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Verrucaria nigrescens
Black Pit Lichen
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Photographer: Dr. Amadej Trnkoczy
ID: 0000 0000 0521 0165 (2021-05-06)Copyright © 2021 Dr. Amadej Trnkoczy
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo Apr 22, 2021
latitude 46.35910 longitude 13.70411
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location
Lower Trenta valley, right bank of river Soča; between villages Soča and Trenta; right bank of river Soča, above the main road and the river near Matevž farmhouse, Trenta 1, East Julian Alps (Posočje, Slovenia)notes Syn.: Zschackea nigrescens (Pers.) M. Choisy & Werner, Verrucaria umbrina var. nigrescens (Pers.) Ach., Verrucaria rupestris var. nigrescens (Pers.) Branth & Rostr., Tichothecium nigrescens (Pers.) Flot., Lithoicea tectorum A. Massal.. - Habitat: Light mountain Fagus sylvatica forest, slightly inclined mountain slope, southeast aspect, calcareous, colluvial ground, in half shade, partly protected from direct rain; average precipitations ~ 3.000 mm/year, average temperature 7-9 deg C, elevations 560 m (1.850 feet), alpine phytogeographical region. Substratum: Bare calcareous rock. Comment: Verrucaria nigrescens is a very common, circumglobal lichen growing mostly on calcareous rocks. It is common in the Trenta valley too. Its thallus is superficial, not immersed into the rock (endolithic) as with many other Verrucaria species and relatively thick (0.3 - 0.5 mm). From far it looks like a black tar stain frequent on coastal rocks. From close one can see that the thallus is cracked into fine, irregular areoles, which are smaller than 1 mm. In the cracks among them black prothallus can be seen. Some of the areoles show the upper most part of immersed perithecia. When the thallus is wet it looks quite differently. The cracks in the thallus disappear and the perithecia tips look differently than in the dry state. Ref.: (1) F.S. Dobson, Lichens, The Richmonds Publishing Ca.LTD (2005), p 456. (2) C.W.Smith, et all, The lichens of Great Britain and Ireland,The British Lichen Society,(2009), p 953. (3) V. Wirth, Die Flechten Baden-Württembergs, Teil.2., Ulmer (1995), p 967.camera Nikon D700 / Nikkor Micro 105mm/f2.8
contributor's ID # Bot_1360/2021-DSC06774 photo category: Fungi - lichen
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MORE INFORMATION ABOUT THIS FUNGUS
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| common names
Black Pit Lichen (photographer)
View all photos in CalPhotos of Verrucaria nigrescens Check Google Images for Verrucaria nigrescens |
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The photographer's identification Verrucaria nigrescens has not been reviewed. Click here to review or comment on the identification. |
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Using this photo The thumbnail photo (128x192 pixels) on this page may be freely used for personal or academic purposes without prior permission under the Fair Use provisions of US copyright law as long as the photo is clearly credited with © 2021 Dr. Amadej Trnkoczy.
For other uses, or if you have questions, contact Dr. Amadej Trnkoczy amadej.trnkoczy[AT]siol.net. (Replace the [AT] with the @ symbol before sending an email.) |
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