Order: Lecanorales       Family: Porpidiaceae Species: Porpidia hydrophila Growth type crustose. Photos: On siliceous rock. Co. Cork and Co. Kerry, SW Ireland Smooth, finely cracked pale grey or bluish-grey thallus, often tinged orange or greenish with inconspicuous or dark prothallus. Large scattered black apothecia, convex when mature, occasionally pruinose. Abundant black pycnidia. Asci 8-spored with colouless simple spores, 18-23 x 7-9 µm. Microscope photographs below. Found on siliceous rocks in and beside upland loughs and streams and on flushed moorland rocks. Chemical reactions negative. Epithecium greenish-blue in section. Similar: Porpidia cinereoatra, epithecium brownish-green.

Microscope photographs



Porpidia hydrophila January 2012