Chaenotheca nitidula is described as a new species from northeastern North America. It is characterized by long, shining stalks; rather small, spheric, non-pruinose capitul; immersed thallus; and its association with Stichococcus as photobiont. In a phylogenetic analysis based on rDNA ITS1–5.8S-ITS2 sequences, C. nitidula was most closely related to Chaenotheca gracilenta and C. gracillima. It occurs on wood of conifers in old woodlands and has so far been recorded from Maine and New Brunswick.
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Vol. 105 • No. 3