Hemlock - Blueberry rust
Damage, symptoms and biology
Damage to either host is negligible and localized in areas where hemlock regeneration grows intermingled with huckleberries and blueberries.
Until recently, this rust was considered a part of the genus Pucciniastrum. However, because of the unique structure of its aecia, it has been placed in the genus Naohidemyces. Another needle rust, Melampsora epitea, which is also found on hemlock, could be confused with N. vaccinii. The aecia of M. epitea are "loose," with no peridium covering the aeciospores, while those of N. vaccinii have a dome-shaped covering with a centrally located hole (ostiole) through which spores are released.