Gyalecta titovii sp. nova is described from Abkhazia and Russia from the Black Sea coast in the Caucasus region. It is morphologically and anatomically similar to G. flotowii and G. truncigena. It mainly differs from G. flotowii in having ellipsoid and more muriform ascospores (6–12 cells visible in optical view). Gyalecta truncigena has similar ascospores, but the apothecia of G. truncigena are larger (0.3–0.7 mm diam.) and their margins are dark.
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Vol. 48 • No. 6