gall & Saunders (2007), Woelkerling et al. (2008: 282) and/or Le Gall et al. (2009). Diagnostic characters are those that taken together distinguish a taxon from others of the same taxonomic rank (e.g. characters distinguishing Mastophoropsis from other genera of the Hapalidiaceae, subfamily Melobesioideae). Harvey, Woelkerling & Millar (2003: 653) also provide a diagnostic comparison of Mastophoropsis with other currently recognized non-fossil genera of Melobesioideae.

Numbers of names and species: There is only one species or infraspecific name in the database at present, which has 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.

Harvey, A.S., Broadwater, S.T., Woelkerling, W.J. & Mitrovski, P.J. (2003). Choreonema (Corallinales, Rhodophyta): 18S rDNA phylogeny and resurrection of the Hapalidiaceae for the subfamilies Choreonematoideae, Austrolithoideae and Melobesioideae. Journal of Phycology 39: 988-998.

Harvey, A.S., Woelkerling, W. J. & Millar, A.J.K. (2003). An account of the Hapalidiaceae (Corallinales, Rhodophyta) in south-eastern Australia. Australian Systematic Botany 16: 647-698.

Harvey, A.S., Woelkerling, W.J. & Millar, A.J.K. (2009). The genus Amphiroa (Lithophylloideae, Corallinaceae, Rhodophyta) from the temperate coasts of the Australian continent, including the newly described A. klochkovana. Phycologia 48: 258-290.

Harvey, W.H. (1859). Algae. Part III. Flora Tasmaniae. In: The botany of the Antarctic voyage of H.M. discovery ships Erebus and Terror, in the years 1839-1843, under the command of Captain Sir James Clark Ross...Part III. Flora Tasmaniae. Monocotyledones and Acotyledones. (Hooker, J.D. Eds) Vol. II, pp. 282-343. London: Lovell Reeve.

Le Gall, L., Payri, C.E., Bittner, C.E., & Saunders, G.W. (2010). Multigene polygenetic analyses support recognition of the Sporolithales, ord. nov. Molecular Phylogenetics and Evolution 54(1): 302-305.

Le Gall, L. & Saunders, G.W. (2007). A nuclear phylogeny of the Florideophyceae (Rhodophyta) inferred from combined EF2, small subunit and large subunit ribosomal DNA: establishing the new red algal subclass Corallinophycidae. Molecular Phylogenetics and Evolution 43: 1118-1130.

McNeill, J., Barrie, F.R., Burdet, H.M., Demouline, V., Hawksworth, D.L., Marhold, K., Nicolson, D.H., Prado, J., Silva, P.C., Skog, J.E., Wiersema, J.H. & Turland, N.J. (2006). International Code of Botanical Nomenclature (Vienna Code) adopted by the Seventeenth International Botancial Congress Vienna, Austria, July 2005. pp. [i-iv], v-xviii + 1-568. Liechtenstein: A.R.G. Gantner Verlag.

Stafleu, F.A. & Cowan, R.S. (1979). Taxonomic literature... Volume II: H-Le. Vol. 98 pp. XVIII + 991. Utrecht: Bohn, Scheltema & Holkema.

Woelkerling, W.J. (1978). Mastophoropsis canaliculata (Harvey in Hooker) gen. et comb. nov. (Corallinaceae, Rhodophyta) in southern Australia. British Phycological Journal 13: 209-225.

Woelkerling, W.J. (1988). The Coralline Red Algae: an analysis of the genera and subfamilies of nongeniculate Corallinaceae. pp. i-xi, 1-268, 259 figs, tables numbered by chapter. London & Oxford: British Museum (Natural History) & Oxford University Press.

Woelkerling, W. J. (1996). Subfamily Melobesioideae. In: The Marine Benthic Flora of Southern Australia - Part IIIB. Gracilariales, Rhodymeniales, Corallinales and Bonnemaisoniales. (Womersley, H.B.S. Eds), pp. 164-210. Canberra: Australian Biological Resources Study.

Woelkerling, W.J. & Harvey, A.S. (1996). Subfamily Austrolithoideae. In: The marine benthic flora of Southern Australia – Part IIIB. Gracilariales, Rhodymeniales, Corallinales and Bonnemaisoniales . (Womersley, H.B.S. Eds), pp. 160-163. Canberra: Australian Biological Resources Study.

Woelkerling, W.J., Millar, A.J.K., Harvey, A. & Baba, M. (2008). Recognition of Pachyarthron and Bossiella as distinct genera in the Corallinaceae, subfamily Corallinoideae (Corallinales, Rhodophyta). Phycologia 47: 265-293.

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

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Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 23 August 2019.

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