Far, far down I saw a small brown blotch
near the bottom of the canon.
Symptoms of brown blotch disease are sunken, dark, and brown spots on the mushroom fruit body surface (Olivier and others 1978).
Mushrooms washed by this process were free of adhering soil, less subject to brown blotch than conventionally washed mushrooms, and at least as resistant to enzymatic browning as unwashed mushrooms during storage at 4[degrees]C.
Keep on the lookout for blossom-end rot a soft, dark brown blotch
on the bottom of a tomato.
Distinct darker brown blotch
on inner surface of opercle showing through bone.
Last is the leaf-mining moth, whose caterpillars cause brown blotch
mines on horse chestnuts as well as several acers or maples including sycamores and Norway maples.
There are several varieties, including Lilac Wonder (pale, purple flowers with a brown blotch
at the base of each) Purple King (deep purple with a striped and spotted white and brown centre) and a white-flowered one, White Splendour.