. Fungi; their nature and uses. Fungi. THE SPORE AND ITS DISSEMINATION. 131 In the Perisporiacei the periihecinm has no proper orifice, or ostiolum, for the discharge of the mature sporidia, â which are usually small, and are disseminated by the irregular rupture of the somewhat fragile conceptacles. The asci are usually more or less saccate, and the sporidia approximate to a globose form. The asci are often very diffluent. In Perisporium vulgare the ovate brown sporidia are at first, and for some time, attached together in fours in a concatenate or beaded manner. In some species of Erysiphei
. Fungi; their nature and uses. Fungi. THE SPORE AND ITS DISSEMINATION. 131 In the Perisporiacei the periihecinm has no proper orifice, or ostiolum, for the discharge of the mature sporidia, â which are usually small, and are disseminated by the irregular rupture of the somewhat fragile conceptacles. The asci are usually more or less saccate, and the sporidia approximate to a globose form. The asci are often very diffluent. In Perisporium vulgare the ovate brown sporidia are at first, and for some time, attached together in fours in a concatenate or beaded manner. In some species of Erysiphei the conceptacle en- closes but a single sporangium, in others several, which are attached together at the base. In some species the sporangia contain two, in others four, in others eight, and in others numerous sporidia. In Chcetomium the asci are cylindrical, and in most cases the coloured sporidia are lemon-shaped. When the conceptacles are fully matured, it is commonly the case that the asci are absorbed and the sporidia are free in the interior of the conceptacles. Of the fleshy Discomycetes the genus Peziza may be taken as the type. If the structure which prevails in this genus be brought to mind, it will be remembered that the hymenium lines an expanded cup, and that the asci are packed together, side by side, with their apices outwards, and their bases attached to a substratum of cells which form the inner layer of the recep- tacle. The sporidia are usually eight in each ascus, either arranged in single or double rows, or irregularly grouped to- gether. The asci are produced in succes- ââ . = r Flo, 66.âAsci, sporidia, sion ; the later, pressing themselves upwards and paraphyues of As:o- between those previously developed, cause bolus (Boudier>- the rupture of the mature asci at the apex and the ejection of the sporidia with considerable force. When a large Peziza is. Please note that these images are extracted from scanned page images that may have been digitally
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