mogonia of the
Uredines in his memoir, to which we have already alluded.

[B] Oeersted, in "Verhandl der Koenig. Daen. Gesell. Der Wissensch,"
1st January, 1865; De Bary, "Handbuch der Physiol. Botanik"
(1866), p. 172; "Annales des Sci. Nat." (5^me ser.), vol. v.
(1866), p. 366.

[C] Van Tieghem and Le Monnier, in "Annales des Sci. Nat." (1873),
vol. xvii. p. 261.

[D] Brefeld, "Bot. Unt. uber Schimmelpilze," p. 31.

[E] De Bary, "Morphologie und Physiologie der Pilze," cap. 5, p. 160;
"Ann. des Sci. Nat." (1866), p. 343.

[F] Cornu, in "Ann. des Sci. Nat." (5^me ser.), vol. xv. p. 1
(1872).

[G] Pringsheim's "Jahrbucher," vol. ii. p. 169.

[H] De Bary, in "Annales des Sciences Naturelles" (5^me ser.), vol.
v. (1866), p. 343; Hoffmeister's "Handbook" (Fungi), cap. v. p.
155.

[I] De Bary, in "Annales des Sci. Nat." (4^me ser.), vol. xx. p.
129.

[J] De Bary, in "Annales des Sciences Naturelles" (5^me ser.), p.
343.

[K] Woronin, in De Bary's "Beitr. zur. Morph. und Physiol. der
Pilze," ii. (1866), pp. 1-11.

[L] Tulasne, "Ann. des Sci. Nat." (5^me ser.), October, 1866, p.
211.

[M] Tulasne, "On the Phenomena of Copulation in certain Fungi," in
"Ann. des Sci. Nat." (1866), p. 211.

[N] De Bary, "Morphologie und Phys. der Pilze," cap. v., p. 162.

[O] Berkeley, in "Journ. Hort. Soc." vol ii. p. 107; Tulasne, "Ann.
d. Sc. Nat." (4^me ser.), vol. ii. tab. 12.

[P] Tulasne, "New Researches on the Reproductive Apparatus of Fungi;"
"Comptes Rendus," vol. xxxv. (1852), p. 841.

[Q] De Bary, "Morphologie und Physiologie der Pilze," cap. v. p.
168.

IX.

POLYMORPHISM.

A great number of very interesting facts have during late years been
brought to light of the different forms which fungi assume in the
course of their development. At the same time, we fear that a great
many assumptions have been accepted for fact, and supposed connections
and relations between two or three or more so-called species,
belonging to different genera, have upon insufficient data been
regarded as so many states or conditions of one and the same plant.
Had the very pertinent suggestions of Professor de Bary been more
generally acted upon, these suspicions would have been baseless. His
observations are so valuable as a caution, that we cannot forbear
prefa