A text-book of mycology and plant pathology . Pig. 68.—Portion of a teliosorus of cedar apple in February showing myceliastroma and the binucleate condition of the cells of young teliospores. (After Reed,H. S., and Crabill, C. H., Techn. Bull, g, Va. Agric. Exper. May. 1915) teleutospore basidiospores uredospore. uredospore secidiospore^ intercalary cell^ „ . „•^ msion-cell spermatium} gamete ? gametes Fig. 69.—Diagram of the alternation of generations of a typical rust. (After Grove,W. B., The British Rust Fungi, 1913, 27.) RUST FUNGI 19s been known to germinate, and the large size of
A text-book of mycology and plant pathology . Pig. 68.—Portion of a teliosorus of cedar apple in February showing myceliastroma and the binucleate condition of the cells of young teliospores. (After Reed,H. S., and Crabill, C. H., Techn. Bull, g, Va. Agric. Exper. May. 1915) teleutospore basidiospores uredospore. uredospore secidiospore^ intercalary cell^ „ . „•^ msion-cell spermatium} gamete ? gametes Fig. 69.—Diagram of the alternation of generations of a typical rust. (After Grove,W. B., The British Rust Fungi, 1913, 27.) RUST FUNGI 19s been known to germinate, and the large size of their nuclei suggests thatwe are dealing with male cells. The mature leliospore, which may he looked upon as a sporemother cell, has a single fusion nucleus. The fusion nucleus is large,round and (when unstained) perfectly clear and homogeneous, but forits nucleolus, so that it looks like a vacuole; it occupies almost invari-ably the middle of a cell. The dense chromatin mass is loosened outinto a kind of spireme which becomes shorter and thicker; the nuclearmembrane then disappears, and the spireme thread splits longitudi-nally, though the splitting is often indistinct. It then divides trans-versely into segments which become arranged, or strung out, on aspindle (sometimes, but more rarely, in an equato
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Keywords: ., bookcentury1900, bookdecade1910, bookidtextbook, booksubjectfungi
