File:Placynthium subradiatum (Nyl.) Arnold 723544.jpg
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Placynthium subradiatum (Nyl.) Arnold Image location: Planalto das Cezaredas, Portugal It took me more or less two and a half years to “rediscover” these specimens (observatiion 177032), after some failed past attempts. This is a very distinctive and uncommon species of Placynthium, growing on calcareous rock. The common species here in this genus is P. nigrum, that I also found this day at the same habitat (see observation 272274). The grow form of P. subradiatum, which I think to be the species under consideration, fits quite well in these specimens judging by the photos available at the internet, namely the following: http://lichenportal.org/... http://www.irishlichens.ie/pages-lichen/l-235.html http://dryades.univ.trieste.it/... http://www.waysofenlichenment.net/... It can be characterized as follows (excert from Irish lichens): “Blackish or dark olive-brown thallus forming more or less complete rosettes, narrow rings or arcs, dying from the centre. Margin with tightly packed, adpressed lobes, prothallus inconspicuous” . It is said to be rarely fertile and so I was lucky to saw a big amount of apothecia, which are really tiny. I have already looked to the collected sample, which to the naked eye seems like dust, and my next problem will be to select some apothecia from it, since I can’t see any differentiation between apohecia and the other pieces of the thallus that came as a result of scratching the thallus with a knife. A description of P. subradiatum can be found at http://lichenportal.org/portal/taxa/index.php?taxon=56010. Recognized by sight
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:59, 16 June 2018 | | 887 × 1,182 (443 KB) | Leoboudv | =={{int:filedesc}}== {{Information |Description='''''Placynthium subradiatum''''' (Nyl.) Arnold Image location: Planalto das Cezaredas, Portugal It took me more or less two and a half years to “rediscover” these specimens (''observatiion 177032''), after some failed past attempts. This is a very distinctive and uncommon species of [http://mushroomobserver.org/observer/lookup_name/Placynthium ''Placynthium''], growing on calcareous rock. The common species here in this genus is... |
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_Arnold_723544.jpg){kind=link}