. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 313 Thecaphora Fingerhuth (p. 302) Sori in various parts of the host, often as indefinite masses in the floral parts or forming rather firm pustules on the stem, at ma- turity with a dusty spore- mass; spore-balls composed of few to many fertile cells, of small to large size; rather permanently united; spores usually yellowish or reddish, smooth on contiguous sides Fiq. 228.—Thecaphora, spore ball germina- but usually marked on the *'°°- ^^'^ ^retold. free surface; germination, so far as known, b
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 313 Thecaphora Fingerhuth (p. 302) Sori in various parts of the host, often as indefinite masses in the floral parts or forming rather firm pustules on the stem, at ma- turity with a dusty spore- mass; spore-balls composed of few to many fertile cells, of small to large size; rather permanently united; spores usually yellowish or reddish, smooth on contiguous sides Fiq. 228.—Thecaphora, spore ball germina- but usually marked on the *'°°- ^^'^ ^retold. free surface; germination, so far as known, by means of a single sporidium at the tip of the elongate septate promycelium. A small genus of slight economic importance. T. deformans Dur. & M.^^e- 129 Sori in the seeds, showing when the legumes are broken open as reddish-brown, dusty spore-masses which destroy most of the seeds; spore-balls reddish-brown, ovoid to spherical, rather firm, composed of 3-25 (usually 7-12) spores, chiefly 27-60 n in length; spores in optical section triangular to polygonal or when free irregular oblong, free surface with papillae that sometimes vary to spiny processes, 15-25 n, chiefly 15-20 m in length. On a large number of Legiuninous hosts, including species of Vicia, Lathyrus, Lupinus, Trifolium, etc., in widely scattered regions of both the old and the new world. Tolyposporiuin Woronin (p. 302) Sori usually in the inflorescence, especially the ovary, forming granular spore-masses at maturity; spore-balls dark-colored, of numerous spores permanently united, germination about as in Ustilago. A genus of about ten species. T. bullatum ^s-1^ Sori in ovaries, infecting occasional ones, ovate, about 3-5 mm. in length, covered with a thin, greenish, smooth membrane, upon rupture of which the black granular spore-mass becomes scattered;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
