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The style sometimes remains in a hardened form, rendering the fruit apiculate; at other times it falls off, leaving only traces of its existence.

The nodding, lenticular, umbilicate sporangium, barely attached to the apiculate stipe, is sufficient to distinguish this elegant little species, recognized and quite aptly characterized by mycologists for more than one hundred years.

The spores are globose and smooth, often apiculate.

The third glume is apiculate, hardened in fruit.

The first glume is small, oblong, obtuse or apiculate.