VI INTRODUCTION. 



SEN'S delimitation should have no true hair, has true unicellular hair; while 

 D. Siebddii (van HOUTTE) O. KTZE, which is taken as another type of the 

 same subgenus, has true multi-cellular hair. I have no doubt, however, that 

 the two just referred to could be quite naturally assigned to the subgenus 

 named, as might be seen from their general characters. With a very few 

 exceptions, Ms delimitation of subgenera and classification of the genus are 

 very natural, and I have, therefore, followed his system solely. 



As to my new species mentioned in this volume, I have described them 

 as accurately and fully as possible and in almost all cases, save where the 

 number of pages or the want of materials forbade, I have supplemented 

 them with figures, in plates or in the text. Accordingly, I believe that any 

 one who is familiar with the plants in question can at once decide whether 

 my species should be recognized, or should be reduced, without taking the 

 trouble to look at my types. As to ferns, I have added to full descriptions 

 photographs of whole forms and magnified sketches of pinnse or pinnules, 

 scales and sori. As a type for description, I have taken the largest form 

 possible ; for describing pinnae or pinnules, I have taken basal ones ; and 

 for angles of pinnae, I have taken the middle ones. Great attention has 

 been paid to venation and the structure of hairs. 



All the species of phanerogamous plants are here arranged, as in the 

 preceding volumes, after the system of BENTHAM and HOOKER, while those 

 of vascular cryptogamia are arranged after the system of ENGLER and PRANTL. 

 The scope of the present volume is the same as that of the preceding 

 volume. 



In conclusion, I avail myself of this opportunity to tender my hearty 

 thanks to the officials of the Government of Formosa to whom I am much 

 indebted for help in the collection of materials and in the publication of 

 this work. 



B. HAYATA. 



August 31, 1914, Taihoku and Tokyo. 



