X. allantoidea: stroma

X. allantoidea: stromatal surface

X. grammica: stroma

X. grammica: stromatal surface

X. melanura: stromata

X. melanura: stromatal surface

X. nigripes: stromata

X. nigripes: stromatal surface

X. nigripes: cross section of stroma

X. schweinitzii: stroma

X. schweinitzii: stromatal surface

X. scopiformis: stromata

X. scopiformis: stromatal surface