. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. CHAPTER V.—COMPARATIVE REVIEW.—UREDINEAE. ^75 been ascertained. The spores are between round and polyhedric, more rarely ellipsoid and filled 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 too. The hymenium and the rows of spores which proceed from it are enclosed in a membranous envelo
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. CHAPTER V.—COMPARATIVE REVIEW.—UREDINEAE. ^75 been ascertained. The spores are between round and polyhedric, more rarely ellipsoid and filled 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 too. 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-. Tie. 124. Puccinin graminis. A portion of a thin transverse section of a leaf of Hgrberis •vulgaris with a young aecidium beneath the epidermis u, I section throu^rh a spot in a Rerberis leaf containing; aecidia. At^is seen the normal structure of the leaf, the part rt—y, which contains the Fungus, monstrously thickened ; h—0, upper surface of the leaf, sp spermogonia. a aecidia opened by a section through the middle, / their peridium. The specimen marked with p 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 ft of a leaf of Triticxim repetis; t teleutospores. /// teIei*o- spores t and uredospores ur. See above, p. 62. From Sachs' Lehrbuch. / slightly magni- fied, // magn. 190, /// 390 times. Fig, 125. Ckryspmyxa RhO' dodaidri. 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 sam
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