Approuve le 23 mai 1974 REISINGER, O., et G. M. OLAH. 1974. Etude ultrastructurale et cytochimique de la conidiogenbe chez Bearrveria bassiana. Can. 3. Microbiol. 20: 1387-1392. L'aspect ultrastructural et cytochimique de la conidiogenese chez Beauveria bassiar~a (Bals.) Vuill. ffit etudie afin de pouvoir mieux comprendre le mecanisme d'initiation du primordium et mettre en evidence par I'analysecytochimique les constituants polysaccharidiques et proteiniques de I'enveloppe conidienne. Nous essayons ainsi de localiser et evaluer I'importance des con~poses selon nos donnees ultrastructurales reunies, durant la phase de multiplication asexuee chez ce champignon. C'est dans cet optique que la cellule sporogene, la conidiogenese, la maturation de la structure et la liberation des conidies ont t t t examinees. REISINGER, O., and G. M. OLAH. 1974. Etude ultrastructurale et cytochimique de la conidiogenese chez Bea~rveria bassiana. Can. 3. Microbiol. 20: 1387-1392. The ultrastructural and cytochemical aspects of conidiation in Beauveria bassiar~a (Bals.)Vuill. were studied to elucidate the mechanism of primordium initiation, and to show, by cytochemical analysis, the constituents of conidial walls in terms of polysaccharides and proteins. During the stage of asexual reproduction in this fungus, studies were conducted to localize and quantitate compounds in correlation with data on ultrastructural composition. Therefore we have examined the mother cell forming spores, the conidiation, the structure maturation, and the release of conidiation.[Journal translation]

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The observation with the electron microscope of specimens during conidium initiation reveals the enteroblastic nature of the conidial prefiguration. The morphological characteristics expressed during the other stages of conidiogenesis (conidium maturation and propagule liberation) are also studied. The cytochemical techniques (showing the presence of polysaccharidic and proteinic substances) confirm our conclusions on the nature of the newly formed primary sporal envelope and show an identical wall structure whatever the organ studied.A comparison with the functioning of other types of phialides is made and a relationship between the phialoconidiogenesis (Phialophora richardsiae (Nannf.) Conant.) and the annello-conidiogenesis (Doratomyces purpureofuscus), based on the similarity of conidium initiation mechanisms, is accepted.

Several studies have demonstrated the importance of physical, chemical and microbiological properties of compost on Agaricus bisporus growth and yield. However, to our knowledge, no experimentation has been conducted to determine the effect of storage on the properties of spawned compost. For this study, our objective was to compare the properties of spawned compost stored under different temperature regimes. The microflora and, the chemical and physical properties of prespawned compost pressed in shrink wrapped blocks were first determined and mushroom yield evaluated. Subsequently, composts that had been stored at 4°C, 15°C, 24°C for 10 and 14 days were analysed for the same variables. Our results showed that storage temperature affected some properties of compost but these changes did not affect mushroom yield.