Fungi, Ascomycetes, Ustilaginales, Uredinales . Fig. 142. Amorphomyces Fala-griac Thaxter; paired spores;after Fig. 143. Amorphomyces FalagriacThaxter; male andfemale individuals; , b. mature; afterIll,i . r. Walls cut off the upper and the lower nucleus, and acentral binucleate cell is left, the lower nucleus of whichis presumably a daughter of the oogonial and the upperof the trichophoric nucleus. These divide simultaneouslyand a binucleate inferior sterile cell is separated from thebinucleate fertile cell. This in turn divides to form theascogenic cells, from which the asci
Fungi, Ascomycetes, Ustilaginales, Uredinales . Fig. 142. Amorphomyces Fala-griac Thaxter; paired spores;after Fig. 143. Amorphomyces FalagriacThaxter; male andfemale individuals; , b. mature; afterIll,i . r. Walls cut off the upper and the lower nucleus, and acentral binucleate cell is left, the lower nucleus of whichis presumably a daughter of the oogonial and the upperof the trichophoric nucleus. These divide simultaneouslyand a binucleate inferior sterile cell is separated from thebinucleate fertile cell. This in turn divides to form theascogenic cells, from which the asci are to develop, andthese and the asci which they produce are thereforebinucleate. The two nuclei in the ascus fuse and theirunion is regarded by Faull as the only nuclear fusionwhich occurs in this very curious life history. Meiosisthen takes place, followed by the third division. Theupper daughter nuclei of this division degenerate andaround the lower nuclei spores are organized. In eachspore the nucleus divides once and a transverse septumis formed. Faull describes four chromosomes (fig. 145 c)at ever)- sta^e bu
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922
