Rhabdocline, Swiss Needle Cast and Didymascella
Rhabdocline pseudotsugae - on Douglas-fir
Apothecia on needles as they appear when dry.
Apothecia on needles when they are wet. The epidermis lifts up off the apothecia and ascospores are released.
Phaeocryptopus gaeumannii - Swiss Needle Cast on Douglas-fir
Douglas-fir with Swiss needle cast. Perithecia (numerous small black dots) can often be seen even without a hand lens if needles are inspected closely.
Perithecia emerging from stomata on infected needles are easily seen with a hand lens.
Didymascella thujina - on Western Red Cedar
Apothecia on lesions of western red cedar produce asci with 2 ascospores per ascus.