Porpidiaceae Porpidia soredizodes Growth type crustose Chemical results: Soredia K+ yellow, C-, P+ orange Found on siliceous rocks and pebbles, brick walls and gravestones. Grey or creamy-grey patches of thallus surrounded by a black prothallus. Round or irregular soralia with greyish-white or greyish, farinose or granular soredia. Apothecia rare. The sorediate counterpart of Porpidia crustulata

Porpidia soredizodes
WLG meeting, Warren Shore, North Solent NNR, Hampshire. November 2013