. Bulletin. Natural history; Natural history. 216 ILLINOIS NATURAL HISTORY SURVEY BULLETIN Vol. 21, Alt. 6 The pycnidia are black, ostiolate, sep- arate to cespitose, globose to ovoid, 650- 860 (n in diameter and 400-600 /i high. They arise fundamenta]l\- in the phellogen- phelioderm region of the bark. The over- l\ing phelleni and epidermis are broken when the pycnidia mature and become erumpent, and there is ver\' little crushing or disintegration of the underlying tissues. The broken host tissues form oval to cir-. Fig. 30.—Portion ot" a Sphaeropsis canker on red oak. The reddish-brown
. Bulletin. Natural history; Natural history. 216 ILLINOIS NATURAL HISTORY SURVEY BULLETIN Vol. 21, Alt. 6 The pycnidia are black, ostiolate, sep- arate to cespitose, globose to ovoid, 650- 860 (n in diameter and 400-600 /i high. They arise fundamenta]l\- in the phellogen- phelioderm region of the bark. The over- l\ing phelleni and epidermis are broken when the pycnidia mature and become erumpent, and there is ver\' little crushing or disintegration of the underlying tissues. The broken host tissues form oval to cir-. Fig. 30.—Portion ot" a Sphaeropsis canker on red oak. The reddish-brown, smooth, shrunken cankerous tissue contains numerous black, globose to ovoid, erumpent pycnidia. X 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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