Pertusaria Group 19

Apothecia present, disciform; ascospores 8 per ascus, on rock

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1	4,5-Dichlorolichexanthone and 2-O-methylperlatolic acid present; spores 45-55 µm long; on moss; NZ	P. scottii Elix & A.W. Archer
1a	Depsidones present	2
2	Fumarprotocetraric or salazinic acid present	3
2a	Norstictic or stictic acid present	4
3	Fumarprotocetraric acid present; spores 23-28 µm long; thallus isidiate; Eur	P. oculata (Dickson) Th. Fr.
3a	Salazinic acid present; 24-39 µm long; thallus lacking isidia; Falkland Is.	P. salacinifera Messuti & A.W. Archer
4	Stictic acid present	5
4a	Norstictic acid present	6
5	On moss; spores 80-120 µm long; NZ	P. tyloplaca Nyl.
5a	On rock; spores 25-42 µm long; Eur, N.Am.	P. chiodectonoides Bagl. ex Massal.
6	Spores 18-24 µm long; NZ, S.Am.	P. monticola Messuti & A.W. Archer
6a	Spores 30-40(-47) µm long; S. Hemisphere	P. erubescens (Taylor) Nyl.