152 Murphy. — The Morphology and Cytology of the 
28 . Pethybridge, G. H.: Further Observations on Phytophthora erythroseptica, Pethyb., and on 
the Disease produced by it in the Potato Plant. Sc. Proc. R. Dublin Soc., vol. xiv, n. s., 
1914, No. 10, pp. 179-98, PL 1. 
29 . -: Recent Advances in our Knowledge of the Genus Phytophthora . Journ. 
Econ. Biol., vol. ix, 1914, pp. 53-63, PI. 2. 
30. Pethybridge, G. II., and Murphy, P. A. : On Pure Cultures of Phytophthora infestans , 
de Bary, and the Development of Oospores. Sc. Proc. R. Dublin Soc., vol. xiii, n. s., 1913, 
No. 36, pp. 566-88, PI. 2. 
31 . Rosenberg, O. : Ueber die Befruchtung von Plasmopara alpma (Johans.). Bihang t. K. Svensk. 
Vet.-Akad. Handlingar, vol. xxviii, 1903, pp. 1-20, PI. 2. 
32 . Ruhland, W. : Sludien liber die Befruchtung der Albugo Lepigoni und einiger Peronosporeen. 
Jahrb. f. wissensch. Bot. (Pringsheim), vol. xxxix, 1904, pp. 135-66, PI. 2. 
33 . Smith, G.: The Haustoria of the Erysipheae. Bot. Gaz., vol. xxix, 1900, pp. 153-84, PL 2. 
34 . Stevens, F. L.: The Compound Oosphere of Albugo Bliti. Bot. Gaz., vol. xxviii, 1899, 
pp. 149-76 and 225-45, PI* 5* 
35 . -— : Gametogenesis and Fertilization in Albugo. Bot. Gaz., vol. xxxii, 1901, 
pp. 77 - 98 , 157-69, and 238-61, PL 4. 
36 -: Studies in the Fertilization of Phycomycetes. Bot. Gaz., vol. xxxiv, 1902, 
pp. 420-5, PL 1. 
37 . - : Oogenesis and Fertilization in Albugo Ipomoeae-Panduranac. Bot. Gaz., 
vol. xxxviii, 1904, pp. 300-2. 
38 . Thaxter, R. : New or Peculiar Aquatic Fungi. 1. Monoblepharis. Bot. Gaz., vol. xx, 1895, 
PP- 433 - 4 °, PI* i* 
39 . Trow, A. H.: Observations on the Biology and Cytology of a New Variety of Achlya americana. 
Ann. Bot., vol. xiii, 1899, pp. 131-79, PL 2. 
40 . -— : Observations on the Biology and Cytology of Pythium ultimum n. sp. Ann. Bot., 
vol. xv, 1901, pp. 269-312, PL 2. 
41 . -: On Fertilization in the Saprolegnieae. Ann. Bot., vol. xviii, 1904, pp. 541-69 
PL 3. 
42 . Wager, H. : On the Fertilization of Peronospora parasitica. Ann. Bot., vol. xiv, 1900, 
pp. 263-79* p L 1. 
43 . Ward, H. M. : Observations on the Genus Pythium , Pringsh. Quart. Journ. Microscop. Sc., 
vol. xxiii, n. s., 1883, pp. 485-515, PL 3. 
44 . Zopf, W. : Zur Morphologie und Biologie der Ancylisteen und Chytridiaceen. Nov. Act. d. 
K. Leop.-Carol. dent. Akad. der Naturforscher, vol. xlvii, 1884, pp. 143-236, Pl. 10. 
EXPLANATION OF PLATES II AND III. 
Illustrating Mr. Murphy’s paper on Sexual Organs of Phytophthora erythroseptica , Pethyb. 
All figures were outlined by means of a camera lucida and the details were filled in afterwards. 
Figs. 1 to 35 inclusive represent a magnification of 1,200 ; Figs. 36 to 49, one of 1,800. 
PLATE II. 
Fig. 1. General view of the sexual organs with a mature spore. Diagrammatic. 
Fig. 2. Entrance of the oogonial incept into the antheridium in longitudinal section. 
Fig. 3. Further view of the same. The male and female organs are borne on separate hyphae. 
Fig. 4. The same in transverse section, (a) A section through the lower part of the antheridium, 
showing the developing female organ inside, (b) A section through the upper part of the same 
antheridium, which the oogonial incept has not yet reached, This is the same stage as is shown 
in Fig. 3 in longitudinal section. 
Fig. 5. The oogonial incept has reached the upper wall of the antheridium and is engaged in 
breaking through it. 
Fig. 6. The piercing of the antheridial wall during the emergence of the oogonial incept. 
