Lepraria lobificans Nyl.

    Thallus leprose, granules to 0.2-0.5 mm diam., soft, covered with minute erect hyphae producing (under magnifying lens) a cottony appearance, more or less thick, soft, spongy, margin more or less delimited, apparently lobate but often resricted to scarce scattered granules; pale blue-greenish, pale grey-greenish, some sections paler, notably towards the margin due to white medulla. Fertile specimen unknown. Photobiont: green algae. C-, K- or K+ pale yellow, Pd+ orange. Rather common, on various types of substrata: walls, acid rocks, acid bark of trees, etc. always in humid areas, shaded and protected from direct rainfalls. See Botryolepraria lesdainii which is rather similar but Pd-.*