Pseudocyphellae and Pored Epicortex in the Parmeliaceae: Their Delimitation and Evolutionary Significance

M. E. Hale

doi:10.1017/S0024282981000030

Abstract

The origin and development of pseudocyphellae and the pored epicortex are compared. Pseudocyphellae are pores through the paraplectenchymatous cortex which fill with medullary hyphae. The pored epicortex is a thin, perforated polysaccharide sheet lying over a loosely organized cortical layer. Both structures function in gas exchange and may represent two different phyletic lines.

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Pseudocyphellae and Pored Epicortex in the Parmeliaceae: Their Delimitation and Evolutionary Significance

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Pseudocyphellae and Pored Epicortex in the Parmeliaceae: Their Delimitation and Evolutionary Significance

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