. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. CHAPTER V.—COMPARATIVE REVIEW.—UREDINEAE. 175 been ascertained. The spores are between round and polyhedric, more rarely ellipsoid and rilled with a dense protoplasm, which is sometimes colourless, but is more commonly coloured by a reddish yellow oil; the walls of the spores are colourless or of a brownish colour, and often show the prismatic structure described on page ioo. The hymenium and the rows of spores which proceed from it are enclosed in a membranous envelope compo
. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. CHAPTER V.—COMPARATIVE REVIEW.—UREDINEAE. 175 been ascertained. The spores are between round and polyhedric, more rarely ellipsoid and rilled with a dense protoplasm, which is sometimes colourless, but is more commonly coloured by a reddish yellow oil; the walls of the spores are colourless or of a brownish colour, and often show the prismatic structure described on page ioo. The hymenium and the rows of spores which proceed from it are enclosed in a membranous envelope composed of a single layer of cells (the peridium, pseudo-. \G&> FIG. 124. Pitccimti graminis. A portion of a thin transverse section of a leaf of Berberis vulgaris with a young aecidium beneath the epidermis 11. I section through a spot in a Berberis leaf containing aecidia. At X is seen the normal structure of the leaf, the part u—y't which contains the Fungus, monstrously thickened ; k—0 upper surface of the leaf, sp spermogonia. a aecidia opened by a section through the middle, / their peridium. The specimen marked with / only without an a shows the peridium exposed by the section in a surface-view. // group of ripe teleutospores bursting through the epidermis e from the tissue b of a leaf of Trilicum repens; t teleutosppres. /// teleuto- spores t and uredospores ur. See above, p. 62. From Sachs' Lehrbuch. / slightly magni- fied, // magn. 190, /// 390 times. FIG. 125. Chrysomyxa Rho- dodendri. Basidium from an aeci- dium bearing a chain of spores. Magn. 600 times. For the explan- ation of the figure see page 71. peridium or paraphyses-envelope); the cells of the envelope are in rows like the spores, and it grows pari passu with the chains of spores and by the constant addition of new elements from the base. This growth is effected by a compact annular row of cells, like basidia, which occupy the margin of the hymenium, and it advances therefore exactly in the same
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