. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. VIII] UREDINALES 215 vegetative nucleus has replaced that of the no longer functional male element. As already shown there is a strong presumption that this male element was the spermatium and the fertile cell may then be regarded as an oogonium and the young aecidium as a group or sorus of female reproductive organs. In this connection Blackman has suggested a possible origin of the sterile cell; in Phragmidium violaceum he found it to be occasionally elongated and pushed up between the cells of the epidermis so that it was covered only
![. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. VIII] UREDINALES 215 vegetative nucleus has replaced that of the no longer functional male element. As already shown there is a strong presumption that this male element was the spermatium and the fertile cell may then be regarded as an oogonium and the young aecidium as a group or sorus of female reproductive organs. In this connection Blackman has suggested a possible origin of the sterile cell; in Phragmidium violaceum he found it to be occasionally elongated and pushed up between the cells of the epidermis so that it was covered only Stock Photo](https://c8.alamy.com/comp/RDX0ER/fungi-ascomycetes-ustilaginales-uredinales-fungi-viii-uredinales-215-vegetative-nucleus-has-replaced-that-of-the-no-longer-functional-male-element-as-already-shown-there-is-a-strong-presumption-that-this-male-element-was-the-spermatium-and-the-fertile-cell-may-then-be-regarded-as-an-oogonium-and-the-young-aecidium-as-a-group-or-sorus-of-female-reproductive-organs-in-this-connection-blackman-has-suggested-a-possible-origin-of-the-sterile-cell-in-phragmidium-violaceum-he-found-it-to-be-occasionally-elongated-and-pushed-up-between-the-cells-of-the-epidermis-so-that-it-was-covered-only-RDX0ER.jpg)
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. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. VIII] UREDINALES 215 vegetative nucleus has replaced that of the no longer functional male element. As already shown there is a strong presumption that this male element was the spermatium and the fertile cell may then be regarded as an oogonium and the young aecidium as a group or sorus of female reproductive organs. In this connection Blackman has suggested a possible origin of the sterile cell; in Phragmidium violaceum he found it to be occasionally elongated and pushed up between the cells of the epidermis so that it was covered only by the cuticle (fig. 194); if in the past it broke through this also, it would have formed an efficient trichogyne and may well have func- tioned as such. In the related species Phragmidium speciosum, Christman, in 190.5, described a similar development of sterile and reproductive cells, but in this case the fertile cells become inclined one towards another in pairs and, at the point of contact, the walls dissolve so that the protoplasts come into relation, at first through a small pore, but later along the greater part of their length. Binucleate cells are thus formed (fig. 195), conjugate division. 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 work.. Gwynne-Vaughan, Helen Charlotte Isabella (Fraser) Dame, 1879-. Cambridge [Eng] University Press