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Cover photograph (Copyright © 2009, American Society for Microbiology. All Rights Reserved.): Mature perithecia (sexual fruiting bodies) with protruding ostiolar necks formed by the chestnut blight fungus Cryphonectria parasitica on chestnut tree twigs following mating of two strains of the opposite mating type (top panel). Disruption of the hypovirus-responsive C. parasitica gene encoding the Zn(II)2Cys6 transcription factor PRO1 results in female infertility, i.e., the inability to form perithecia when the mutant strain serves as the female partner of a sexual cross (bottom panel). Photographs were captured at six months after initiation of the mating using a Pentax K100D digital SLR camera equipped with a macro lens. (See related article on page 262.)
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