SPOTS on on the upper leaf surface, at first dark green, later yellow brown to dark brown with a grey-brown centrum, vein-limited, up to 5 mm diam.
PYCNIDIA (p) formed on the upper leaf side, scattered, immersed slightly erumpent, subepidermal, unilocular, globose to subglobose, 47-140 µm diam, greyish, with a subcircular ostiolum, up to 40 µm diam.
Wall (w) up to 2-3 µm thick, plectenchymatous, composed of thick-walled, yellow brown to dark brown, angular cells.Conidiogenous cells (cc) phialidic, hyaline, sessile on the inner wall surface of pycnidia.
CONIDIA (c) filiform, straight or curved, hyaline, with sharpened tops, euseptate, 27-60 x 1-3 µm.
PLANT HOST AND DISTRIBUTION. Septoria galeopsidis affects different plant species of the genus Galeopsis. The specimens presented here were associated with G. tetrahit L.
According to Teterewnikowa-Babajan (1987), S. galeopsidis was found in Asia, Europe, and North America, including Canada.
Teterewnikowa-Babajan D. N. 1987. Griby roda Septoria w SSSR. Izdatelstwo An Armianskoj SSR, 480 pp.