Fungi, Ascomycetes, Ustilaginales, Uredinales . Fig. 90. a. Helvetia crispa (Scop.) Fr.; />? and c. Morchella vulgaris Pers.; after Boudier. nuclear divisions, and finds two chromosomes in the vegetative and four inthe fertile hyphae. Four again appear in the first and second (meiotic)divisions in the ascus, after the second fusion has taken place, and two arerecorded in the telophase of the third division, and in the mitosis in thespore. The ripe spore normally contains eight nuclei. In both species, after an ascus has arisen from the penultimate cell ofa hvpha, the terminal cell may grow
Fungi, Ascomycetes, Ustilaginales, Uredinales . Fig. 90. a. Helvetia crispa (Scop.) Fr.; />? and c. Morchella vulgaris Pers.; after Boudier. nuclear divisions, and finds two chromosomes in the vegetative and four inthe fertile hyphae. Four again appear in the first and second (meiotic)divisions in the ascus, after the second fusion has taken place, and two arerecorded in the telophase of the third division, and in the mitosis in thespore. The ripe spore normally contains eight nuclei. In both species, after an ascus has arisen from the penultimate cell ofa hvpha, the terminal cell may grow on, giving rise to others, and may fusebefore doing so with the third cell of the hypha, which is the stalk-cell ofthe previously formed ascus. In Morchella esculenta the nuclear divisions of the ascus have beenstudied by Maire. After observing eight chromatin bodies in the prophaseof the first division in the ascus, he found four in the prophase and anaphaseof the third, and in the divisions of the spore nuclei; this corresponds closelywith
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922
