MYCOSPHAERELLA LUPINI SP. NOV., A SERIOUS LEAF-SPOT DISEASE OF PERENNIAL LUPIN IN SOUTH-CENTRAL IDAHO, USA

Mycosphaerella lupini is described as the teleomorph of Thedgonia lupi ni, the organism commonly associated with a leaf spot disease of peren nial lupin in the U.S.A. The latter organism is also shown to be disti nct from Didymella lupini, which is associated with a Phoma anamorph, and occurs predominantly on overwintered lupin stems. Thedgonia lupini , which is known to produce conidia in disarticulating chains, is show n to do so by sympodial as well as percurrent proliferation. The genus Thedgonia is accordingly emended to incorporate both types of prolife ration of the conidiogenous locus. Mycosphaerella lupini is the first teleomorph linked to the anamorph genus Thedgonia.