NATS TRUFFLE AND TRUFFLE-LIKE FUNGI .5. TUBER LYONII (EQUALS T-TEXENSE), WITH A KEY TO THE SPINY-SPORED TUBER SPECIES GROUPS

As a result of examination of the type of Tuber lyonii Butters and num erous collections of Tuber texense Heimsch, the latter is synonymized with the former. The species is redescribed to encompass its known phe notypic variation, and its range is extended from earlier reports in T exas, Georgia and Ohio to the presently known range of northeastern Me xico north to New Mexico, then east along the Gulf Coast to Florida an d north to Minnesota, Quebec, New York and Connecticut. The 3-layered wall of the asci of T. lyonii is described, and a key is provided to t he three Tuber spp. that have spores ornamented with spines connected by a low reticulum.