Pertusaria Group 15

Apothecia present, verruciform; ascospores 4 per ascus, smooth; on rock or moss

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1	Chlorinated xanthones present	9
1a	Chlorinated xanthones absent	2
2	2-Chlorolichexanthone, stictic and 2-O-methylsuperlatolic acids present; spores 108-125 µm long; PNG	P. aptrootii A.W. Archer & Elix
2a	4,5-Dichlorolichexanthone or 4-chlorolichexanthone present	3
3	4,5-Dichlorolichexanthone present	4
3a	4-Chlorolichexanthone present; spores 100-120 µm long; Antarctic, Marion Is.	[? not published] 'P. gremmenii Øvstd.'
4	On moss	5
4a	On rock	7
5	4,5-Dichlorolichexanthone, stictic and 2-O-methylperlatolic acids present; spores 140-175 µm long; S.Am.	P. tapadensis Elix & A.W. Archer
5a	4,5-Dichlorolichexanthone and stictic acid present	6
6	Spores 93-104 µm long; Japan, China	P. quartans Nyl.
6a	Spores 42-96 µm long; Arctic	P. trochisea Norm.
7(4a)	4,5-Dichlorolichexanthone only present; spores 2-4 per ascus, 70-90 µm long; Cape Verde Is	P. aleianta Nyl.
7a	Stictic or norstictic acids present	8
8	4,5-Dichlorolichexanthone and stictic acid present; spores 80-105 µm long; Aus.	P. trevethensis A.W. Archer
8a	4,5-Dichlorolichexanthone and norstictic acid present; spores 80-90 µm long; S.Am	P. rudecta Müll. Arg.
9(1a)	On moss; norstictic acid present; spores 50-180 µm long; circumpolar	P. glomerata (Ach.) Schaer.
	On moss and rock; [also 2,3 or 5/ascus]; polar	P. alaskensis Erichs.
	Spores (1-)2(-3); also on wood; N.Am, arctic	P. subobducens Nyl.
9a	On rock	10
10	2-O-Methylperlatolic or confluentic acid present	11
10a	Norstictic or stictic acids present	12
11	2-O-Methylperlatolic acid present; spores 145-185 µm long; S.Am.	P. spegazzinii Müll. Arg.
11a	Confluentic acid present; spores 108-130 µm long; S.Am	P. malvinae Messuti & A.W. Archer
12	Norstictic acid present	13
12a	Stictic acid and lichexanthone present; spores 70-85 µm long; Central Afr.	P. rhodesica Vain.
13	Spores 55-75 µm long; Mauritius	P. hymenelioides J.C. David
13a	Spores 60-90 µm long; NZ	P. graphica C. Knight

Botanic Gardens Trust, Sydney, Australia

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Pertusaria Group 15

Apothecia present, verruciform; ascospores 4 per ascus, smooth; on rock or moss