LIBRART 

 NEW YORK 



botanicai 



The Development of the Gametophytes and 

 Embryogeny in Cunninghamia sinensis'). 



By 



Kiichi Miyake. 



With Plates I— V and 2 Figures in the Text. 



Eecent embryological studies of Ai-noldi, Coker and Lawson 

 have shown quite conclusively that the famity Taxodieae is not at 

 all a natural group, and that the present Classification of the Co- 

 niferae, so far as this group is concerned, should be entirely re- 

 arranged. Arno kl i (1900) has already suggested that, of the 

 genera of this family, Taxodium, Cryptomeria and perhaps also 

 Curminghamia^), should be united with the Cupressineae and that 

 Sequoia and Sciadojntys should each constitute a family by itself. 

 This Suggestion, being followed by Coker (1903) and Lawson 

 (1904), seems to be well founded. But before making any de- 

 finite new arrangement of the group, it is very desirable that the 

 life-history of all the genera should be thoroughly worked out. 



Of eight genera 3) belonging to the Taxodieae, we have only 

 the fairly coniplete embryological records of three, namely those 

 of Sequoia (Shaw, 1896; Lawson, 1904 a), Taxodium (Coker, 

 1903) and Cryptomeria (Lawson, 1904b). Our knowledge about 

 the life-history of the genus Oimnimghamia is very meager, being 

 based entirely on the fragmentary records of Arnoldi (1900) who 

 has studied the genus incidentally, with insufficient material, in 

 his comparative investigations of the Taxodieae. The present work 

 was begun in the summer of 1905 with the hope of hlling up the 



*) A preliminary note was published in Bot. Mag. Tokyo. Vol. 22. 

 (Miyake, 1908.) 



^) He was not quite sure about Cnnninghamia as the following statement 

 shows: „Es wird also nach meiner Meinung die von Eichler als Pinoideae- 

 Abietineae-Taxodiinae bezeichnete Gruppe in drei Familien geteilt. Die 

 erste Familie Sequoiaceae — enthält zwei Gattungen: Sequoia and Welling- 

 j^ tonia; Taxodimn und Crijptomeria^ vielleicht auch Cunninghamia ('^), werden 

 mit den Cupressineen vereinigt; Sciadopitys wird am besten als Repräsentant 

 einer eigenen Familie Sciadopiteae — bezeichnet." (Arnoldi, 1900, p. 23.) 



^) Seven genera have hitherto been included in the Taxodieae, and an 

 another genus Taiwania was recently established by Hayata (1906) basing 

 on a new Conifer from Formosa. 



Beihefte Bot. Centralbl. Bd. XXVII. Abt. I. Heft 1. 1 



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