Cylindrosporium concentricum Grev.

Light Leaf Spot of Brassicae

“…They make their appearance, singly or in groups, as minute black bodies, resembling sclerotia, each surrounded by light-grey hyphae which radiate from the base of the young apothecium, forming a hoary subiculum. In their cultures both Thomson (1936) and, later still, Cabral (1940) observed black sclerotium-like structures which did not develop further. These they thought might be reproductive bodies of some sort, such as pycnidia.…”

“…The fungus causing Light Leaf Spot was originally described by Greville (1823), who estabhshed it as the type species of a new genus Cylindrosporium, C. concentricum. Later, Berkeley and Broome (1850) transferred the fungus to the genus Gheosporium, but Thomson (1936), reinvestigating the morphology and development of its asexual stage, concluded that it was not a true Gheosporium and proposed the retention of the fungus in the genus Cylindrosporium. His paper includes a detailed discussion of the nomenclature of the f"ungus.…”