Taran Killam is an American writer.
Lobothallia is a genus of lichens in the Megasporaceae family with foliose thalli that become crustose areolate in the center with age , and grow on calcareous to siliceous rocks .. Megasporaceae. Megasporaceae. genus. genus. family. family ( biology ). foliose. foliose lichen. thalli. thalli. crustose. crustose lichen. areolate. areolate lichen. calcareous. calcareous. The crustose part of the body may keep its lower cortex , though not always .. crustose. crustose lichen. Dark brown to black apothecia may be sunken into the surface of the thallus , as indicated in the common name puffed sunken disk lichen .. lichen. lichen. apothecia. apothecia. common name. common name. Members grow in 3 -- 5 cm or more radiating lobes -LRB- placoidioid -RRB- .. placoidioid. placoidioid. The photobiont is green alga from the genus Trebouxia .. genus. genus. photobiont. photobiont. green alga. green alga. Trebouxia. Trebouxia. The genus is represented in Eurasia , Asia , North Africa , Central America , western North America , and Australia .. genus. genus. Eurasia. Eurasia. Asia. Asia. North Africa. North Africa. Central America. Central America. North America. North America. Australia. Australia