. Bulletin. Natural history; Natural history. HARRIS: INITIAL STUDIES OF ELM DISEASES 57. Fig. 33.—Petri-dish culture of Xylaria. showing the mycelium ami stro- matal branches after two and one-half months on acidified potato dextrose agar. The positive phototropic reaction of the stromata during growth is evident. Abrupt bending- of tbe stalks with their tendency to elongate hori- zontally, shown in figure 33, is evidence of this reaction. This culture was ke])t at the far side of a room rather dimly lighted by windows on one side, first in one position and then in the opposite with refer- en
. Bulletin. Natural history; Natural history. HARRIS: INITIAL STUDIES OF ELM DISEASES 57. Fig. 33.—Petri-dish culture of Xylaria. showing the mycelium ami stro- matal branches after two and one-half months on acidified potato dextrose agar. The positive phototropic reaction of the stromata during growth is evident. Abrupt bending- of tbe stalks with their tendency to elongate hori- zontally, shown in figure 33, is evidence of this reaction. This culture was ke])t at the far side of a room rather dimly lighted by windows on one side, first in one position and then in the opposite with refer- ence to the source of light, and the striking changes in direction of growth shown in the picture resulted from shifting the position of the culture. Small ovoid, hyaline, single-celled conidia are borne along the white upper portion of the stromata about ten days after they aj^pear. In our cultures the stromata were generally unbranched. but a few became forked near the tips. Perithecia have not developed, though swellings in the stromata have begtm to form. Other Fungi Other fungi which have been isolated from diseased elms are HcliiiiiitJiosporiuui, Rhahdnspora and Epicoccum. The first has been. 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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