. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. CHAPTER V.—COMPARATIVE REVIEW.—ASCOMYCETES. 247 described above on page 229, in the case of Pleospora; an intercalary portion of a mycelial filament grows by successive divisions which arise without fixed order in every direction, and the cells thus formed are subsequently differentiated, while branches from adjoining hyphae usually grow up round the new body and thus help to form its wall (see Fig. 118). This is the mode of formation according to Gibelli and Griffini, Eidam
. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. CHAPTER V.—COMPARATIVE REVIEW.—ASCOMYCETES. 247 described above on page 229, in the case of Pleospora; an intercalary portion of a mycelial filament grows by successive divisions which arise without fixed order in every direction, and the cells thus formed are subsequently differentiated, while branches from adjoining hyphae usually grow up round the new body and thus help to form its wall (see Fig. 118). This is the mode of formation according to Gibelli and Griffini, Eidam and Bauke not only in Pleospora herbarum, but also in Cucurbitaria elongata, Leptosphaeria doliolum and two other species not precisely determined, and according. FIG. 118. Pleospora Alternariae, Gibelli. (Determination not certain from the absence of perithecia.) Young stage of development ofpycnidia. a commencement of the swelling and rapid transverse division of the intercalary portion of a hypha, which is developing into a pycnidium and has branches from itself and from an adjacent hypha attached to it. b older stage of the development. The mature structure of these pycnidia closely resembles that represented in Fig. 119, only the wall is formed of several layers. Magn. 600 times. FIG. 119. Cici7inobolus Cesati'i (De Bary, Beitr. Ill), para- sitic on Erysiphe. A ripe pycnidium (seen from without) open above on the leftand discharging its sporesj, having de- veloped in a gonidiophore of the Erysiphe which is attached to the mycelial filament X X and bears four dead gonidia £ on its summit. B a small and nearly ripe pycnidium, formed on a branch of a mycelial hypha m m of the Erysiphe, in which the slender mycelial hyphae of the Cicinnobolus may be seen. The figure shows the upper surface and the optical longitudinal section of the transparent peridium; the section shows the young spores growing inwards from the one- layered wall. C tranverse section through the wall of
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