Parmotrema perlatum Powdered Ruffle Lichen

A very common, epiphytic lichen, often on trees or shrubs with acidic bark and also on acidic, siliceous rocks and boulders. It is found throughout West Glamorgan, commonly on oaks, willows and hawthorn. The dark underside to the thallus and the occurence of black, eyelash-like cilia, which are often visble along the edges of the thallus lobes, are prominent characters. Clusters of powdery soralia are frequently found along the upturned edges of the thallus lobes. It is sensitive to sulphur dioxide pollution and has undergone a significant increase in its abundance and distribution in many parts of the country with the advent of cleaner air.

Invertebrates associated with parmelioid lichens include several species of moth from the family Erebidae (see photo), such as Common Footman Eilema lurideola and Red-necked Footman Atolmis rubricollis (Local). 

Listed under Parmelia perlata by Alan Orange in Flora of Glamorgan (Wade et al, 1994).