Susceptibility of Intermountain Douglas-Fir to Rhabdocline Needle Cast When Grown in the Pacific Northwest

Fig. 2. Rhabdocline pseudotsugae subsp. pseudotsugae apothecia on the underside of Douglas-fir needles.



Image from Plant Health Progress article:
Susceptibility of Intermountain Douglas-Fir to Rhabdocline Needle Cast When Grown in the Pacific Northwest