512 Ber ridge. — Fertilization in Ephedra altissima. 
Both gametes enter the egg-cell, but no cytoplasm was observed to 
pass with the first sperm to the egg nucleus. The first male gamete is 
very small, round, and densely granular ; it applies itself to’ the pointed 
end of the egg nucleus, which is directed to the neck of the archegonium. 
A zone of radiating strands of cytoplasm appears round the fusion nucleus. 
The nuclei of the jacket cells divide once, and then die after fertilization 
is accomplished. 
EXPLANATION OF FIGURES IN PLATE XXXVI. 
Illustrating Miss Berridge’s paper on Ephedra altissima. 
Abbreviations. — ar. egg-cell of archegonium; n. neck-cell; p.t. pollen-tube; m v first male 
gamete ; m 2 . second male gamete ; t. tube nucleus ; s. stalk-cell ; e. egg nucleus ; v. c. ventral-canal 
nucleus. 
Fig. i. The nucleus of the central cell undergoing division, x 375. 
Fig. 2. Male gametophyte of E. distachya escaping from the exine of the pollen-grain, x 1000. 
Fig. 3 a. Commencement of pollen-tube in E. altissima. x 1000. 
Fig. 3 b. Older pollen-tube with male gametes and tube nucleus. The full length of the pollen- 
tube is not represented, x 580. 
Fig. 4. Tip of the pollen-tube fused with the wall ( w ) of the egg-cell, x 1000. 
Fig. 5. Fusion of first male gamete and egg nucleus, x 320. 
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