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Radial expansion of Pilobolus crystallinus colonies was inhibited by oxygen. The upper limit of pO2 for radial growth was estimated at less than 30 mm Hg. At partial pressures of oxygen greater than 30 mm Hg the fungus only grew beneath the substrate surface and under an oxygen atmosphere (pO2 = 760 mm Hg) growth ceased until respiration created an area of low pO2 (<30 mm Hg) at the hyphal tips. Growth as measured by dry weight changes, however, was favored by aeration. Oxygen inhibits extension of hyphal tips which in turn effects vertical organization of the colony, but this fungus probably is not microaerophilic.
Mycologia, the official journal of the Mycological Society of America, publishes papers on all aspects of the fungi, including lichens. Subjects appropriate to the journal are fungal physiology and biochemistry, ecology, pathology, development and morphology, systematics, cell biology and ultrastructure, genetics, molecular biology, evolution, applied aspects, and new techniques. Mycologia has been published as a bimonthly journal continuously since 1909 as a continuation of the Journal of Mycology, which was founded in 1885, and has been the official publication of the Mycological Society of America since the formation of the society in 1932.
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Mycologia
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