. Bulletin. Natural history; Natural history. 34 ILLINOIS NATURAL HISTORY SURVEY BULLETIN. Fig. 19.—Petri-dish culture of Coniothyriiim B. showing the character- istics of the fungus after 18 days on corn meal agar. Pycnidia are produced only in the dark areas. Compare with Fig. 18. central portion of the growth but finally, as the thallus ages, in all parts. Coniothyi'iitm B has pycnidia which are dark brown, membranous, spherical or nearly so, and with definite, circular ostioles which are darkened or carbonized at the margin. A variation in pycnidial size of 60—272 fjL has been observed. Th
. Bulletin. Natural history; Natural history. 34 ILLINOIS NATURAL HISTORY SURVEY BULLETIN. Fig. 19.—Petri-dish culture of Coniothyriiim B. showing the character- istics of the fungus after 18 days on corn meal agar. Pycnidia are produced only in the dark areas. Compare with Fig. 18. central portion of the growth but finally, as the thallus ages, in all parts. Coniothyi'iitm B has pycnidia which are dark brown, membranous, spherical or nearly so, and with definite, circular ostioles which are darkened or carbonized at the margin. A variation in pycnidial size of 60—272 fjL has been observed. The spores, in masses, vary from dark to light brown but are only dilutely colored when separate and may sometimes appear nearly hyaline. They are one-celled, ovoid-oblong to short elliptic, and measure —— fi but are mostly — — /^. In corn meal agar culture, the mycelium of Coniothyrium B, shown in figure 19, is at first entirely white, quite fine, and very silky in ap- pearance, and the marginal growth is regular. It remains white 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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