. Diseases of economic plants. Plant diseases. APPENDIX 489 tures (Fig. 211). Other spores (conidia) are borne upon the ends of stalks (Fig. 212). These stalks may be uncovered, naked, or they may be inclosed in pycnidia (Fig. 213). Several spore forms may be borne by one and the same fungus. The mode of spore formation, the time and place, are important to. Fig. 212. — Conidia and conidiophore of powdery mil- dew. A pycnidivim. Redrawn after Quartance and Shear. the pathologist, for they may reveal a vulnerable point of attack in the life history of the parasite. Bacteria, physiologically, ar
. Diseases of economic plants. Plant diseases. APPENDIX 489 tures (Fig. 211). Other spores (conidia) are borne upon the ends of stalks (Fig. 212). These stalks may be uncovered, naked, or they may be inclosed in pycnidia (Fig. 213). Several spore forms may be borne by one and the same fungus. The mode of spore formation, the time and place, are important to. Fig. 212. — Conidia and conidiophore of powdery mil- dew. A pycnidivim. Redrawn after Quartance and Shear. the pathologist, for they may reveal a vulnerable point of attack in the life history of the parasite. Bacteria, physiologically, are much like fungi, but their bodies are single-celled and not threadlike (Fig. 214). They are very small, — one of ordinary size is about mm. long (j-^^ inch); yet they multiply with such rapidity (one produces a progeny of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870-. New York, Macmillan
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