. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. to Melampsoraceae; but the aecial structure indicates their kinship with Pucciniaceae. In Pucciniastreae (Figure 4, a —d) of the family Melampsoraceae the unicellular teliospores divide longitudinally into two, 46 four, or more cells; they are either subepidermal or intraepidermal. In the genus Cronartium (Figure 4, g) unicellular teliospores are fused into a column emerging above the surface. In the genus Chrysomyxa (Figure 4, f) unicellular teliospores rise in vertical chains, together forming waxy red sori. In Melamp
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. to Melampsoraceae; but the aecial structure indicates their kinship with Pucciniaceae. In Pucciniastreae (Figure 4, a —d) of the family Melampsoraceae the unicellular teliospores divide longitudinally into two, 46 four, or more cells; they are either subepidermal or intraepidermal. In the genus Cronartium (Figure 4, g) unicellular teliospores are fused into a column emerging above the surface. In the genus Chrysomyxa (Figure 4, f) unicellular teliospores rise in vertical chains, together forming waxy red sori. In Melampsora (Figure 4, h) the unicellular teliospores unite, forming small subepidermal or subcuticular crusts. In the genus Coleosporium (Figure 4, e) teliospores are waxy, their cells cylindrical, usually thickened at the apex; before germination each spore divides transversally into four cells, each of which gives rise to a single basidiospore. In this way the "teliospores" of Coleosporium are virtually basidia. In the genus Phakopsora the dark-stained teliospores form chains which remain covered by the epidermis. The other genera of Melampsoraceae are not found in the USSR and will not be dealt FIGURE 4. Teliospores of genera of the family Melampsoraceae: a — Melampsorella; b — Hyalopsora; c — Uredinopsis; d — Thekopsora; e —Coleo- sporium; f - Chrysomyxa; g - Cronartium; h - Melampsora. (After Arthur, 1929.) In the family Pucciniaceae the number of genera and their diversity is even greater. Until relatively recently genera have been differentiated by the number of cells forming complex teliospores. Unicellular teliospores have been referred to the genus Uromyces: 2-celled — to Puccinia; triquetrous, 3-celled teliospores — to the genus Triphragmiiim; teliospores of three or more cells stacked one upon another — to Phragmidivtm; telio- spores gathered in caps on pedicels, either simple or composed of several filaments — to the genus Ravenelia.
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectplants
