FIGURES 215–237 in Taxonomy and ecology of Achnanthidium (Bacillariophyta, Achnanthidiaceae) from southeastern Brazil with the description of six new species

FIGURES 215–237. LM and SEM images of Achnanthidium saprophilum from Rio Grande reservoir, São Paulo state (SP427898). 215–222. LM views of raphe valves. 223–231. LM views of rapheless valves. 232–234. SEM external view of raphe valves showing striation pattern, axial and central areas. 235. SEM internal view of the raphe valve. 236. SEM external view of the rapheless valve showing striation pattern, axial and central areas. 237. SEM internal view of the rapheless valve. LM scale bar = 10 μm. SEM scale bars indicated in each figure.