Pertusaria Group 7

Apothecia present, disciform; ascospores 1 per ascus; on rock or plant debris

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1	Thallus isidiate	2
1a	Thallus not isidiate	8
2	Fatty acids or 5-O-methylhiascic acid present; fumarprotocetraric acid absent	3
2a	Fumarprotocetraric acid present	5
3	Fatty acids present	4
3a	5-O-Methylhiascic acid present; spores 150-200 µm long; on soil or rock; Tas	P. flavoexpansa Kantvilas & Elix
4	On rock; spores 200 µm long; Ireland	P. polythecia (Taylor) Erichs.
4a	On rock; spores 122-183 µm long; Eurasian	P. ocellata Wallr. ex Körb
4b	On plant débris; spores 80-165 µm long; N. hemisphere	P. panyrga (Ach.) Massal
	On moss; spores 80-165 µm long; Ireland	P. hutchinsiae (Borrer) Leight.
5	Isidia well-defined	6
5a	Isidia becoming sorediate; spores 180-200 µm long; France	P. mammosa Harm.
6	Apothecia terminal in isidia; spores 100-270 µm long; circumpolar	P. dactylina (Ach.) Nyl.
6a	Apothecia not terminal in isidia	7
7	Isidia short, blunt, crowded; ?spores; Eur	P. stalactiza Nyl.
7a	Isidia tall, scattered; spores 115-140 µm long; N.Am	P. andersonii Lendemer
8(1a)	Lichexanthone present	9
8a	Lichexanthone absent	14
9a	Picrolichenic acid present	10
9b	Picrolichenic acid absent	11
10	Lichexanthone and picrolichenic acid present; spores 125-180 µm long; N.Am, S.Am	P. ventosa Malme
10a	Lichexanthone, picrolichenic and thamnolic acids present; spores 120-160 µm long; Aus., S.Am	P. subventosa Malme
11	Hypothamnolic acid present; spores 110-160 µm long; S.Am	P. hossei (Räs.) A.W. Archer & Osorio
11a	Hypothamnolic acid absent	12
12	Lecanoric acid present; spores 170-220 µm long; Juan Fernandez [also on wood]	P. skottsbergii Zahlbr.
12a	Lecanoric acid absent	13
13	Haemathamnolic acid present; spores not reported; Brazil	P. xantholeucoides Müll.Arg.
13	Squamatic acid present; spores 100-130 µm long; Socotra	P. xantholeuca Müll. Arg.
14(8a)	Lichen compounds absent; spores 90-140 µm long; Lapland	P. tornensis H.Magn.
14a	Lichen compounds present	15
15	Spores 150-180 µm; K-ve, C-ve [2 unidentified compounds, hplc]; Mexico	P. velata f. liebmannii Vain.
15a	Other compounds present	16
16	Norstictic acid present Stictic acid present; spores 150-193 µm long; China	17 P. weii Q. Ren
16a	Norstictic acid absent	19
17	Norstictic acid only present; spores 100-300 µm long; Eur	P. monogona Nyl.
17a	Norstictic and picrolichenic acids present	18
18	Spores 150-160 µm long [usually 2 per ascus]; disc dull fawn to brown; S.Am.	P. alterimosa Darb.
18a	Spores 100-150 µm long; disc black, white pruinose; Eur.	P. ludovicae Werner
19(16a)	Picrolichenic and protocetraric acids present; spores 180-250 µm long; [rarely on wood]	P. melanochlora (DC) Nyl.
19b	Picrolichenic acid absent	20
20	Thamnolic, cryptothamnolic or hypothamnolic acids present	21
20a	Lecanoric, protocetraric or gyrophoric acids present	23
21	Thamnolic acid present	22
21a	Cryptothamnolic and hypothamnolic acids present; spores 153-204 µm long; China; [also on wood]	P. leptospora Nitschke ex Lahm
22	Spores 95-175 µm long; S.Afr.	P. wawreana A.Massal.
22a	Spores 'ca. 200 µm long' [fide Müll. Arg.]; Eur.	P. clementiana Müll. Arg.
23	Lecanoric or gyrophoric acid present	24
23a	Protocetraric acid present; spores 145-185 µm long; S.Am & NZ	P. macloviana Müll. Arg.
	Spores 135-240 µm long; Arctic Russia	P. cribellata Branth
	Spores 160-180 µm; China	P. setschwanica Zahlbr.
23b	Spores 195-280 µm long; Tasmania	P. parathalassica Kantvilas & Elix
24	Lecanoric acid present	25
24a	Gyrophoric acid present	26
25a	Lecanoric acid only present; spores 100-200(-275) µm long; NZ	P. obvelata Nyl.
	Spores 200-270 µm long; France	P. conglobata (Ach.) Fr.
25a	Lecanoric and variolaric acids present; spores 180-240 µm long; Eur	P. lactea (L.) Arn.
26	Spores 135-150 µm long; S.Am	P. microcarpa Nyl.
26a	Spores 150-230 µm long; circumarctic	P. bryontha (Ach.) Nyl.

Botanic Gardens Trust, Sydney, Australia

Science

Pertusaria Group 7

Apothecia present, disciform; ascospores 1 per ascus; on rock or plant debris