Chrysomyxa ledi on Picea abies: a. Inner surface of interlocking peridium cells of a primary aecium in SEM; b. Same view of a peridium cell in a line drawing; c. Two primary aeciospores in SEM, note the tapering annulate wall ornaments and the cap-like structures (arrows) formed by the ends of the smooth overlay of the spore wall, compare Fig. 8c; (a, c from Zwetko and Blanz 2018: 278, 276; b from Klebahn 1914: 692).