Irish lichens
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Order: Umbilicariales
Family: Fuscideaceae
Species: Fuscidea lightfootii Photos: On willow twig. Ballingeary and Glengarriff, SW Ireland. Often infertile, thallus forms small circular patches of bright-green to olive-brown warted and often sorediate granules. Thin apothecia are black or brownish-black, flat or slightly convex with slightly paler margins. Asci 8-spored, the spores simple, 8-11 x 3.5-4.5 µm, medianly constricted. Colourless, sometimes brown when old. Chemical reactions negative, UV+ white or UV- Frequent on smooth-barked twigs, particularly Willow (Salix), in wet woodlands and boggy areas. Similar: Fuscidea pusilla is sterile, the thalli forming small rosettes (usually <10 mm diam.) covered with soralia that become confluent |
Fuscidea lightfootii.