—— A Monograph of Lichens found in Britain, I. London, 1894.
Culpepper, Nicolas. The English Physician, etc. London, 1652.
Cunningham, D. D. On Mycoidea parasitica, a new genus of Parasitic Algae and the Part which it plays in the Formation of certain Lichens. Trans. Linn. Soc. Ser. 2, I. p. 301 (1 pl.), 1879.
Cutting, E. M. On the Sexuality and Development of the Ascocarp in Ascophanus carneus Pers. Ann. Bot. XXIII. pp. 399-417 (1 pl.), 1909.
Czapek, Friedrich. Biochemie der Pflanzen. 2 vols. Jena, 1905.
Dangeard, P. A. Recherches sur la structure des Lichens. Le Botaniste, Sér. 4, fasc. 1 and 2, 1894.
—— La Reproduction sexuelle des Ascomycètes. Tom. cit. pp. 21-58 (figs.), 1894.
Danilov, A. N. Ueber das gegenseitige Verhältnis zwischen den Gonidien und dem Pilzkomponenten in der Flechtensymbiose. Bull. Jard. Imp. Bot. St Pétersbourg, X. pp. 34-66 (German Résumé, pp. 66-70), (3 pls.). 1910.
Darbishire, O. V. Kritische Bemerkungen über das Microgonidium. Hedwigia, XXXIV. pp. 181-190, 1895.
—— Dendrographa, eine neue Flechtengattung. Ber. Deutsch. Bot. Ges. XIII. pp. 313-326 (1 pl.), 1895².