Punctelia caseana
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Punctelia caseana is a species of foliose lichen in the family Parmeliaceae. Its range covers eastern North America, extending south to central and northern Mexico, where it grows on the bark of many
Punctelia caseana Flickr pellaea
Punctelia rudecta
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Punctelia rudecta, commonly known as the rough speckled shield or the speckleback lichen, is a North American species of foliose lichen in the family Parmeliaceae. This species can be readily identifi
Punctelia caseana
…in the medulla they are K−, KC+ (red), C+ (red), P−, and UV−. Punctelia caseana can be readily distinguished from the common North American species Punctelia rudecta because the latter has isidia rather than soredia. Two lookalikes, Punctelia perrituculata and P. subrudecta, both produce medullary gyrophoric acid…
Rough Speckled Shield Lichen
Herbarium specimen showing pseudocyphellae on a lobe and brown coloration of the lobe tip.
Punctelia rudecta growing on oak in Big Run State Park, Maryland
Punctelia missouriensis Flickr pellaea