Punctelia rudecta

Punctelia rudecta (Ach) Krog is a common blue-green foliose lichen found on hardwood trees and bark in eastern North America (Fig 1, 2). This species is easily identified by the light underside of the thallus, the relatively large lobes at the edges of the colony, and the small white pores present on the top of the thallus that are distinctive of the genus (Fig. 3, 4). Like many lichens, P. rudecta can be used as an indicator species for pollution levels in an environment. This species has been described as pollution-tolerant, but has also been shown to be a reasonable indicator species of vehicle pollution levels (https://www.amnh.org/learn-teach/young-naturalist-awards/winning-essays2/2007-winning-essays/lichens-as-indicators-of-vehicle-pollution).

Phylum: Ascomycota

Class: Lecanoromycetes

Order: Lecanorales

Family: Parmeliaceae

Genus: Punctelia

Species: rudecta

figure 1

Figure 1: P. rudecta on a hardwood stick in a pine forest

figure 2

Figure 2: P. rudecta thallus, where the distinct blue-green color is apparent.

Figure 3

Figure 3: Folious lobes of P. rudecta

Figure 4

Figure 4: P. rudecta thallus where the white “punctures” (pores) that are indicative of the genus are seen

 

References:

https://www.discoverlife.org/mp/20q?guide=Lichens_USGA

https://plants.usda.gov/core/profile?symbol=PURU2

https://www.amnh.org/learn-teach/young-naturalist-awards/winning-essays2/2007-winning-essays/lichens-as-indicators-of-vehicle-pollution

http://mason.gmu.edu/~jlawrey/CUE/summary

 

 

11.18.18

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