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L'utérus cloisonné est la malformation utérine la plus fréquente, comptant pour 30 à 50% des cas, suivie par les malformations utérines de type utérus bicorne et utérus unicorne. Nous rapportons un cas d'utérus cloisonné total suspecté lors de l'examen obstétrical d'une parturiente en travail, et confirmé à l'exploration au cours d'une césarienne réalisé pour le même motif. L'intérêt de ce cas est de montrer le pronostic obstétrical chez les femmes fertiles porteuses de cette malformation utérine.

La fréquence des malformations utérines ayant un impact sur la reproduction est difficile à apprécier. Leur mise en évidence nécessite un bilan spécifique (hystérosalpingographie, hystéroscopie, cœlioscopie). La fertilité spontanée peut être altérée en fonction du type d'anomalie utérine. Toutes ces anomalies peuvent avoir des répercussions sur l’évolution de la conception à type de fausses couches précoces et tardives, de grossesse extra utérine, de menace d'accouchement prématuré, d'accouchement prématuré, de pathologies vasculaires gravidiques et de retard de croissance intra-utérin. L'utérus bicorne est la plus connue des malformations et représente environ la moitié des anomalies de l'utérus. La survenue d'une telle grossesse constitue une situation à risque pouvant entraîner une mort maternelle, mais le diagnostic précoce et un bon suivi peut mener des grossesses à terme sur des utérus malformé. Le dépistage échographique devrait permettre la détection systématique de ce genre de cas afin de prendre préventivement les mesures qui s'imposent. Nous rapportons un cas de rupture utérine sur utérus bicorne unicervical sur grossesse à 12 semaines d'aménorrhée.

Three species of Ceratobasidium, C. bicorne Eriksson & Ryvarden, C. cornigerum (Bourdot) D.P. Rogers and C. pseudocornigerum M.P. Christensen, and two species of Oliveonia, O. fibrillosa (Burt) Donk and O. pauxilla (H.S. Jacks.) Donk, are reported from Finland. Ceratobasidium cornigerum and O. fibrillosa are reported for the first time. The most widespread species seems to be C. cornigerum, whereas C. pseudocornigerum gives an impression of southern distribution and the Oliveonia species are very rare. The anamorph of Ceratobasidium bicorne Eriksson & Ryvarden is commonly isolated from conifer seedlings, but for the present no basidiocarps are observed. The substrates of the telemorphs are listed, the species are illustrated and a few reference collections from Russia were studied.

Strains of Ceratobasidium bicorne (anamorph uninucleate Rhizoctonia), causing root dieback in nursery-grown conifer seedlings, were fruited in the laboratory and the pairing interactions among sibling, single-basidiospore progeny were investigated. No mating reactions were observed. Instead, a high frequency of somatic incompatibility was observed in progeny pairings, indicated by a killing reaction in hyphal anastomosis and by formation of a demarcation line. The F1 progeny also could be fruited, and the level of somatic incompatibility within the F2 progeny remained high, even if lower than in the F1 progeny. The interaction types in pairings within a family of progeny were similar in all respects to those between field isolates, indicating that the species is homothallic. The uninucleate condition of vegetative cells and the basidial characteristics would indicate homokaryotic fruiting, but the possibility of pseudohomothallism remains. We currently are not able to provide an explanation for the mechanism promoting somatic incompatibility in this species, but it seems likely that the classic heterogenic model of somatic incompatibility recognized in basidiomycetes is not applicable here. Alternative mechanisms are discussed.

Earlier studies have described how moist, on-shore winds cause meso-scale vegetation patterns on arid mountains near the sea. However, all protruding objects such as trees, micro-relief, and hill slopes influence the distribution of seamist. The influence of the tree-canopy, aspect, and distance to the sea on the field-layer vegetation in montane savanna was investigated on 16 hills in the Red Sea Hills, at 34 - 38 km from the sea. At 32 sites, total field-layer cover, species cover, and species number were estimated in a sub-canopy plot and in a nearby open plot on seaward and leeward slopes. Cover and species number in the understorey are significantly higher than in the open. The difference is highest on seaward slopes. Detrended correspondence analysis reveals short species-axes of ca. 2 SD-units. Differences between plots are mainly in species cover. This fits a principal components ordination model. PCA and its constrained version RDA give concordant results. The explanatory variables, Tree-cover and Relative Radiation Index (aspect), have similar indirect influences on plants, and are significantly correlated with axis 1, which is interpreted as a moisture and temperature gradient. The moist seaward plots show an independent trend in species composition along axis 2, which correlates with distance to the sea. On a presence basis the variables, all representing different spatial separation, correlate on the first axis. Presumably, the species composition, at all spatial scales, is directly or indirectly related to the variation in temperature and moisture.

An analysis of 23 species of Trichomanes s. l. indicates that the presence of C-glycosylflavones, especially mono-C-glycosylflavones, may be a basic characteristic for this genus. Except for the morphologically unique Cardiomanes reniforme, this feature appears to delimit the species of Trichomanes s. l. from those of Hymenophyllum s. l. Several species, primarily those classified within Didymoglossum (according to both Copeland and Morton) synthesize flavone-O-glycosides in addition to their C-glycosylflavone profiles. Two species, T. birmanicum and T. radicans, appear to be unique in synthesizing the di-C-glycosylflavones violanthin and isoviolanthin; five species (T. collariatum, T. scandins, T. birmanicum, T. bicorne, and T. alatum) appear to synthesize di-C-glycosylflavones but lack mono-C-glycosylflavones. Based on this and other studies, it may be appropriate to consider these C-glycosylflavone-producing plants as representing primitive leptosporangiate stock

Samples of Radiolaria were collected in Weddell Sea waters with plankton tows at stations at the ice edge as well as hundreds of kilometers south of the ice edge. Concentrations of polycystine and phaeodarian Radiolaria in this unique data set are low, with abundances comparable to those reported from some less productive open-ocean regions. Polycystine Radiolaria occur in highest concentrations in the upper 100 m of the water column at the ice edge and beneath the sea ice. At the sea-ice stations, intermediate tows (100-200 m) contain the highest abundances of Phaeodaria. Spongotrochus glacialis is the most abundant polycystine present in shallow (0-100 m) and intermediate (100-200 m) tows, with Spongurus pylomaticus and Spongotrochus glacialis occurring in higher concentrations in deep tows (1000-2000 m) than any other polycystine radiolarian. In all the shallow and intermediate tows taken within the sea ice, the most abundant Phaeodaria present is Challengeron bicorne. At the ice edge, Protocystis harstoni replaces C. bicorne as the most commonly found phaeodarian. (Auth.)

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