Abstract
Colletotrichum graminicola (Ces.) G.W. Wils. isolated from Zea mays L. formed two different types of conidia on PDA. One of them is ellipse-shaped conidia, 6-21×3.0-6.0μm (12×3.8μm on average), which are formed at the tips of small side protuberance of young hyphae. These conidia did not change into sickle-shaped ones after the culture was incubated for a long time. Another type is sickle-shaped conidia, 24-30×3.3-5.7μm (27.2×4.7μm on average), produced in sporodochia in old culture. The ellipseshaped conidia were more virulent to the leaves of Zea mays than the sickle-shaped ones. The ellipse-shaped conidia seem to correspond to the “free conidia” described by Barnett in 1960 (Illustrated genera of Imperfect fungi: p. 194).
