Morphological update on Calycina marina (Pezizellaceae, Helotiales, Leotiomycetes), a new combination for Laetinaevia marina

Hans-Otto Baral 1  and Teppo Rämä
  • 1 Blaihofstraße 42, 72074 Tübingen, Germany
  • 2 Norwegian College of Fishery Science, UiT - The Arctic University of Norway, Postbox 6050 Langnes, Tromsø, NO-9037, Norway
Hans-Otto Baral
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  • Hans-Otto Baral studied Biology at the University of Tübingen, Germany. Since the 1970s he has been working on the taxonomy, pleomorphy, phylogeny, and ecology of ascomycetes, particularly inoperculate discomycetes. Over 25 years ago, he started to work on a world-wide monograph of Orbiliomycetes which is presently being finished. During the past 30 years, he has published studies in various genera of Helotiales, including the cause of the ash dieback disease. His main concern is the study of living fungal cells, called “vital taxonomy”, which he found to supply a much more reliable basis for morphology-based fungal taxonomy, and a better understanding of the function of fungal microstructures.
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and Teppo Rämä
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  • Teppo Rämä is mycologist and postdoctoral fellow in Marine Biodiscovery. His work with fungi started in Finland in the 2000s, and in 2014 he received his PhD at the University of Tromsø – The Arctic University of Norway. He is interested in the diversity and biology of fungi, and especially the species that are found in the marine environment. His current research focuses on marine fungal biodiscovery and biosystematics.
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Abstract

Laetinaevia marina is a frequent ascomycetous fungus that is widely distributed on the seashores of Scandinavia and Great Britain. It grows on fronds of Fucales (Phaeophyceae) that are washed ashore and lie decaying at the high tide mark or further up on the beach. It is one of the few described marine discomycetes. In the current generic concept it is regarded as a member of Naevioideae (Dermateaceae or Mollisiaceae), while it has previously been placed in the genus Orbilia (Orbiliaceae). We studied fresh collections, in live and dead state, to provide a morphological update on the species and to elucidate its systematic placement using molecular systematics. The hemiamyloid reaction of the apical ring, the absence of croziers, and the faintly refractive vacuolar bodies of the terminal cells of living paraphyses are reported here for the first time. A thin gel sheath surrounding the ascospores was confirmed to exist. Based on morphological characters, ribosomal RNA and protein coding gene sequences published for this species here for the first time, we show that L. marina is distinct from the genera and families it was previously placed in, and propose the new combination Calycina marina, despite its erumpent, sessile, pulvinate and rather immarginate apothecia. Furthermore, we present additional observations on the ecology, phenology, and distribution of the species.

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Botanica Marina publishes high-quality contributions from all of the disciplines of marine botany at all levels of biological organisation from subcellular to ecosystem: chemistry and applications, genomics, physiology and ecology, phylogeny and biogeography. Research involving global or interdisciplinary interest is especially welcome as well as applied science papers dealing with emerging conceptual issues or developing technologies.

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