Saprolegnia milnae (Saprolegniales, Straminipila), a new species from an Argentine river (Tierra del Fuego Province, Argentina)

Saprolegnia milnae is described from litter (floating dead twigs, leaves, and roots) in the Milna River, Ushuaia Department, Tierra del Fuego Province (Argentina). The new species is illustrated and compared with other species of the genus. Distinguishing characteristics of S. milnae are the production of smooth oogonia and predominantly contorted androgynous antheridial branches, and also monoclinous and diclinous ones. The oogonial stalks are predominantly bent, curved or once coiled; oospores are subcentric, (1—)3—23(—40) per oogonium, and are variable in size, reaching a diameter of up to 60 μm.Instituto de Botánica "Dr. Carlos Spegazzini

Saprolegnia milnae (Saprolegniales, Straminipila), a new species from an Argentine river (Tierra del Fuego Province, Argentina)

Saprolegnia milnae is described from litter (floating dead twigs, leaves, and roots) in the Milna River, Ushuaia Department, Tierra del Fuego Province (Argentina). The new species is illustrated and compared with other species of the genus. Distinguishing characteristics of S. milnae are the production of smooth oogonia and predominantly contorted androgynous antheridial branches, and also monoclinous and diclinous ones. The oogonial stalks are predominantly bent, curved or once coiled; oospores are subcentric, (1—)3—23(—40) per oogonium, and are variable in size, reaching a diameter of up to 60 μm.Instituto de Botánica "Dr. Carlos Spegazzini

A new freshwater species of Achlya from Tierra del Fuego Province, Argentina

Achlya ambispora sp. nov. occurring on litter (floating dead leaves and twigs) in Las Cotofla stream, Tierra del Fuego Province, Argentina, is described and illusbated and cornpared with similar species. The species produces principally androgynous and monoclinous, rarely diclinous antheridial branches; oogonial wall and oospores are distinctly yellowish at maturity and differ from other species in having also 1–6(-22) centric-subcentric oospores, in oogonia somethes apiculate, that are frequently intercalary or proliferate in chains.Instituto de Botánica "Dr. Carlos Spegazzini

Achlya spiralis, a new aquatic oomycete with bent oogonial stalks, isolated from the Burgundian region of France

Achlya spiralis sp. nov. was isolated from water samples collected in the river Tille in the Burgundian region of France. The new oomycete is described, illustrated and compared with related species of the genus Achlya. It is characterized by the presence of smooth-walled oogonia that are usually borne on bent or twisted oogonial stalks; mainly monoclinous, androgynous and diclinous antheridial branches and eccentric oospores which generally do not mature or mature after a long period of time. The internal transcribed spacer (ITS) region of its rRNA is comprised of 671 bases. The taxonomic description of this new species, its comparison with related oomycetes and the sequence of the ITS region of its rRNA are discussed here.Instituto de Botánica "Dr. Carlos Spegazzini

Achlya spiralis, a new aquatic oomycete with bent oogonial stalks, isolated from the Burgundian region of France

Achlya spiralis sp. nov. was isolated from water samples collected in the river Tille in the Burgundian region of France. The new oomycete is described, illustrated and compared with related species of the genus Achlya. It is characterized by the presence of smooth-walled oogonia that are usually borne on bent or twisted oogonial stalks; mainly monoclinous, androgynous and diclinous antheridial branches and eccentric oospores which generally do not mature or mature after a long period of time. The internal transcribed spacer (ITS) region of its rRNA is comprised of 671 bases. The taxonomic description of this new species, its comparison with related oomycetes and the sequence of the ITS region of its rRNA are discussed here.Instituto de Botánica "Dr. Carlos Spegazzini

Saprolegnia milnae (Saprolegniales, Straminipila), a new species from an Argentine river (Tierra del Fuego Province, Argentina)

Saprolegnia milnae is described from litter (floating dead twigs, leaves, and roots) in the Milna River, Ushuaia Department, Tierra del Fuego Province (Argentina). The new species is illustrated and compared with other species of the genus. Distinguishing characteristics of S. milnae are the production of smooth oogonia and predominantly contorted androgynous antheridial branches, and also monoclinous and diclinous ones. The oogonial stalks are predominantly bent, curved or once coiled; oospores are subcentric, (1—)3—23(—40) per oogonium, and are variable in size, reaching a diameter of up to 60 μm.Instituto de Botánica "Dr. Carlos Spegazzini

Micobiota parásita de ambientes acuáticos de la provincia de Buenos Aires

Fil: Steciow, Mónica Mirta. Instituto de Botánica Spegazzini, 53 nro. 477, 1900 La Plata, Buenos Aires, ArgentinaFil: Marano, Agostina Virginia. Instituto de Botánica Spegazzini, 53 nro. 477, 1900 La Plata, Buenos Aires, Argentin

A new species of Saprolegnia (Saprolegniales, Straminipila), from a polluted Argentine channel

Saprolegnia variabilis sp. nov. is described from litter (floating twigs, leaves, and roots) in a artificial polluted channel, near a petroleum refinery, in Buenos Aires Province, Argentina. The species is illustrated and compared with other species of the genus. It differs from S. australis in having mature subcentric oospores; the oogonia and the oospores are larger and more variable in shape and size, and the number of oospores is greater. The oogonial stalks are also variable in length and the zoosporangia are very much longer.Instituto de Botánica "Dr. Carlos Spegazzini

A. robusta sp. nov., a new species of Achlya (saprolegniales, straminipila) from a polluted argentine channel

Achlya robusta sp. nov. was found on litter (floating twigs, leaves, and roots) in an artificial polluted channel, near a petroleum refinery, in Buenos Aires province, Argentina. The species is described, illustrated and compared with other species of the genus. A. robusta produces mainly smooth and papillate, tuberculate or bullate oogonia and monoclinous antheridial branches. It develops spherical and subglobose oogonia, with the oogonial wall yellowish and containing mainly immature oospheres. The oospores are eccentric and ranging from (1) 4-17 (30) per oogonium.Instituto de Botánica "Dr. Carlos Spegazzini

A new freshwater species of Achlya from Tierra del Fuego Province, Argentina

Achlya ambispora sp. nov. occurring on litter (floating dead leaves and twigs) in Las Cotofla stream, Tierra del Fuego Province, Argentina, is described and illusbated and cornpared with similar species. The species produces principally androgynous and monoclinous, rarely diclinous antheridial branches; oogonial wall and oospores are distinctly yellowish at maturity and differ from other species in having also 1–6(-22) centric-subcentric oospores, in oogonia somethes apiculate, that are frequently intercalary or proliferate in chains.Instituto de Botánica "Dr. Carlos Spegazzini