Order: Teloschistales       Family: Teloschistaceae Species: Caloplaca ferruginea Growth type crustose. Photos: On hazel and willow. The Burren and Gougane Barra, Ireland Entire or immersed thin, smooth, pale whitish-grey thallus. Large bright-orange apothecia (1-2mm diam.) and often with uneven, flexose margins. The asci 8-spored, the spores ellipsoid, polarilocular, 12-14 x 6-8 µm, septum 5 µm to approx 1/2 length of ascospore. Micrograph below. K+ crimson / purple. Mainly found on Hazel and Willow, also on twigs and trunks of other basic-barked trees. Increasing in Ireland, rare in UK Similar: C. crenularia. Found on siliceous rocks.

Micrograph

Caloplaca ferruginea. April and September 2009