{Lichenes imperfecti.)
23. ISIDIUM, Ac//.
1. Isidium oculatum, Ach.; Lich. Univ. p. 570. Engl. Bot. t. 1833. Hab. Hermite Island, Cape Horn, the Falkland Islands and Kerguelen's Land ; on the earth. Various Parmelim and Lecanora in a young state, are scarcely distinguishable from one another, and have been referred to Isidium oculatum.
2. Isidium lutescens, Turn, and Borr. Lepraria lutescens, Engl. Bot. t. 1529.
Hab. Kerguelen's Land ; on rocks near the sea.
Very probably a state of Lecanora murorum.
24. LEPRAEIA, Ach.
1. Lepraria fiava, Ach.; Inch. Univ. p. 663. Engl. Bot. t. 1350.
Hab. Hermite Island, Cape Horn, the Falkland Islands and Kerguelen's Land; abundant near the sea.
Evidently the powdery state of some Parmelia, belonging to the citrinous series.
