Abstract
The zoospores and isogametes ofUlvaria obscura var.blyttii, the isogametes ofMonostroma bullosum, and the anisogametes ofM. grevillei have a flagellar apparatus with counterclockwise absolute orientation and terminal caps, and therefore belong to theUlvophyceae. On the basis of the absence or presence of body scales and the morphologies of certain flagellar apparatus components,Ulvaria obscura var.blyttii is retained in theUlvales, whileM. bullosum, M. grevillei andM. oxyspermum are referred to theUlotrichales. Differences in scale morphology, certain flagellar apparatus components, and early thallus ontogeny support the transfer ofM. oxyspermum to the genusGayralia. Mating structures and their positional relationships within the cell are described from the gametes examined. A plasmalemma-associated plaque that may be a degenerate mating structure occurs in someG. oxysperma motile cells.
Similar content being viewed by others
References
Bliding, C., 1968: A critical survey of European taxa inUlvales II. — Bot. Not.121, 535–629.
Bold, H. C., Wynne, M. J., 1978: Introduction to the Algae: Structure and Reproduction. — Englewood Cliffs, New Jersey: Prentice-Hall.
Chapman, V. J., Chapman, D. J., 1973: The Algae. 2 ed. — London: MacMillan.
Dube, M. A., 1967: On the life history ofMonostroma fuscum (Postels etRuprecht)Wittrock. — J. Phycol.3, 64–73.
Floyd, G. L., Hoops, H. J., Swanson, J. A., 1980: Fine structure of the zoospore ofUlothrix belkae with emphasis on the flagellar apparatus. — Protoplasma104, 17–31.
Gayral, P., 1962: Reproduction et dévelopement deMonostroma obscurum (Kütz.)J. Ag. — Bull. Soc. Bot. Fr.109, 53–59.
—, 1964: Sur le démembrement de l'actuel genreMonostroma Thuret (Chlorophycées,Ulotrichales s.l.). — C. R. Acad. Sci. (Paris)258, 2149–2152.
—, 1965:Monostroma Thuret;Ulvaria Ruprecht emend.Gayral;Ulvopsis Gayral (Chlorophycées,Ulotrichales): structure, reproduction, cycles, position systématique. — Rev. Gén. Bot.72, 627–638.
Hoops, H. J., Floyd, G. L., Swanson, J. A., 1982: Ultrastructure of the biflagellate motile cells ofUlvaria oxysperma (Kütz.)Bliding and phylogenetic relationships among ulvaphycean algae. — Amer. J. Bot.69, 150–159.
Hori, T., 1973: Comparative studies of pyrenoid ultrastructure in algae of theMonostroma complex. — J. Phycol.9, 190–199.
Kapraun, D. F., Flynn, E. H., 1973: Culture studies ofEnteromorpha linza (L.)J. Ag. andUlvaria oxysperma (Kützing)Bliding (Chlorophyceae, Ulvales) from Central America. — Phycologia12, 145–152.
Kornmann, P., 1963: DieUlotrichales, neu geordnet auf der Grundlage entwicklungsgeschichtlicher Befunde. — Phycologia3, 60–68.
—, 1964: ÜberMonostroma bullosum (Roth)Thuret undM. oxyspermum (Kütz.)Doty. — Helgol. Wiss. Meeresunters.11, 13–21.
Lee, R. E., 1980: Phycology. — Cambridge: Cambridge University Press.
Lokhorst, G. M., Vroman, M., 1974: Taxonomic studies on the genusUlothrix (Ulotrichales, Chlorophyceae). III. — Acta Bot. Neerl.23, 561–602.
Melkonian, M., 1979: Structure and significance of cruciate flagellar root system in green algae: zoospores ofUlva lactuca (Ulvales, Chlorophyceae). — Helgol. Wiss. Meeresunters.32, 425–435.
—, 1980: Flagellar roots, mating structure and gametic fusion in the green algaUlva lactuca (Ulvales). — J. Cell Sci.46, 149–169.
Moestrup, Ø., 1978: On the phylogenetic validity of the flagellar apparatus in green algae and other chlorophyll a and b containing plants. — BioSystem10, 117–144.
O'Kelly, C. J., Floyd, G. L., 1983: The flagellar apparatus ofEntocladia viridis motile cells, and the taxonomic position of the resurrected familyUlvellaceae (Ulvales, Chlorophyta). — J. Phycol.19, 153–164.
Papenfuss, G. F., 1960: On the genera of theUlvales and the status of the order. — J. Linn. Soc. (Bot.)56, 303–318.
Parke, M., Dixon, P. S., 1976: Check-list of British marine algae—third revision. — J. Mar. Biol. Assoc. U. K.56, 527–594.
Robenek, H., Melkonian, M., 1981: Comparative ultrastructure of eyespot membranes in gametes and zoospores of the green algaUlva lactuca (Ulvales). — J. Cell. Sci.50, 149–164.
Sluiman, H. J., Roberts, K. R., Stewart, K. D., Mattox, K. R., 1980: Comparative cytology and taxonomy of theUlvaphyceae. I. The zoospore ofUlothrix zonata (Chlorophyta). — J. Phycol.16, 537–545.
Stafleu, F. A., & al. (Ed.), 1978: International Code of Botanical Nomenclature, Leningrad, 1975. — Regnum Veget.97. — Utrecht: Bohn, Scheltema & Holkema.
Starr, R. C., 1978: The culture collection of algae at the University of Texas at Austin. — J. Phycol.14, (suppl.), 47–100.
Stewart, K. D., Mattox, K. R., 1975: Comparative cytology, evolution and classification of the green algae, with some consideration of the origin of other organisms with chlorophylls a and b. — Bot. Rev.41, 104–135.
Stuessy, C. L., Floyd, G. L., O'Kelly, C. J., 1983: Fine structure of the zoospores of anEnteromorpha species collected from fresh water. — Brit. Phycol. J.18, 249–257.
Vinogradova, K. L., 1969: K sistematike porjadkaUlvales (Chlorophyta). — Bot. Žurn.54, 1347–1355.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
O'Kelly, C.J., Floyd, G.L. & Dube, M.A. The fine structure of motile cells in the generaUlvaria andMonostroma, with special reference to the taxonomic position ofMonostroma oxyspermum (Ulvophyceae, Chlorophyta). Pl Syst Evol 144, 179–199 (1984). https://doi.org/10.1007/BF00984132
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00984132