File:Placynthium subradiatum (Nyl.) Arnold 723543.jpg
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[edit]DescriptionPlacynthium subradiatum (Nyl.) Arnold 723543.jpg |
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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current | 19:01, 16 June 2018 | 1,392 × 1,044 (562 KB) | Leoboudv (talk | contribs) | =={{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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Camera manufacturer | PENTAX RICOH IMAGING |
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Camera model | PENTAX WG-3 GPS |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/3.1 |
ISO speed rating | 125 |
Date and time of data generation | 15:11, 12 March 2017 |
Lens focal length | 5.5 mm |
Orientation | Normal |
Software used | Microsoft Windows Photo Viewer 6.2.9200.16384 |
File change date and time | 19:39, 16 March 2017 |
Y and C positioning | Co-sited |
Exif version | 2.3 |
Date and time of digitizing | 15:11, 12 March 2017 |
Meaning of each component |
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APEX exposure bias | 0 |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
Supported Flashpix version | 1 |
Color space | sRGB |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 31 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Macro |
Receiver status | Measurement interoperability |
Direction of image | 320.5 |
GPS tag version | 2.3.0.0 |