Biology:Bryodina
Bryodina is a genus of two species of crustose lichens in the family Lecanoraceae.[1][2] It was first proposed as a distinct genus by Austrian lichenologist Josef Hafellner in the early 1990s, but the name was validly published only in 2001 when Hafellner supplied a formal Latin [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] and typification. It is distinguished from the morphologically similar genus Bryonora by the clearly separated [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] and [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], and by the thin-walled ascospores.
Taxonomy
Josef Hafellner first informally separated the moss-dwelling "Rhyparizae" species from Bryonora in the early 1990s, coining the name Bryodina, but the genus became nomenclaturally valid only in 2001 when he published a full Latin [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] and typified it with Bryodina rhypariza.[3] The genus sits in the family Lecanoraceae (order Lecanorales) and is typified by Bryodina rhypariza (originally described as Lecanora rhypariza by William Nylander in 1860[4]).[3] A second member is the Himalayan species B. selenospora. Hafellner highlighted several anatomical distinctions from Bryonora in the strict sense: the apothecial margin is grey-brown and resembles that of some Rinodina species, the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] around the apothecium carries coarse [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], and a cup-shaped layer of intricately woven hyphae separates the hymenial tissue from the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. Bryodina spores are thin-walled, kidney- to sausage-shaped and usually curved, whereas those of Bryonora are thicker and more barrel-like. The generic name combines the Greek bryon ('moss')—reflecting its substrate preference—with the ending "-dina", chosen to evoke its superficial resemblance to Rinodina.[3]
Description
The lichen forms a thin, crustose thallus that spreads over siliceous rock or the cushions of moss that colonise such stone. Apothecia are [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]: the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] and margin are differently coloured, the latter retaining a thin rim of thallus tissue (the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]). Discs range from pale to mid-brown and sit flush with, or only slightly above, the surrounding crust. Beneath the hymenium lies a distinctive "intricata" layer—an intricate tangle of hyphae that behaves like a tiny cup, isolating the fertile tissue from the thalline margin. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] itself displays coarse granules that are visible in thin sections.[3]
Asci follow the Lecanora-type blueprint: eight ascospores, a strongly iodine-positive (eu-amyloid) [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], and a broad central mass that also stains blue in iodine. Spores are initially single-celled but may develop one septum with age; they are oblong, gently kidney-shaped or stoutly [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], and have thin, parallel walls—features that help separate the genus from lookalikes. No specialised asexual propagules have been reported in Bryodina, and secondary metabolite data are lacking.[3]
Habitat and distribution
Bryodina species colonise siliceous substrates in cool, rather open situations where mosses form persistent mats. The type species is widespread, though scattered, on nutrient-poor sandstone and granite outcrops in temperate parts of Europe, while B. selenospora occupies comparable habitats on Himalayan boulders. Both appear to rely on the micro-climatic buffering provided by the moss layer, and neither has yet been confirmed from calcareous or heavily shaded sites.[3]
References
- ↑ "Bryodina". Species 2000: Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/3DMB.
- ↑ Hyde, K.D.; Noorabadi, M.T.; Thiyagaraja, V.; He, M.Q.; Johnston, P.R.; Wijesinghe, S.N. et al. (2024). "The 2024 Outline of Fungi and fungus-like taxa". Mycosphere 15 (1): 5146–6239 [5250]. doi:10.5943/mycosphere/15/1/25. https://www.researchgate.net/publication/385939154.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Hafellner, J.; Türk, R. (2001). "Die liechenisierten Pilze Österreichs – eine Checkliste der bisher nachgewiesenen Arten mit Verbreitungsangaben" (in de). Stapfia 76: 150. https://www.researchgate.net/publication/309282880.
- ↑ Nylander, W. (1860). "Novitiae quaedam licheneae Norvegicae" (in la). Öfversigt af Kongl. Vetenskaps-Akademiens Förhandlingar 17: 295–297. https://www.biodiversitylibrary.org/page/15960735.
Wikidata ☰ Q10436776 entry
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