5. “The Male Gametophyte of Dacrydium,”
The material used for the mvestigation was collected in New Zealand by the reiewer, and consisted of staminate storbili of Dacrydium biforme, D. Bidwillii, D. cupressinum, D. laxifolium, and young ovules of the two last-named and D. intermedium. No complete series was obtained from any one of the species. At the time of the research the only previous work on the subject was that of Coker in 1902 on Podocarpus coriacea, the gametophytes of the Podocarpineæ being quite unknown. The following is the author's summary of her results:-
There are two prothallial cells cut off from the main body of the spore. In Dacrydium Bidwillii usually only the second divides; m D. laxifolium and D cupressinum both divide.
The generative cell divides by an anticlinal wall, one daughter cell functioning as a body cell, and the other being sterile. In some cases both produce body cells.
The walls of the prothallial cells and the two generative daughter cells disappear.
The mature pollen-grain contains the body cell and five or six free nuclei, according as the first prothallial cell has or has not divided.” L. C.