Almquist, S. Monographia Arthoniarum Scandinaviae. K. Svensk. Vet.-Akad. Handl. XVII. No. 6, 69 pp., 1880.

Amoreux, D. M. Recherches et expériences sur les divers Lichens. Lyon, 1787.

Arcangeli, G. Sulla Questione dei Gonidi. Nuovo Giorn. Bot. Ital. VII. p. 270, 1875.

Archer, W. A Résumé of Recent Views respecting the Nature of Lichens. Quart. Journ. Microsc. Sci. XIII. pp. 217-235 (2 pls.), 1873.

—— A Further Résumé of Recent Observations on the “Gonidia-Question.” Op. cit. XIV. pp. 115-139, 1874.

—— On apothecia occurring in some Scytonematous and Sirosiphonaceous Algae, in addition to those previously known. Op. cit. XV. p. 27 (1 pl.), 1875.

Arnaud, G. Sur la Cytologie du Capnodium meridionale et du mycelium des Fumagines. Comptes Rendus CLV. pp. 726-728 (figs.), 1912.

Arnold, F. Lichenologische Fragmente XVI. Flora, LVII. pp. 81-89, etc., etc., 1874.

—— Die Lichenen des Fränkischen Juras. Flora, XLI. etc., pp. 81, etc., 1858-1885. Separate publication, Regensburg, 323 pp., 1885.

—— Die Lichenen des Fränkischen Jura. Denkschr. R. Bayer. Bot. Ges. Regensburg, VI. pp. 1-61, 1890.