A new species of Coelomycete, leptomelanconium abietis, is described and il
lustrated from chlorotic and necrotic needles of Abies balsamea. This fungu
s is typical of the genus in morphology and ecology, but clearly different
from other known species in Leptomelanconium by host, distinct size of coni
diomata, and shape and size of conidia. Its taxonomic placement and relatio
n to other species in this genus and the genus Gloeocoryneum are given.