. Fungi; their nature and uses. Fungi. 178 FUNGI. threads of Tilletia* and similar acts of conjugation, as observed in some species of Ustilago. Whether this interpretation should be placed on those phenomena in the present condition of our knowledge is perhaps an open question. Finally, the spermogonia must be regarded as in some occult manner, which as yet has baffled detection, influencing the per- fection of sporidiaf In Mhy- tisrna, found on the leaves of maple and willow, black pitchy spots at first appear, which contain within them a golden pulp, in which very slender corpuscles are mix
. Fungi; their nature and uses. Fungi. 178 FUNGI. threads of Tilletia* and similar acts of conjugation, as observed in some species of Ustilago. Whether this interpretation should be placed on those phenomena in the present condition of our knowledge is perhaps an open question. Finally, the spermogonia must be regarded as in some occult manner, which as yet has baffled detection, influencing the per- fection of sporidiaf In Mhy- tisrna, found on the leaves of maple and willow, black pitchy spots at first appear, which contain within them a golden pulp, in which very slender corpuscles are mixed with an abundant mucilage. These corpuscles are the spermatia^ which in Rhytisma acerinum are linear and short, in Ehy tisma salicinwm globose. When the spermatia are expelled, the stroma thickens for the pro* duction of asci and sporidia, els?' im-TiUetia caHa ^ "**&*»* which are afterwards developed during the autumn and winter. Several of the species of Hysterium also possess spermogonia, notably H. Fraxini, which may be distinguished from the asci- gerous perithecia with which they are associated by their smaller size and flask-like shape. Prom these the spermatia are expelled long before the maturity of the spores. In Hypoderma virguU" torum, H. commune, and H. seirpinum, the spermogonia are small depressed black capsules, which contain an abundance of minute spermatia. These were formerly regarded as distinct species, under the name of Leptostroma. In Stictis ocellata a great number of thti tubercles do not pass into the perfect state * Berkeley, in "Jour'n. Hort. ; vol. ii. p. 107; Tulasne, "Ann. d. Sc. ; (4rae s6r.), vol. ii. tab. 12. + Tulasne, "New Researches on the Reproductive Apparatus of Fungi;" " Comptes Rendus," vol. xxxv. (1852), p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these
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