CHROMOSOME NUMBERS IN THE HYPOCREALES 1. NUCLEAR DIVISION IN THE ASCUS OF NECTRIA PEZIZA

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Abstract
El‐Ani, Arif S. (Columbia U., New York, N. Y.) Chromosome numbers in the Hypocreales. 1. Nuclear division in the ascus of Nectria peziza. Amer. Jour. Bot. 46(6): 412–417. Illus. 1959.—The 4 nuclear divisions in the ascus of Nectria peziza were studied with the aid of acetoorcein and aceto‐carmine techniques. The ascus was found to arise by crozier formation. Synapsis takes place while the chromosomes are still contracted and elongation of chromosomes continues throughout the pachytene phase. The haploid complement was found to consist of 5 chromosomes, the second of which is the nucleolus‐organizing chromosome. This chromosome number which had never been reported in the Hypocreales was also found in several other species of this group of fungi. Chromosome numbers in the Hypocreales are discussed with regard to the species concept in the imperfect genus Fusarium.

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