Fungi, Ascomycetes, Ustilaginales, Uredinales . 214 PROTOBASIDIOMYCETES [CH. fertile cells of Phragmidium violaceum was shown by Blackman and subse-quently by Welsford to be derived from one of the smaller cells at the baseof the fertile layer. It is thus a vegetative nucleus; it enters the fertile cellby migrating through the wall, becoming much drawn out and laterally com-pressed. It leaves a pore which maybe identified after its passage (fig. 192)..

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922