. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. FIG. 81. a and b Entyloma Calendulae. a mycelial filament with two young resting-spores. * resting-spore germinating; the front pair of primary sporidia in the whorl shows conjugation at the base, c and d Entyloma Ungerianum, DeBary. cagerminatingresting-spore; four primary sporidia conjugating by pairs at their apices, d the same specimen seven hours later ; commencement of the abjointing of a secondary sporidium (gonidium) on each pair. Magn. 600 times. FlG. 82. Development
. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. FIG. 81. a and b Entyloma Calendulae. a mycelial filament with two young resting-spores. * resting-spore germinating; the front pair of primary sporidia in the whorl shows conjugation at the base, c and d Entyloma Ungerianum, DeBary. cagerminatingresting-spore; four primary sporidia conjugating by pairs at their apices, d the same specimen seven hours later ; commencement of the abjointing of a secondary sporidium (gonidium) on each pair. Magn. 600 times. FlG. 82. Development of the spores oi Ustilago Tragopogonis; successive stages of the development according to the letters, a sporogenous branch, just appearing on the surface of the young corolla of Trago- pogon pratenszs and beginning to form a tuft of branch- lets, d spore-tuft with several ripe spores, the episporium of which is coloured a dark violet and furnished with reticulate thickenings. Magn. 300 times. gelatinous sheath (Fig. 82 b, c), and forms inside it a relatively small almost homo- geneous and strongly refringent nucleus-like body. The definitive membrane of the spore is then formed on its outer surface inside the gelatinous envelope, and developes with the protoplasm into the comparatively large spore. As growth proceeds the gelatinous sheath becomes more delicate and paler and disappears altogether when the spore has reached maturity {b-d). In the genera Urocystis, Sorosporium, and Tuburcinia the ripe spores are joined together from two up to a considerable number in a cluster and are each provided with a persistent or temporary special envelope. The development of the cluster is not clearly known in all points. In Urocystis, according to Wolff and Winter, the first beginning of a cluster is represented by a turgid and often curved branch from. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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