Septal Ultrastructure in Three Species of Tuber (Hypogeous Pezizales)

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Abstract
Ultrastructural studies of septa in ascogenous hyphae, asci, and vegetative cells were conducted on three species of Tuber and compared with results obtained from several epigeous Pezizales. Septal pore organelles in the asci and ascogenous hyphae of Tuber californicum and Tuber maculatum were similar to those in taxa of Otideaceae, while those of Tuber n.sp. J&T 6003 were like those of Helvellaceae, Morchellaceae, and Sarcosomataceae. The types of Woronin bodies associated with septa of vegetative cells were also similar to those of some Helvellaceae and Morchellaceae. These data indicate that Tuber may be a biological rather than a phylogenetic taxon.

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