16 E. M. Cutting 
(29) Kniep, H. Beitrage zur Kenntnis der Hymenomyceten. I, 11. Zeitsch. 
fur Bot. 5 , pp. 593 - 637 - 1913- 
( 3 °) - Beitrage zur Kenntnis der Hymenomyceten. Zeitsch. fur Bot. 7 , 
PP- 369 - 398 . 1915- 
(31) - Beitrage zur Kenntnis der Hymenomyceten. Zeitsch. fur Bot. 8, 
p. 352. 1916. 
(32) Levine, M. Studies in the Cytology of the Hymenomycetes. Bull. Torr. 
Bot. Club, 11, pp. 137-181. 1913. 
(33) - The Life-history and Sexuality of the Hymenomycetes. (Review.) 
Bot. Gaz. 18 , p. 67. 1919. 
(34) Moreau, F. Sur la Reproduction sexuelle de Zygorhynchus Moelleri Vuill. 
Compt. Rend. Soc. de Biol. 78 , pp. 14-15. 1912. 
(35) Murphy, P. A. The Morpholog}^ and Cytology of the sexual organs of 
Phytophthora erythro-septica Pethyb. Ann. Bot. 32 . 1918. 
(36) Nichols, S. P. The nature and origin of the binucleated cells in some 
Basidiomycetes. Trans. Wisconsin Acad, of Sciences, 15 , p. 30. 1904. 
(37) Ramsbottom, J. Recent published Results on the Cytology of Fungus 
Reproduction. Trans. Brit. My col. Soc. 1911, 1912, 1913. 
(38) Shantz, H. L. and Piemeisel, R. L. Fungus Fairy rings in Eastern 
Colorado and their effect on vegetation. Jour. Agric. Research, 11. 1917. 
(39) Shear, C. L. and Wood, A. K. “Studies of Fungus Parasites belonging 
to the genus Glomerella .” U.S. Dept. Agric. Bur. of Plant Industry, Bull. 
252. 1913. 
(40) Smith, A. Lorrain. Sexuality in the Basidiomycetes. (A review of 
Miss Bensaude's (3) paper.) Journ. Royal Micros. Soc. p. 617. 1917. 
(41) -Sexuality in the Basidiomycetes. (A review of Miss Bensaude’s 
Thesis.) Journ. Royal Micros. Soc. 1920. 
(42) Taubenhaus, J. J. Recent Studies on Sclerotium rolfsii Sacc. Jour. 
Agric. Research, 18 . 1919. 
(43) Welsford, E. J. Fertilization in A scobolus furfur ace us. New Phytologist, 
6. 1907. 
(44) Wollenweber, H. W. Identification of species of Fusarium occurring 
on the Sweet Potato. Jour. Agric. Research, 2. 1914. 
POSTSCRIPT 
Since the above was written an important summary of non- 
cytological work on the sex of the Mucorineae by Namyslowski has 
appeared in the Revue Generate de Botanique (May 1920). Amongst 
other interesting facts, our attention is drawn to the opinion, which 
seems to be growing prevalent, that a series of transitions exist 
between homothallic and heterothallic forms, and that external 
conditions greatly modify the character of the method of repro¬ 
duction. Burger’s results on Cunninghamella and the behaviour, 
reported by Edgerton, of the ascomycete Glomerella , are in keeping 
with this view, but not with that originally put forward by Blakeslee. 
It will be evident, moreover, from a general knowledge of plant 
physiology that the phenomena of “ Zygotactism ” and of “Hapto- 
morphism ” may be expected to vary much with external conditions, 
and the latter ma}^ indeed prove to be replaceable by some other 
stimulus. 
