Cytology of a new variety of A chlya americana. 177 
Literature. 
The following list includes the most important papers relating to the subject of 
this communication which have appeared in the last few years. Very complete 
bibliographies of the Saprolegnieae will be found in the papers by Humphrey and 
Hartog. 
Berlese, A.N., *97 : Ueber die Befruchtung und Entwickelung der Oosphare bei 
den Peronosporeen ; Jahrb. f. wiss. Botanik, Bd. xxxi, Heft 2. 
Blackman, Vernon H., ’98 : On the Cytological Features of Fertilization and 
Related Phenomena in Pinus silvestris , L. ; Phil. Trans., B, 1898, vol. cxc, 
pp. 395-426. 
Dixon, Henry H., ’94 : Fertilization of Pinus silvestris ; Annals of Botany, 
Vol. viii, No. XXIX, p. 22. 
Farmer, J. Bretland, and Williams, J. Ll., ’96 : On Fertilization and the 
Segmentation of the Spore in Fucus ; Proceedings of the Royal Society, 
Vol. lx, No. 361, p. 188. 
’98 : Contributions to our Know- 
ledge of the Fucaceae, their Life*history and Cytology ; Phil. Trans., B, 
1898, vol. cxc, pp. 623-645. 
Hartog, M. M., ’95 : On the Cytology of the Vegetative and Reproductive 
Organs of the Saprolegnieae ; Transactions of the Royal Irish Academy, 
Vol. xxx, Part XVII. 
’96 : The Cytology of Saprolegnia ; Annals of Botany, Vol. x, 
No. XXXVII. 
Humphrey, J. E., ’92: The Saprolegniaceae of the United States; read before 
the American Philosophical Society, Nov. 18, 1892. 
Klebs, Georg, ’96 : Ueber die Bedingungen der Fortpflanzung bei einigen 
Algen und Pilzen ; Jena. 
’98 : Zur Physiologie der Fortpflanzung einiger Pilze ; Jahrb. 
f. wiss. Botanik, Bd. xxxii, Heft 1. 
Mitzkewitsch, L., ’98 : Ueber die Kemtheilung bei Spirogyra ; Flora, Band 85, 
Heft 2. 
Strasburger, E., '97 : Cytologische Studien ; Berlin. 
Trow, A. H., '95: The Karyology of Saprolegnia; Annals of Botany, Vol. ix, 
No. XXXVI. 
Zimmermann, A., ’96: Die Morphologie und Physiologie des pflanzlichen 
Zellkernes, p. 132 ; Jena. 
N 
