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Caloplaca ferruginea
Crustose lichen. The apothecia are characteristically a deep red colour with a flexuose or uneven rim. The thallus is white to grey in colour and may be immersed in the substrate. Usually found on the bark (neutral to basic) of mature trees or on twigs, including hawthorn and oak. When the apothecia are cut in section there is rarely any photobiont present (in the hymenium).
On the bark of a horse chestnut tree, at the Universidad Autónoma de Madrid Campus
Camera Model: NIKON D300. Exposure Time: 1/60 sec. f/36 ISO Speed Rating: 200. Focal Length: 90.0 mm. Flash fired
Spotted on Apr 30, 2012
Submitted on May 31, 2012
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