[H] Mr. Berkeley has lately published a species under the name of _P. Ellisii_, in which the gelatinous element is scarcely discernible till the plant is moistened. There are two septa in this species, and another species or form has lately been received from Mr. Ellis which has much shorter pedicels, and resembles more closely _Puccinia_, from which it is chiefly distinguished by its revivescent character. [I] Von Waldheim, on the "Development of the Ustilagineæ," in "Pringsheim's Jahrbucher," vol. vii. (1869); translated in "Transactions of N. Y. State Agricultural Society for 1870." [J] Berkeley, on the "Propagation of Bunt," in "Trans. Hort. Soc. London," ii. (1847), p. 113; Tulasne, second memoir, in "Ann. des. Sci. Nat." ii. (4^me sér.), p. 77; Cooke, in "Journ. Quekett Micro. Club," i. p. 170. [K] De Bary, "Recherches," &c. in "Annales des Sciences Naturelles" (4^me sér.), xx. p. 5; Cooke in "Pop. Sci. Rev." iii. (1864), p. 459. [L] This is the mould which produces the potato murrain. [M] De Bary, "Champignons parasitiques," in "Annales des Sci. Nat." (4^me sér.), xx. p. 5; Cooke, "Microscopic Fungi," cap. xi. p. 138; "Popular Science Review," iii. 193 (1864). [N] Van Tieghem and Le Monnier, "Researches on Mucorini," in "Ann. des Sci. Nat." (1873), xvii. p. 261; Summary in "Quart. Journ. Micro. Science" (2nd ser.), xiv. p. 49. [O] Seynes, "Essai d'une Flore Mycologique." [P] Boudier, "Mémoire sur l'Ascoboles," pt. i. iv. f. 13-15. [Q] Coemans, "Spicilége Mycologique," i. p. 6. [R] Woronin, "Abhandlungen der Senchenbergischen Naturfor. Gesellschaft" (1865), p. 333. [S] In the very important observations made by Dr. Cunningham at Calcutta, on substances floating in the atmosphere, it appeared that the sporidia of many _Sphæriæ_ actually germinated after being taken up by the air. The multitude of fungus spores which were observed in every case was quite extraordinary. VIII. SEXUAL REPRODUCTION.