New records of the rare metallophilic lichen Porpidia melinodes from hornfels in the Sudety Mts

Abstract

typical for siliceous rock, including Acarospora fuscata (Nyl.) Th. Fr., Candelariella coralliza (Nyl.) H. Magn., Lecanora intricata (Ach.) Ach., L. polytropa (Ehrh. ex Hoffm.) Rabenh., Lecidea confluens (Weber) Ach., Protoparmelia badia (Hoffm.) Hafellner, Rhizocarpon geographicum (L.) DC., Umbilicaria polyphylla (L.) Baumg. and another metallophilic species, Lecidea silacea (Hoffm.) Ach. (locality at Wysoki Kamien Mt.). Thalli of Porpidia melinodes were recorded on both exposed horizontal surfaces and vertical surfaces in basal parts of rock complexes, as well as on smaller boulders and stones. Porpidia melinodes is characterized by having a rather thin, orange or partially orange-gray thallus with an uneven upper surface and a welldeveloped, dull gray to black prothallus (Fig. 1).