1. Plants large, robust, often tinged red, 4.5-6 mm wide; triangular-ovate to ovate-oblong, 18.-2.3 mm long, often undulate … S. anomala
1. Plants small to medium sized, yellowish brown to brown, to 2.5 mm wide; leaves orbicular to oblong, smooth not undulate … 2.
2. Leaves orbicular, 0.9-1.2 mm long, 0.9-1.3 mm wide … S. setulosa
2. Leaves oblong (elliptic?), 0.5-1.5 mm long, 0.2-1.0 mm wide …. S. concreta
1. Plantas grandes, robustas, a menudo con matices rojos, 4.5-6 mm de ancho; ovado-triangulares a ovado-oblongas, 18.-2.3 mm de largo, a menudo onduladas … S. anomala
1. Plantas pequeñas a medianas, pardo-amarillentas a pardas, hasta 2.5 mm de ancho; hojas orbiculares a oblongas, lisas no onduladas … 2.
2. Hojas orbiculares, 0.9-1.2 mm de largo, 0.9-1.3 mm de ancho … S. setulosa
2. Hojas oblongas (elípticas?), 0.5-1.5 mm de largo, 0.2-1.0 mm de ancho …. S. concreta