. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. Fig. 194. Phragmidium violaceum Went.; caeoma; sterile cell pushing up between epidermal cells of host, x 1300; after Blackman. Fig. 195. Phragmidittm speciosum Fr.; fertile cells after conjugation; aecidio- spore mother-cell above; after Christ- man. takes place and aecidiospore mother-cells are cut off so that a single row of aecidiospores is developed from each pair of gametes. Christman regards the fertile cells as isogametes between which conjugation takes place, and the sterile cells merely as buffers, of which the function is to as
. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. Fig. 194. Phragmidium violaceum Went.; caeoma; sterile cell pushing up between epidermal cells of host, x 1300; after Blackman. Fig. 195. Phragmidittm speciosum Fr.; fertile cells after conjugation; aecidio- spore mother-cell above; after Christ- man. takes place and aecidiospore mother-cells are cut off so that a single row of aecidiospores is developed from each pair of gametes. Christman regards the fertile cells as isogametes between which conjugation takes place, and the sterile cells merely as buffers, of which the function is to assist in the rupture of the epidermis. His observations on Phragmidium, speciosum were confirmed in 1906 by Blackman and Fraser for Melampsora Rostrupi on Mercurialis (fig. 174); these authors pointed out that the fusion of the fertile cells is a reduced fertilization, strictly comparable to that in Ph. violaceum but achieved by the union of female cells in pairs instead of by the entrance of a vegetative nucleus into the female cell. This interpretation is confirmed by the fact. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gwynne-Vaughan, Helen Charlotte Isabella (Fraser) Dame, 1879-. Cambridge [Eng] University Press
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922
