Abstract
Abstract: Vondrak, J., Palice, Z., Mares, J. & Kocourkova, J. 2013. Two superficially similar lichen crusts, Gregorella humida and Moelleropsis nebulosa, and a description of the new lichenicolous fungus Llimoniella gregorellae. — Herzogia 26: 31–48. Although some characters distinguishing Gregorella humida and Moelleropsis nebulosa were previously known, sterile specimens and specimens with poorly-developed apothecia are often difficult to separate. We provide morphological and anatomical characters that will allow reliable determination of such difficult collections. The most important character for determination of sterile thalli is the shape of the mycobiont cells in the thallus granules. A key summarizes the diagnostic characters of G. humida and M. nebulosa (and some similar species). The Nostoc photobiont in G. humida is morphologically similar to Nostoc from M. nebulosa but the two are not closely related within the genus. The ecology of both lichen species is similar, but there are differences in...
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