Keys to the macrolichens and checklist of the lichens and ...

49a. Medulla C-, KC+ rose; 3-methoxy-2,4-di-O-methylgyrophoric acid (major).
.........................................................................................Parmelinopsis subfatiscens
49b. Medulla C+ rose, KC+ red; gyrophoric acid (major) ............................................ 50
50a. Lobes narrow, 0.5-2 mm wide; pustules not or rarely sorediate.
.............................................................................................. Parmelinopsis spumosa
50b. Lobes broad, 2-5 mm wide; pustules extensively sorediate.
........................................................................................ Parmelinopsis afrorevoluta
Leioderma Key:
1a. Thallus sorediate .................................................................................. L. sorediatum
1b. Thallus not sorediate...................................................................... L. erythrocarpum
Leprocaulon Key:
1a. Thallus K+ yellow ................................................................................. L. arbuscula
1b. Thallus K- ...................................................................................L. pseudoarbuscula
Leptogium Key:
1a. Lower surface with a thick layer of felty rhizinae ................................................... 2
1b. Lower surface without, or with short or patchy rhizinae......................................... 4
2a. Thallus with isidia.................................................................................. L. asiaticum
2b. Thallus without isidia............................................................................................... 3
3a. Apothecia marginal, convex ...................................................................L. loriforme
3b. Apothecia laminal and concave, or absent........................................ L. pedicellatum
4a. Thallus with isidia.................................................................................................... 5
4b. Thallus without isidia, sometimes with lobules....................................................... 9
5a. Thallus not wrinkled ............................................................................ L. cyanescens
5b. Thallus wrinkled ...................................................................................................... 6
6a. Thallus pale brown, gelatinous ................................................................................ 7
6b. Thallus greyish, thinner ........................................................................................... 8
7a. Thallus lobate, with raised margins ...................................................L. marginellum
7b. Thallus pulvinate to anastomosing....................................................L. coralloideum
8a. Isidia marginal, apothecia numerous .................................................L. marginellum
8b. Isidia laminal, apothecia rare ...................................................L. austroamericanum
9a. Upper surface smooth (stress-wrinkles may occur)............................................... 10
9b. Upper surface wrinkled.......................................................................................... 14
10a. Lower surface pubescent, apothecia with marginal lobes ...................... L. burgessii
10b. Lower surface not pubescent, with or without rhizinae......................................... 11