Lepteutypa cupressi
Lepteutypa cupressi is a plant pathogen which causes a disease in Cupressus, Thuja, and related conifer types.
The name Seiridium cupressi is for the anamorph of this fungus, that is, it is used for the asexual form. Now that it is known to have a sexual stage the genus name Lepteutypa should take precedence.