Tuber umbilicatum, a new species from China, with a key to the spinose-reticulate spored Tuber species

Abstract

Tuber umbilicatum, a truffle associated with Pinus yunnanensis in southwestern China, is described and illustrated as a new species. It is characterized by inconspicuously papillate ascomata with an umbilicate basal cavity and ellipsoid ascospores ornamented with spines connected by low ridges to form an alveolate reticulum 6-8 meshes across the spore width. A key to seven Tuber species bearing spinose-reticulate spores is presented.