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Diagnosis: Large, thick-walled spherical shell, with small (about 2 times bar width) subpolygonal (often trigonal) to subcircular pores, often partially framed, wide bars. Very small, oval to irregular mouth, with thick rim, usually with one main-spine, sometimes with low elevations. Short, thick, main-spines, lacking in some specimens. Numerous short (1-2 times pore diameter) by-spines.

Diameter: 0.6-1.25 mm.

Castanea globosa