. Bulletin. Natural history; Natural history. 109 several other genera: Botrytis (Beauverie and Guilliermond, 13); Alter- naria, Hpicoccum, and Botrytis (Linder, 78); Inzengaea (Borzi, 23); De- matium. Botrytis, Oidium (Klocker and Schiorming, 75); Chaetomium (Zopf, 129, figs. 24, 25, A, B, Tab. 16). The phenomenon, as described, is always associated with senescence. Sclerotia are described by Bakke (6) and by Noack (87), who seem to ha\'e foimd them common on old straw- cultures, varying in length from 200 to 600 1 have not found them at all on straw, though on old rice-cultures they are
. Bulletin. Natural history; Natural history. 109 several other genera: Botrytis (Beauverie and Guilliermond, 13); Alter- naria, Hpicoccum, and Botrytis (Linder, 78); Inzengaea (Borzi, 23); De- matium. Botrytis, Oidium (Klocker and Schiorming, 75); Chaetomium (Zopf, 129, figs. 24, 25, A, B, Tab. 16). The phenomenon, as described, is always associated with senescence. Sclerotia are described by Bakke (6) and by Noack (87), who seem to ha\'e foimd them common on old straw- cultures, varying in length from 200 to 600 1 have not found them at all on straw, though on old rice-cultures they are abundant. Pycnidia and pycnoconidia, as seen by Ravn (91) in//.//'/â « and as described by Bakke (6), I have not seen. CONIDIOPHORES On standard wheat-shoots.âThe conidiophores are in no sense clustered but arise singly as lateral branches, each from an ordinary mycelial cell, and differ from the mycelium chiefly in that they grow erect and straight instead of declined and crooked, and are darker in color than the mycelium. Usually this branch in its basal region is mycelium-like, but it rapidly thickens and darkens to true conidiophore character, and is usually to 5 /.I in length. Sometimes the mycelial cell from which the conidiophore arises also darkens. The conidiophore-cells contain protoplasm, and the protoplast plasmolizes under the usual reagents. When mature the conid-. FlG. 8. â H. No. 1. showing variation in conidiophores. geniculation, conidia-scars, and 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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