1901] GAMETOGENESIS AND FERTILIZATION IN ALBUGO 261 
PLATE IV, Teratological forms from various Shay (X 1366 or 857, and slightly reduced tn 
reproduction). 
1G. 43. Antheridial tube penetrating oogonium in which no oosphere 
has been differentiated; tube branched and heavily coated with pectin; 
pectin also on oogonial wall in neighborhood of antheridium. A. 7ragofo- 
gonts, 
1G. 44. Oogonium in which no oosphere was developed; antheridial 
tube small; deposit of pectin on oogonial wall in neighborhood of antherid- 
ium ; also isolated pectin deposits, presumably in vacuoles; large deposit on 
the remains of the antheridial tube. A. Portudacae. 
IG. 45. An oogonium similar to that shown in fig. gg, two antheridia in 
contact with an oogonium; deposits of pectin lining the walls and projecting 
into the oogonium in the neighborhood of the antheridium ; isolated balls of 
pectin lying free in the oogonium. <A. Portulacae. 
1G. 46. An oogonium which developed no oosphere; masses of charac- 
teristic pectin distributed through the oogonium; deposits of pectin on the 
ee wall adjacent to the antheridium. A. Portulacae. 
47. Teratological formation of inner wall; redrawn from sketch, 
elas di edicte siti. A. Bliti 
G. 48. Antheridial tube lying against plasmoderma of an oosphere fer- 
tilized by another antheridium ; oosphere showing five nuclei in this section ; 
antheridial nuclei in dense cytoplasm in the extreme tip of the tube; pectin 
formation encasing both oosphere and the end of the tube of the supernu- 
merary antheridium. <A. Portulacae. 
IG. 49. Similar to fig. g8, an older condition, showing whole structure 
Surrounded by the remains of oogonial wall. A. Portulacae. 
1G. 50. Antheridial tube opening into an oogonium which has devel- 
oped no oosphere; many male nuclei passing out, tube cut slightly oblique. 
A. Portulacae. 
IG. 51. Two antheridial tubes, each bearing many nuclei, opening 
simultaneously into one oosphere; one in transverse, one in longitudinal sec- 
tion. Z 
Fig. Sz. Cieohete fully differentiated and devoid of nuclei; antheridial 
tube astray in periplasm; periplasm and antheridium normal. A. Biiti. 
1G. 53. An oogonium containing two coenocentra; oosphere bilobed, 
one coenocentrum lying at the center of each lobe; metaphase similar to fg. 
26. A. Tragopogonis. 
