. Botanisk tidsskrift. Plants; Plants -- Denmark. Woltke (Urospora p. 69) distinctly points out that the zoospores of this species are produced by successive divisions, while the zoospores of Urospora mirabilis Schmitz (cfr. my footnote p. 361) are produced by simultaneous divisions. I have in my material of U. mirabilis never seen the mother-cells of the zoospores in stages of divisions, which distinctly show successive divisions, and I have also never seen the parietal proto- plasm divided into numerous six-sided portions as in Urospora Worm- skioldii (Rosenv. Grl. Havalg. p. 920) and U. inc
. Botanisk tidsskrift. Plants; Plants -- Denmark. Woltke (Urospora p. 69) distinctly points out that the zoospores of this species are produced by successive divisions, while the zoospores of Urospora mirabilis Schmitz (cfr. my footnote p. 361) are produced by simultaneous divisions. I have in my material of U. mirabilis never seen the mother-cells of the zoospores in stages of divisions, which distinctly show successive divisions, and I have also never seen the parietal proto- plasm divided into numerous six-sided portions as in Urospora Worm- skioldii (Rosenv. Grl. Havalg. p. 920) and U. incrassata (Kjellman Blasto- physa och Urospora p. 13, fig. 11).. Fig. 11. Urospora Hartzii Rosenv. a the basal portion of a filament showing the rhizoids, b the upper part of the rhizoid-bearing portion, c fragment of the filament a little above the rhizoid- bearing portion; d from the upper part and e from the uppermost part of the filaments, showing sporangia; b, c, d, e fragments of the same filament. (l!26: 1.) Urospora Hiirtzii Rosenv. Grl. Havalg. p. 922, fig. 38. The specimens which I have referred to this species are up to 4 cm. long, 29—60^ thick below and 87 — 120// thick above. The relation between the length and the breadth of the cells varies from V2 to 1V2. The cells of the lower part of the filaments, above the rhizoids are usually short, but filaments with elongated cells above the uppermost rhizoid-bearing cell, as in Urospora Wormskioldii, also occur. The upper part of the filaments of my specimens is usually fructiferous and contains longer cells. As far as I can see in my material the young filaments seem to be divided over the whole, but as the upper part of the filaments becomes fructiferous the vegetative divisions are localized rn the lower part. Both. 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 th
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