Abstract
For a number of reasons lichens are highly suitable terrestrial plants in which to interpret seasonal changes in photosynthesis on a mechanistic basis. Because they lack stomata it is possible to control diffusive resistances for CO2 both throughout short-term experiments and seasonally The expression of metabolic rates on a biomass (usually dry weight) basis is not complicated by significant growth during experiments. At least in Peltigera, photorespiration is absent (Coxson et al., 1982; but see Green et al., this volume) and cannot, therefore, be responsible for seasonal changes in net photosynthesis.
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