CONIFERAE 541 



each of which are situated numerous vertical ovules close together. The upwardly- 

 directed scales assist in guiding the pollen, though this is not conveyed to each 

 individual ovule, the separate grains sliding down the inner surface of the scales and 

 falling on the ovules, so that large numbers of these are pollinated at the same time. 



1046. Cryptomeria D. Don. 



3110. C. japonica D. Don. — This species agrees with those of Abietineae. 

 Three vertical ovules are situated at the base of each ovuliferous scale. The pollen- 

 grains are directed straight to them by the scales. 



1047. Taxodium Rich. 



3111. T. heterophyllum Brongn. (= Glyptostrobus heterophyllus Endl.). — 

 This species and those of Taxodineae in general agree with No. 31 10. (Strasburger, 

 op. cit., p. 257.) 



CXXVIII. ORDER CrCADEAE C. RICH. 



1048. Cycas L.' 



3112. C. revoluta L. — Schenck says that all the ovules of this species secrete 

 drops of fluid during anthesis. This characteristic seems therefore to be peculiar to 

 all gymnosperms. (Strasburger, op. cit., p. 257.) 



' Various investigators have described tvfo ciliated spermatozoids as being fonned in the tip of 

 the pollen-tnbe in species of this genus. — Tit. 



